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Metamorphosis of fiddler crab Ilyoplax pusilla larvae from megalopal to first crab stage was studied in laboratory experiments under various conditions of salinity and substratum. The hatched zoea metamorphose through five stages before reaching megalopal stage. The megalops were placed in a 20 ml Petri dishes (2-3 megalops/dish), with salinities of 10, 20 or 30%%. Each salinity level was tested...