Three major differences between the sexes in fish

Three major differences between the sexes in fish, and give examples. 1813416 生技1 祝悦

• Testis: Testis consist of a pair of small, creamy white testis located on both sides of the ventral surface, with a variety of traits (terete, striate, leafy).

• ovary: • • • Pairs are located on either side of the midline of the body cavity The immature ovaries are striped, and there are egg granulosa and enlarged after maturity There is peritoneum outside and a white membrane inside The ovaries of coilia ectenes

• The fish ball is a local deformity of the epidermal cells of fish. In certain parts of the epidermis, some cells gradually expand gather into cushions above which the epidermal cells closest to the outer epidermis become keratinized, and these cells become completely lifeless and filled with keratin. The horny mass was shaped like a nodule. • Usually the male has it and the female doesn't. More in carp fish and so on.

• • • Male mating organs of cartilaginous fish. Males of platybranchial fishes whose mating allocators are located on the medial side of their pelvic fins and are a pair of rod-shaped structures with cartilaginous support and are called clasper. The clasper is a part of the pelvic fin. There is a groove on each side adjacent to the two finned feet, and the two grooves combine to form a tube. Only the males have clasper , but the females do not.

• • • The sex difference of fish is not only based on the distinction between primary sexual characteristics - ovaries and testis, but also can be identified by the secondary sexual characteristics. But the secondary sexual characteristics are usually more obvious in the reproductive season, usually difficult to accurately distinguish. According to the first sexual characteristics of most fish, the female fish is generally larger than the male fish, abdominal expansion, reproductive hole slightly convex. Males show variation in fins and snouts. Secondly, many fish in the reproductive season color variation, male fish appear bright color. Some male fishes appear fish ball on the body, especially on the snout and pectoral fin.

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