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

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

: 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. In biological studies, the ( Gadus morhua )

The male cod's role in the Atlantic cod mating system is characterized by high levels of energy expenditure and competitive interaction. This behavior includes: : During spawning, males exhibit

: Males use visual cues, such as circling and extending their pelvic fins, during courtship.

: 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