Male-cod Guide

: During spawning, males exhibit significantly higher activity levels than females, often dwelling deeper (typically >20 m) where they engage in territorial and agonistic (aggressive) behaviors.

While cod generally lack obvious external differences between sexes, specific secondary sexual characteristics are vital for male reproductive success. male-cod

In biological studies, the ( Gadus morhua ) is a primary subject for understanding complex marine mating systems, reproductive physiology, and sexual dimorphism. Research often focuses on their "lekking" behavior—a system where males compete in a display area to attract females—and the specific physiological adaptations that support this. Reproductive Biology and Behavior : During spawning