AquAdvantage salmon anadromous GM male salmon lack reproductive success and have a reduced number of surviving offspring. GM salmon's lack of fertilization success can be attributed to nest fidelity, quivering frequency, and spawn participation. Under simulated competition environments, 94% of siring occurred by wild-type salmon, while only 5.4% was attributed to GM salmon. This advantage allows more than twice as many wild-type offspring to be produced. Other characteristics that could cause wild-type males to be chosen more frequently could be the lack of growth of the kype, the hooked jaw of a male, and red coloration on anadromous males, which demonstrates sexual
Ostorhinchus doederleini the male is solitary while brooding. He may incubate several broods during one breeding season, which is a few months long, depending on location. One mass contains about 10,000 eggs. One brood is incubated for 5 to 17 days. The length of time depends on water temperature. A larger male will generally incubate more eggs at a time. Also, males' mouths get larger during the breeding season, expanding significantly. The lower jaw becomes more depressed in shape. The male quite often eats his eggs. In one study, 361 egg masses were brooded by males, and they had eaten 47 of