List of smallest fish


The world's smallest fish depends on the measurement used.
Based on minimum standard length at maturity the main contenders are Paedocypris progenetica where females can reach it at, the stout infantfish where females reach it at and males at, and Photocorynus spiniceps where males can reach it at, but are attached to the far larger females. If judging smallest based on the species' maximum size, Paedocypris progenetica, dwarf pygmy goby, midget dwarfgoby and the stout infantfish are not known to exceed in standard length, and the two Leptophilypnion sleeper gobies are less than. A level of uncertainty about the full size range exists for some of these, as only a few specimens have been measured.
Little or no data is available on weight of most of these, but at less than it is likely that the stout infantfish is the smallest if using this feature.

List of smallest fish in the world