Biology
Argulus japonicus eggs
Argulus leaves its host periodically to lay eggs on submerged objects in its environment.
Females extrude eggs and cement them to solid surfaces in multiple rows. Eggs hatch as an infective larva which has only rudimentary swimming legs, but has long setae on the antennae and mandibles which it uses to swim.
The infective larva locates and attaches to a suitable host and passes through several moults before reaching maturity.