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The Right of Access to Port and the Impact of Historic Fishing Rights

DILA’s 2020 International Conference theme, “Reshaping International Law in the Asian Century”, does not necessitate the challenging or subversion of established norms. Reshaping may equally occur by reflecting on overlapping fragments of international law that were previously only analyzed in silos. This article identifies a previously overlooked contribution to international law by taking historic fishing rights, a predominantly regional or bilateral custom, and assessing the extent to which it refines the lack of customary law rights for vessels to access foreign ports, an established global norm of international law. This article therefore first proceeds with section 2 charting the lack of any general right of access to foreign ports in the law of the sea. The only widely accepted customary law exception concerns vessels in distress, or a situation of force majeure, where access to port is necessary to preserve human life. Section 3 then introduces the contemporary scope of historic fishing rights, and, more specifically, the recognition of associated rights in the Eritrea/ Yemen – Sovereignty and Maritime Delimitation in the Red Sea Award Stage II (Eritrea/Yemen Award).1 The explicit example of an associated right of access to port for historic fishers necessitates a refinement of the findings in section 2. The conclusion shall place this exceptional right of entry within its wider international law context, namely as an affirmative example of bilateral customary international law.2 Finally, this article concerns the practice of international courts and tribunals in conceptually recognizing a historic fisher’s associated right of access to a port in the law of the sea. This article does not provide an exhaustive account of historic fishing regimes in which an associated access right could apply.


Introduction
DILA's 2020 International Conference theme, "Reshaping International Law in the Asian Century", does not necessitate the challenging or subversion of established norms. Reshaping may equally occur by reflecting on overlapping fragments of international law that were previously only analyzed in silos. This article identifies a previously overlooked contribution to international law by taking historic fishing rights, a predominantly regional or bilateral custom, and assessing the extent to which it refines the lack of customary law rights for vessels to access foreign ports, an established global norm of international law.
This article therefore first proceeds with section 2 charting the lack of any general right of access to foreign ports in the law of the sea. The only widely accepted customary law exception concerns vessels in distress, or a situation of force majeure, where access to port is necessary to preserve human life. Section 3 then introduces the contemporary scope of historic fishing rights, and, more specifically, the recognition of associated rights in the Eritrea/ Yemen -Sovereignty and Maritime Delimitation in the Red Sea Award Stage II (Eritrea/Yemen Award).1 The explicit example of an associated right of access to port for historic fishers necessitates a refinement of the findings in section 2. The conclusion shall place this exceptional right of entry within its wider international law context, namely as an affirmative example of bilateral customary international law.2 Finally, this article concerns the practice of international courts and tribunals in conceptually recognizing a historic fisher's associated right of access to a port in the law of the sea. This article does not provide an exhaustive account of historic fishing regimes in which an associated access right could apply.
Further refinements beyond the focus of this article may also apply, such as international trade law or health regulations.3

Foreign Vessels Access to Port in the International Law of the Sea4
A foreign vessel's right of access to port would operate as a limitation to the otherwise applicable port state's jurisdiction. A port state is a state exercising jurisdiction over a foreign vessel visiting its port. Analyzing access rights therefore first requires reviewing what 'port' encapsulates, as well as the port state jurisdiction potentially affected.

2.1
Ports In common parlance, ports are defined by synonyms or common features, such as a harbor, wharf, or seaport. Fishing ports are more diverse, sometimes lacking any port facilities normally associated with shipping. For example, fishing ports would include beach landing areas. The United Nations Convention on the Law of the Sea (UNCLOS) refers to ports without definition.5 The Agreement on Port State Measures to Prevent, Deter and Eliminate Illegal, Unreported and Unregulated Fishing (PSMA) defines ports as including analogous "offshore terminals and other installations"6 where port services are available. Ports are thus simply locations equipped to enable vessels to visit a state and/or access port services. This definition is without prejudice to the existence of any specific infrastructure or port services.
For international lawyers this broad definition is sufficient. The term port in "access to port" or "port state jurisdiction" identifies the state with rights, responsibilities, and limitations concerning the exercise of jurisdiction. In international trade law ports are comparable to land-based ports of entry.7 Concerning the law of the sea, ports "form a convenient point at which to exercise control over [visiting] vessels".8 Ports are not a distinct maritime zone.9 Many ports are located in closed bays or rivers that are landward of the baselines used to measure the breadth of the territorial sea.10 Internal waters are those waters landward "of the baseline of the territorial sea".11 A port's infrastructure may extend out to sea, in which case the "outermost permanent harbor works which form an integral part of the harbor system are regarded as forming part of the coast".12 This will impact the drawing of baselines and therefore the delineation of a coastal state's maritime zones.13 The PSMA likewise refers to a state's territory as including its ports.14 Ports (and foreign vessels therein) are therefore often located in a state's territory or internal waters.15 A coastal state has sovereignty over its internal waters comparable to that exercised over its land territory. 16 Ports may also be located in the territorial sea and archipelagic waters.17 The territorial sea actually extends to roadsteads that would otherwise be wholly or partially located beyond the outer limits of the territorial sea.18 A coastal state's sovereignty, subject to UNCLOS and other pertinent international law, extends to the territorial sea and archipelagic waters. 19 Finally, UNCLOS recognizes offshore loading and unloading points for exploration or exploitation of the exclusive economic zone (EEZ) and continental shelf.20 These offshore points, as well as other exceptional deep-water ports in the EEZ or the high seas, are not used in historic fisheries. Nevertheless, the port state will limit the entry of vessels to those flag states for which a relevant bilateral arrangement on access and jurisdiction exists. Bilateral agreements between flag states and the USA provide the USA with treaty-based port state jurisdiction for its extraterritorial ports analogous to that exercised over territorial ports.21

Port State Prescriptive Jurisdiction on Port Entry
A port state's prescriptive jurisdiction may be separated into two strands, namely; (1) the regulation of access to port and port services (e.g. landing, transshipping, packaging, processing, refueling, resupplying, maintenance, and drydocking), and; (2) the regulation of port offenses and other exercises of state jurisdiction in international law (e.g. territorial jurisdiction, protective jurisdiction or treaty-based jurisdiction).
This article concerns the regulation of access to port and port services which is best seen as a domaine réservé exception to the law of state jurisdiction.22 Contemporary port state practice on access, while universally accepted as legal among states, does not follow the nexus-based approach of state jurisdiction in international law. Port entry conditions may be prescribed concerning conduct wherever and whenever it occurs. This includes imposing conditions of extraterritorial conduct with no nexus to the port state, let alone a sufficient nexus to fulfill the requirements of applying the principles of objective or subjective territorial jurisdiction. This is analogous to the legal basis for prescribing conditions of entry for foreign nationals entering a state.23 20 Id reaffirm the right to deny entry to a port. Within fisheries law, port entry conditions may concern the manner of high seas fishing conducted by foreign vessels. For example, entry conditions may address whether the vessel's conduct is deemed by the port state to have undermined a conservation and management measure of a Regional Fisheries Management Organization or Arrangement (RFMO/A), or is deemed illegal, unreported, or unregulated (IUU) fishing.34 mean crossing borders without complying with the necessary requirements for legal entry into the receiving State"). 24 International The customary law breadth and basis of port state discretion over entry are evident in the lack of any treaty-based jurisdiction within these instruments, as well as their application to non-contracting parties' vessels where flag state consent is absent. Port state control regimes equally apply instruments to visiting vessels regardless their flag state or ratification status.35

Port State Enforcement Jurisdiction on Port Entry
The exceptional domaine réservé-based right to regulate access to port and port services is, in turn, limited in its enforcement to the denial of access to port or port services. The denial of entry to port or the denial of port services is seen as an enforcement measure.36 Other enforcement measures, such as fines, imprisonment, or confiscation of catch and vessel would not fall within this domaine réservé exception and are thus reserved for validly prescribed port state offense (strand (2) in subsection 2.2 above).37 While the scope of a coastal state's enforcement jurisdiction significantly differs depending on the maritime zone in which enforcement occurs, a port state's enforcement jurisdiction is largely consistent regardless of where the port is located. Within internal waters, no general right of navigation exists which would limit port state jurisdiction.38 Within other maritime zones, the navigation rights that limit coastal state enforcement are inapplicable once the vessel requests entry into port or enters a port therein.39 Outside of the port limits, an inbound foreign vessel may exercise innocent passage in the territorial sea. However, this is subject to the coastal state's measures necessary to enforce its conditions of port entry.40 If it is demonstrable that a vessel is proceeding to port and a coastal state's measures are necessary and preventative, the vessel may be treated as "akin to vessels engaged in noninnocent passage" for the purposes of enforcement.41 Concerning outbound vessels, enforcement jurisdiction remains at the coastal state's discretion.42 For example, vessels violating port state measures could be subject to hot pursuit and enforcement measures at sea.43

Access to Port by Foreign Vessels
The finding that a port state has an exceptional domaine réservé-based right to condition and deny access to port provides an unlimited jurisdictional basis in international law. However, beyond establishing a valid legal basis, a port state must also comply with any other obligations assumed under international law which may limit the scope and exercise of its jurisdiction. Where the law of the sea provides foreign vessels with a right of entry into port, the corresponding obligation upon port states would limit port state jurisdiction. An otherwise legal basis to deny access to port may also be legally constrained

A General Right of Entry to Port
Prescribed port entry conditions would be unenforceable through denial of entry if said denial conflicts with a foreign vessel's right of access. Historically, a right of port entry was the subject of a lively debate.46 Commentators and state practice have largely concluded no such general right exists.47 Indeed, in fisheries law quite the opposite is apparent. Port states party to PSMA are obliged to deny a foreign fishing vessel access to port if sufficient evidence suggests the vessel has engaged in IUU fishing or fishing-related activities in support of IUU fishing.48 In fisheries law the debate on access occasionally resurfaces. In 2016 a proposal sought to amend an RFMO Conservation Measure by exempting certain vessels from submitting documentation as a port entry requirement. This was based upon the "right of a vessel to peaceful entry into port is enshrined in international maritime law".49 Other states disagreed and the proposal failed to gain support.50 Equally unsuccessful have been attempts in domestic courts 46 See to challenge the legality of port state measures by arguing an international lawbased right to port access.51 In short, even the presumption of access being granted for peaceful and compliant merchant vessels does not extend to fishing vessels.52 In 1958, an arbitral tribunal had reasoned that "[a]ccording to a great principle of public international law, the ports of every State must be open to foreign merchant vessels and can only be closed when the vital interest of the State so require".53 This reasoning has however been overtaken by contrary practice,54 and in any event, did not stand for a general right.55 Likewise, the Convention and Statute on the International Régime of Maritime Ports, while sometimes argued as providing a right of port entry, neither represents customary law nor provides a right of entry for contracting parties.56 In any event, fishing vessels were excluded from the reciprocity provided.57 Fishing vessels are also often excluded or further qualified in bilateral access agreements,58 most recently including the EU/UK Trade And Cooperation Agreement.59 Indeed, a vast collection of bilateral access agreements would be superfluous if a general right to port entry existed.60 As treaty-based rights of entry for foreign vessels are a derogation from the port state's rights, the scope of the rights conferred will be restrictively interpreted to only include the classification of vessel, such as merchant vessels or warships, which are clearly identified.61 Further contemporary practice accepts the legality of closing ports to foreign vessels unless, as occurred with Ukraine's 2014 closure of five ports located in Russian-controlled Crimea, a dispute over territorial sovereignty exists.62 The recent Arctic Science Agreement promotes territorial and port access, but via soft commitments of facilitating access through "best efforts".63 This non-binding language, similar to that seen in FAL,64 once again highlights the lack of port access rights. by Contracting Parties, including access to port.66 However, free pratique is limited to not refusing permission to enter port "for public health reasons" and may still be subject to conditions of entry or specified ports.67 Additional health measures, including denial of entry, may apply in response to "specific public health risks or public health emergencies of international concern".68 The COVID-19 pandemic and the response of many port states to prohibit or severely restrict access have demonstrated the lack of any general right of port access.69 Technological innovations and automation in shipping may result in further restrictions on access to a port, be it to promote a transition to marine autonomous surface ships (MASS) or because future autonomous ports may be ill-equipped to address non-MASS vessels. This customary law right of entry to port is recognized in soft law instruments, such as the International Plan of Action to Prevent, Deter, and Eliminate Illegal, Unreported and Unregulated Fishing (IPOA-IUU).72 It is vicariously recognized in treaties, such as PSMA, which would, but for the situation of force majeure or distress, impose obligations upon port states to deny access.73 Other instruments also implicitly recognize this exceptional right of entry by limiting the port states' obligations to vessels "voluntarily in port".74 Similarly, treaties that promote compliance with international standards through port state control will often exempt those vessels in port due to distress or force majeure.75 This exception will limit the port state's right to deny entry, although a place of refuge will not normally require port entry but rather a sheltered area along the coastline.76 Requests for access to a place of refuge may arise in other contexts, such as a situation presenting an environmental hazard,77 or economic considerations, such as the otherwise total loss of an abandoned vessel and cargo.78 However, in such cases there is no obligation under international law for the coastal state to grant permission to enter a place of refuge, nor are places of refuge necessarily a port.79 Of course, states remain at liberty to grant broader rights of entry into port for vessels in distress than their customary law obligations require. For example, the Convention concerning Fishing in the Black Sea provided Contracting Parties' vessels with access to designated ports of refuge "to shelter from bad weather or in case of damage".80 The port/coastal state evaluating the necessity of shelter for the preservation of human life will balance the interests raised by the vessel's circumstances against its own interests.81 When granting humanitarian access further entry conditions may therefore be applied,82 although illegal activity alone cannot be grounds for denial of entry.83 A common example would be imposing financial security conditions for entry.84 Decisions about the necessity of entry, or lack thereof, should be based on objective facts as balanced against the port state's interests. 85 Essentially, port states should exercise due diligence in reviewing, on a case-by-case basis, whether an entry right applies.86 The port state determines whether force majeure or distress is demonstrated,87 which domestic interests are threatened, the weight to be given to competing interests, and any decision upon entry and upon what conditions. For vessels granted an exceptional right of access to port and acting in full compliance with the condition of entry imposed, the port services they can access are similarly limited. Subject to availability, the port state is obligated to provide access to port services see also Schatz & Fantinato, supra note 45, at 761-64, 768-69 (indicating that domestic law may also exclude criminal liability for breaching orders denying port entry Proelss, supra note 71, at 25. essential to preserving health and safety.88 Beyond this, services are provided at the discretion of the port state.
In the near future, the right of refuge may need to adapt to forthcoming technological revolutions. As Chircop highlights, unmanned vessels will trigger distress cases threatening serious transboundary environmental or economic damage, but without raising humanitarian concerns.89 A right of entry in distress should necessarily either evolve to address these primarily environmental concerns, or simply fade away as remote operators move ashore and humanitarian concerns disappear.

2.5
Sub-Conclusion It was seen that the jurisdiction to regulate access to port was legally valid without recourse to the principles of state jurisdiction. Port states have an exceptional domaine réservé-based jurisdiction to prescribe conditions of entry and enforce these through denial of access (subsections 2.1-2.3)). Within the law of the sea, the principal restriction on this jurisdiction is those rare cases where a vessel in distress, or compelled by force majeure, requires access to a port in order to preserve human life. In such cases, a port state may condition but not outright prohibit port entry and may condition but not outright prohibit access to port services that are essential to the health and safety of the crew and passengers (subsection 2.4).
A right of port entry, therefore, limits the port state's jurisdiction on port entry and services. However, this right may also impact the wider port state jurisdiction to enforce offenses utilising a port state nexus. Certain laws are inapplicable when force majeure or distress entry occurs.90 While the scope of this limitation is unsettled, inapplicable laws would include those "in connection with actions to relieve the distress".91 Rules closely tied to voluntarily entering a state, such as customs law, are inapplicable to vessels in port due 88 PSMA, supra note 6, arts. 10, 11(2)(a), 18(2 to force majeure or distress.92 Enforcement of treaty-based jurisdiction under Article 218 of UNCLOS is limited by a requirement, among others, that proceedings may only be instituted "[w]hen a vessel is voluntarily within a port or at an off-shore terminal".93 Beyond these limited cases of offenses closely tied to entry or treaty-based port state jurisdiction, comity may discourage the enforcement of port state laws but port states are not limited as a matter of international law.94

Historic Fishing Rights and Associated Rights
Much like port state jurisdiction discussed above, the law on the acquisition and limits of historic fishing rights is found outside of UNCLOS and within the residual general international law.95 As this article proposes that a second exceptional customary right of access to port can be found in the doctrine of historic fishing rights, and an overview of contemporary historic fishing rights is necessary for context and scope.

3.1
Historic Fishing Rights96 UNCLOS explicitly recognizes several regimes of historic waters.97 Historic waters involve "claims of sovereignty over maritime areas derived from historical circumstances".98 Alternatively, and significantly narrower, UNCLOS establishes treaty-based "traditional fishing rights" in archipelagic waters which were formally high seas, while historic fishing rights in archipelagic waters which were formally territorial seas are preserved.99 No historic fishing access rights in the EEZ are provided. Coastal states have exclusive jurisdiction over access to living resources in their EEZ. At most, coastal states shall take into account historic fishing in the EEZ if and when allocating catch surplus to foreign states.100 Any resulting economic dislocation in historic fishing or researching states is just one of many non-exhaustive factors the coastal state shall weigh under Article 62(3) of UNCLOS when allocating catch surplus to foreign states.101 UNCLOS is largely silent on defining or elaborating the broader conception and acquisition of historic rights,102 although general requirements including consistency with UNCLOS and general international law, as well as following the UNCLOS drafters' intent, shall apply.103 The South China Sea Arbitration 96 The author is indebted to Valentin Schatz for sharing an advance draft of his Ph.D. manuscript's chapter on historic fishing rights. 97 UNCLOS, supra note 5, arts. 10(6), 15, 46, 298(1)(a)(i); Continental Shelf (Tunis. v. Libya), Judgment, 1982 I.C.J. 18, ¶ 100 (Feb. 24) ("It seems clear that the matter continues to be governed by general international law [which] does not provide for a single 'régime' for 'historic waters' or 'historic bays' , but only for a particular régime for each of the concrete, recognised cases of 'historic waters' or 'historic bays'"). Award (SCS Award) reaffirms that "historic rights" encompasses both historic waters and historic rights falling short of a claim to sovereignty, such as historic fishing rights.104 Different historic rights require different thresholds of necessary practice and acquiescence to be established. Nonetheless, the process of acquisition is similar: [H]istoric waters are merely one form of historic right and the process is the same for claims to rights short of sovereignty […] historic rights are, in most instances, exceptional rights. They accord a right that a State would not otherwise hold, were it not for the operation of the historical process giving rise to the right and the acquiescence of other States in the process (emphasis added).105 The distinguishing factor between historic waters, historic fishing rights, and traditional fishing rights is the extent of exceptional right(s) claimed.
Respectively, this extent ranges from a historic right to sovereignty (a defined area: encompassing all the territorial sovereign's rights); a historic right to fishing short of claiming sovereignty (a defined area and defined marine living resource(s): encompassing non-exclusive rights of access and utilization); and a historic right to fishing short of claiming sovereignty and limited to traditional communities and/or methods (a defined area, defined marine living resource(s)and defined actors: encompassing non-exclusive rights of access and utilization). Artisanal fishing rights are, in turn, a more narrowly defined historic fishing right than traditional fishing rights.106 In short, "the scope of a claim to historic rights depends upon the scope of the acts that are carried out as the exercise of the claimed right".107 Figure 1 (below) captures this diversity in scope and terminology: A coastal state's acquiescence cannot be presumed for any activities beyond the historic practices, and thus international law recognizes diverse practices resulting in diverse historic rights.108 In cases where sovereignty is disputed, as in most international jurisprudence to date, exceptionalism has been evident among all potential claimant coastal states. Communal exceptionalism reiterates that the eventual resolution of which state has sovereignty over the territorial sea will not prejudice the continuity of the other states' historic fishing rights. Historic fishing rights are exceptional. Exceptionalism mandates a continuous and effective exercise of fishing, combined with the acquiescence of the coastal state who would otherwise exercise full sovereignty over the fishery. Exceptionalism, therefore, dictates that customary historic fishing rights can only be established in the internal waters or territorial sea of a foreign state.109 107  Schatz takes this exceptionalism requirement one step further, arguing that historic fishing rights could be further limited to the belt of the territorial sea that was established before the conclusion of UNCLOS -i.e. the limited waters where sovereignty and therefore acquiescence of the coastal state could historically have been established.110 As the SCS Award held, not only are historic fishing rights in the EEZ, continental shelf, high seas, or the Area not expressly permitted in UNCLOS,111 but Articles 56, 58, 62, 77, and 309 of UNCLOS illustrate that a continued claim to historic fishing rights in a foreign state's EEZ or continental shelf (without coastal state consent) would be incompatible with UNCLOS.112 This position is widely shared in the region, with Indonesia, for example, citing the SCS Award and affirming the lack of historic rights in the EEZ or continental shelf post-UNCLOS.113 As Schatz highlights, a "host of EEZ fisheries access agreements concluded during the 1970s […] provided for a gradual phase-out of historic foreign fishing activity instead of recognizing permanent historic rights".114 Concerning high seas fishing, this is an exercise of existing freedom,115 thus lacking any exceptionalism to establish historic rights.116 Indeed, as a condition of establishing the UNCLOS novelty of archipelagic waters, those states immediately adjacent to archipelagic waters successfully negotiated UNCLOS-based 'traditional fishing rights' to preserve their former high seas fishing therein. 117 Finally, the position of certain states in the ongoing BBNJ Agreement negotiations has brought uncertainty to the exclusion of fisheries from the Area's regime,118 but for the purposes of this article former technological limitations mean that historic fishing rights therein are highly unlikely.119

Associated Rights and Access to Port
Historic fishing rights are not absolute. Reasonable regulation by the coastal state may apply and international courts and tribunals have emphasized the coastal state's right to impose environmental regulation.120 The extent of protection due to historic fishing states is established on a case-by-case basis.121 However, the concept of associated rights may further limit a coastal state's right to regulate foreign vessels or persons exercising historic fishing rights. Associated rights were recognized and defined in the Eritrea/Yemen Award,122 whereby the Tribunal held: In order that the entitlements be real and not merely theoretical, the traditional regime has also recognised certain associated rights.123 What is more, the Tribunal then affirmed an associated right of access to port and port services for historic fishers in the Red Sea. First, Stage I of proceedings recognized that historic practices included both the fishers' access to islands as a refuge from poor weather and the fishers' access to each state's coastal markets without a need for authorization.124 Second, Stage II then confirmed: There must be free access to and from the islands concerned -including unimpeded passage through waters in which, by virtue of its sovereignty over the islands, Yemen is entitled to exclude all third Parties or subject their presence to licence, just as it may do in respect of Eritrean industrial fishing. This free passage for artisanal fishermen has traditionally existed not only between Eritrea and the islands, but also between the islands and the Yemen coast. The entitlement to enter the relevant ports, and to sell and market the fish there, is an integral element of the traditional regime.
[…] Eritrean artisanal fisherman fishing around the islands awarded to Yemen have had free access to Maydi, Khoba, Hodeidah, Khokha and Mocha on the Yemen coast, just as Yemeni artisanal fishermen fishing around the islands have had an entitlement to unimpeded transit to and access to Assab, Tio, Dahlak and Massawa on the Eritrean coast. Nationals of the one country have an entitlement to sell on equal terms and without any discrimination in the ports of the other (emphasis added)125 Historic fishing regimes may therefore have application beyond the maritime zone in which the fishery is located, including associated rights in the ports of foreign states.126 An associated right to access foreign ports will be an exceptional restriction on the sovereignty of port states to otherwise oppose access by foreign vessels.127 Again, associated rights may also be subject to coastal state -or port state -regulation. This regulation may not however result in the denial of the right of access without the consent of the fishers' state of nationality.128 Finally, the Eritrea/Yemen Award's doctrinal contribution comes with a considerable caveat, namely critiques on the facts, including that the finding of an associated right of access to port goes beyond what the parties requested.129 International courts and tribunals have not recognized any further explicit cases of historic access to port as an associated right.130 Interestingly, the SCS Award did distinguish access rights from fishing rights.131 If, as the SCS Award reasons, a historic right of access to the territorial sea can limit a coastal state's territorial sovereignty, there is no additional principle of international law that prevents a historic right of access to port as limiting a port state's sovereignty. Equally, if UNCLOS essentially preserves the historic territorial sea regime and its historic fishing rights,132 then associated rights of port entry are also preserved because UNCLOS did not introduce any meaningful novelties to the regime of internal waters.
Nonetheless, an associated right is an additional historic right and therefore must independently meet the exceptionalism requirement. A sufficient degree of unhindered access to port by historic fishing vessels, demonstrative of the acquiescence of the port state, must have occurred. It is the very rejection of a general right of port entry (subsection 2.4) which allows for the possibility of a historic customary law right of port entry.
However, if a customary historic right of access to port may only be an associated right, then practice is clearly limited to exceptional cases where an exceptional historic fishing right is also first established. For example, a convenient and historic use of foreign ports to support high seas fishing could never establish a historic right of port access because no historic fishing rights -to which port access could be 'associated' -could crystalize. Exceptional rights have, by definition, a narrow future in international law. As customary historic fishing rights progressively extinguish,133 so too will any associated right of access to port.134 Alternatively, historic customs of port entry could be incorporated into a treaty which, either immediately (if such an intention can be established), or upon an extended period of exercising port access under the said treaty, extinguishes the custom. 135 The exceptional historic consent to port entry would be replaced by the consent to access port established in the treaty. In a different -but comparable -context, agreements reflecting the treaty-based rights of Articles 47(6) or Article 51(1) of UNCLOS, such as seen between Indonesia and Malaysia, may include associated rights of access to territories and resupply, akin to port access. 136 An example from Australia may nonetheless be suggestive of a historic fishing right and an associated customary right of access to port continuing in parallel to a treaty-based framework. 137 The Torres Strait Treaty provides for a Protected Zone which seeks to protect the traditional way of life of traditional inhabitants.138 Apart from preserving traditional fishing, the Torres Strait Treaty also protects freedom of movement in the area related to traditional activities, such as the movement for the purposes of "barter and market trade".139 This is reaffirmed in Australia's Torres Strait Fisheries Act 1984 whereby the offense of unauthorized landing includes an exception for "fish that were taken in the course of traditional fishing and landed at that place for the purpose of the performance of traditional activities". 140 The language of the Torres Strait Treaty suggests that the historic rights and obligations of each state and its nationals shall "continue" and are not replaced by the Torres Strait Treaty.141

Conclusion
One state's historic right is another state's restriction to sovereignty. Historic rights cannot be presumed,142 but must fulfill the exceptionalism requirement most recently reaffirmed in the SCS Award. By examining historic fishing rights and associated rights from the perspective of port state jurisdiction, this article has sought to demonstrate that the current consensus on access to ports should be refined by an additional exception, namely, any associated right of port entry for fishers exercising historic fishing rights. This is in addition to -and distinct from -the customary law right of access to port or another sheltered area when vessels are in distress or compelled by force majeure, to access port to preserve human life. While the right of access for vessels in distress is a global custom, the right of access for historic fishers in the Eritrea/Yemen Award is limited to governing the rights and obligations between the port state and the fishers' state of nationality. The latter case is therefore a concrete example of the concept of bilateral customary international law, first recognized in the Right of Passage over Indian Territory.143 Historic fishing rights, and thus associated rights (if inseverable), cannot generally be transferred to foreign states and their nationals.144 The associated right of access to port and port services will therefore remain a bilateral custom.