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Macrozoobenthos in the inshore zone of the Northern Aral Sea

The macrozoobenthos was investigated at eight sites in the Aral Sea inshore zone and in the lower reaches of the Syrdaria river. In the sea, the benthos comprised bivalve molluscs Syndosmya segmentum Recluz and Cerastoderma isthmicum Issel, gastropods from Caspiohy- drobia Starob., the polychaete Nereis diversicolor O.E M/filler and the crab Rhithropanopeus harrisii tridentatus (Maitland). In the Syrdaria, Mysidae Paramysis lacustris (Czern.) and Gam- maridae Dikerogammarus aralensis (Uljanin) were found. These taxa have not been recorded from the Sea since the 1970s. The total zoobenthos biomass and density varied between the investigated Sea areas from 92 to 582 g/m 2 and from 1,600 to 39,000 ind.lm 2, respectively. Spatial and temporal salinity changes within the range 20--41 g/L did not affect macrozooben- thos composition and structure. The conclusion is that the benthic ecosystem of the Aral Sea was in a state of comparative stability from the middle of the 1980s to the middle of the 1990s. Analysis of the zoobenthos in the inshore zone is proposed as a convenient and accessible method for monitoring the status of the zoobenthos of the entire Aral Sea.