三倍体湘云鲫性腺指数分析

Analysis of gonadosomatic indexes of the triploid crucian carp

对三倍体湘云鲫和作为对照的二倍体日本白鲫的性指数进行了比较分析。三倍体湘云鲫的卵巢指数、精巢指数、脂肪型“性体”指数都分别低于日本白鲫的卵巢指数、精巢指数及两者的平均值。日本白鲫的卵巢指数是湘云鲫卵巢指数的 2 .85倍 ,日本白鲫的精巢指数是湘云鲫精巢指数的 1.94倍 ,日本白鲫卵巢和精巢的平均指数是湘云鲫脂肪型“性体”指数的 5 .6 0倍。具脂肪型“性体”的湘云鲫生长速度最快 ,其次是雌性湘云鲫 ,最后是雄性湘云鲫。根据性体指数对照 ,说明三倍体湘云鲫的性腺发育受到不同程度的抑制 ,其中脂肪型“性体”中生殖细胞的发育完全被抑制 ;卵巢发育的抑制程度大于精巢 ,其主要抑制效应表现在具有卵黄的卵母细胞的大幅度减少。无论从生殖角度还是生长角度来考虑 ,具有脂肪型“性体”

The gonadosomatic indexes (GSI) of the triploid crucian carp, produced by crossing the alloteraploid hybrids( ♂) of red crucian carp (Carassius auratus red var.) ×common carp (Cyprinus carpio L.) with the diploid Japanese crucian carp (♀)(Carassius auratus cuvieri T. et S.), and the diploid Japanese crucian carp were compared. The indexes of the ovaries, testes and the fat tissue 'gonad' found in the triploid crucian carp were respectively lower than those of the ovaries, testes and the average value of the ovaries and testes found in the Japanese crucian carp. The indexes of the ovaries and the testes in the Japanese crucian carp were respectively 2.85 and 1.94 times of the indexes of the ovaries and the testes in the triploid crucian carp. The index of the average value of the ovaries and testes in the Japanese crucian carp was 5.60 times of that of the fat tissue found in the triploid crucian carp. In the triploid crucian carp, the fish with the fat tissue 'gonad' grew faster than the others. The females grew faster than the males. No germ cells in the fat tissue 'gonad' were observed, suggesting that the development of the germ cells was completely repressed. The repressed degree of the ovaries in the female triploids was higher than that of the testes in the male triploids due to the absence of the yolk in the oogonium like cells that occupy most space of the ovaries. Considering the sterility and the fast growth rate, the triploid fish with the fat tissue 'gonad' were the best ones.