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Why do some gobies have pelvic fins that form a cuplike sucker?
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perciform
Bluefin tuna (Thunnus thynnus orientalis) in the waters near Japan.
Most gobies are bottom-dwelling fish that possess a weak suction cup formed by the fusion of their pelvic fins. This specialized structure allows these fish to anchor themselves to surfaces, which is particularly advantageous for maintaining their position in their typical habitats along shores and among reefs in tropical and temperate seas.1