松浦银鲫形态学特征及主要经济性状

The Morphologlcal Feature And Important Economic Character of The New Breed of Heilongjiong Crucian Carp-Song pn Crucian Carp

松浦银鲫主要形态学性状：体高／体长比为４２．６％，头长／体长比为２６．７％，体厚／体长比为２０．３％，尾柄长／体长比为１２．７％，尾柄高／体长比为１６．８％，背吻距／体长比为４９．９％，背尾距／体长比为５６．２％，体厚／头长比为７６．４％。侧线鳞数和侧线至背鳍基部及侧线至腹鳍基部的鳞片数为，第一鳃弓左鳃耙数为５０．５个，体背部青灰色，体侧谈绿色，腹部姜黄色。上述指数除头长／体长比外，都与方正银鲫明显不同，而细胞遗传学特征与方正银鲫相同，群体中雄性极少，为雌核发育群体。松浦银鲫个体较大，生长较快，一龄鱼稍快于方正银鲫，体重３０克以上．二龄鱼体重约１６０克。群体生产力，在与鲤、鲢等鱼混养情况下，亩产３０—４５公斤。由于松浦银鲫体高较高，１—３龄鱼的肥满系数明显高于方正银鲫，鱼肉营养成份中，粗脂肪在鲜肉（３．６％）和干肉（１４．８％）中都明显低于方正银鲫，这是松浦银鲫的一个极有价值的指标。松浦银鲫和方正银鲫一样繁殖力极强，２龄即能成熟和繁殖，因此其生产能力很大。

From 1956 to 1990, the morOPhological character of the new crucian carp ,reed was determined. It was observed that scale number of lateral line is 32 7/7.3ill rakers 50.5, Heigth/standard length is 42.6% head length/standard length is 26. 7%, body width/standard length is 20. 3%,caudal peduncle length/stardard length is 12.7%, caudal peduncle depth/length is 16. 8%, distance tetween dorsal flnand end of snnut/body length 49.9%, distance between dorsal finale and caudal fin/body length 56.2%, body width/head length is 76.4%, All the index are - different from that of Fangzheng crucian carp except the head and standard length. The charater cell genetics is same with Fanzheng crucian carp. The male is seldom in the group.The growth of the new breed is about 309 a little fast that of Fangzheng crucian in first 1 is about 160g in second year, the same as the FangZheng crucian carp.The fat-full index 4% the new breed is heigher than that of Fangzheng crucian carp in three ages. The fat is lower than Fangzheng crucian carp 3. 6% in wet,14.8 % in dry. This is a valuable index of the new breed. The another valuable character of crucian carp is that the growth is continued after sexual maturity.