Shallower slopes may produce broader and gentler valleys. Daily vertical migration between shallower and deeper waters has also been recorded. There are indications that they prefer depths shallower than . The thermocline may be present in shallower coastal waters. Most dives are much shorter in duration and shallower than . Water waves travel slower in shallower water. Sharks tend to be solitary on shallower reefs and pinnacles. These devices draw on much shallower and colder resources than traditional geothermal techniques. Night fishing baits are usually fished much shallower, often less than . All endemics have been recorded between , but the majority mainly live at shallower depths. Deep possibly represent taxa distinct from those in shallower ecosystems. This makes the deep-sea much poorer in productivity than shallower regions. The remainder either remained afloat, or were towed to shallower waters and beached. Deep may represent independent taxa from those shallower ecosystems. Alleviation of the effects upon ascending to a shallower depth will confirm the diagnosis.