BROODSTOCK, SPAWNING, AND EGG HANDLING 



139 





M:ii^::::i:il:i 









Figure 44. Sexual dimorphism develops in mature broodfish. The male blue- 

 gill becomes much darker than the female and changes body shape (upper 

 panel). Male salmon also show changes in color and the jaw becomes hooked, 

 forming a kype (lower panel). 



