Male-cod

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

: 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

While cod generally lack obvious external differences between sexes, specific secondary sexual characteristics are vital for male reproductive success. : Studies describe the cod mating system as

: Males use specialized "drumming muscles" to produce sounds that stimulate females and enforce dominance. : Males use specialized "drumming muscles" to produce

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

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.