Fish sexual maturity - a period of fish life, during which fish have the ability to reproduce themselves. In different fish sexually mature comes at different times and depends on habitat conditions, primarily on water temperature and food.

The onset of the ability to reproduce. It occurs in different species of fish at different ages, accelerating or slowing down under the influence of the conditions of existence (temperature regime, nutrition, etc.). Accelerated sexual maturation is usually, but not always, associated with increased growth rate (sterlet maturation in ponds is retarded despite good growth). Carp become sexually mature at 4-5 years, silver carp at 2-3 years, males usually mature one year earlier than females.