Soon you've landed a female fish, ripe with eggs.

In some species, male and female fish have different standard weight curves.

A school of clownfish is always built into a hierarchy with a female fish at the top.

Large female fish produce more viable offspring and are vital in a population.

So a 30-pound female fish produces about 3 pounds of caviar.

Each female fish brings thousands of dollars on the open market.

Identifying the male and female fish is relatively easy in the spring.

Although these parameters were calculated for female fish, observational data suggests the male life history is similar.

Both male and female fish are about 55 centimetres long at maturity.

FOR the female fish, the need has always been clear and compelling.