Looking at fish
We will identify the males and females of fish, but can we understand the fish? What about the sex ratio? Is this related to genetic inheritance?
Under normal circumstances, the sex ratio of fish is close to 1:1. The sex ratio of some fish species is very different. For example, the male-to-male ratio in crucian carp groups can reach 10:1. This situation also exists in perch and mosquito fish.
During reproduction, are there any differences in the sex ratio of spawning fish? The female-to-male ratio in the Mongolian red catfish spawning fish population in Liangzi Lake, Hubei is 6-15:1; the male-male ratio is 3-15:1 for the yellow-tailed catfish and 8-9:1 for the ball-headed catfish. This situation proves that the male fish can discharge semen multiple times. Many fish that build nests and lay eggs, such as black snakehead and betta fish, lay eggs in one female and one male. Carp, crucian carp, wheatear, etc. that lay sticky eggs also chase in pairs when they lay eggs. The sex ratio of catfish on the spawning ground is also 1:1.
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