This study analysed the rearing of Black Molly Poecilia hybrids. It is a crossbreed of sailfin molly Poecilia latipinna and short-finned molly Poecilia sphenops. Black mollies are very popular aquarium fish which are frequently put into marine aquaria to speed up the maturation of such aquaria. Without being acclimatised to high salinity, the fish are put into water with a salinity of SG 1.025 or 33 ‰. The results indicate that fish which are shorter than 20 mm die in water whose salinity is higher than SG 1.020. However, fish longer than 25 mm can adapt to higher salinity. The results indicate that fish which have been reared in water of higher salinity grow faster.
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