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One of world's smallest fish based on the minimum size at maturity is "Schindleria brevipinguis" from Australia,their females reach it at 7 mm (0.28 in) and males at 6.5 mm (0.26 in), Males of "S. brevipinguis" have an average standard length of , a gravid female was . This fish, a member of the goby family, has its first anal-fin ray further forward, under dorsal-fin 4.
Male individuals of the anglerfish species "Photocorynus spiniceps" have been documented to be at maturity, and thus claimed to be a smaller species. However, these survive only by sexual parasitism and the female individuals reach the significantly larger size of .
Male individuals of the anglerfish species "Photocorynus spiniceps"