Male-cod Guide

Is cod lekking or a promiscuous group spawner? - Nordeide - 2000

The male cod's role in the Atlantic cod mating system is characterized by high levels of energy expenditure and competitive interaction.

: Successful courtship concludes with a ventral mount , where the male swims beneath the female, grasping her with his pelvic fins to release sperm as she releases eggs. Morphological and Genetic Traits 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, males exhibit significantly higher activity levels than females, often dwelling deeper (typically >20 m) where they engage in territorial and agonistic (aggressive) behaviors. Is cod lekking or a promiscuous group spawner

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

: Males use specialized "drumming muscles" to produce sounds that stimulate females and enforce dominance. Morphological and Genetic Traits In biological studies, the

: Studies describe the cod mating system as a "lek," where males assemble to perform competitive displays. This behavior includes: