草鱼Ctenopharyngodon idellus（Cuvier et Valenciennes）

英文名： Grass carp

地方名： 鲩鱼、草根

分类地位： 鲤形目，鲤科，青鱼属

形态特征： 体型长，呈圆筒状，腹圆无棱，尾部侧扁。头顶颇宽。吻短而圆钝。口端位，无须。鳞片颇大，圆形。背鳍iii- 7；臀鳍iii- 8。侧线鳞36~48。体呈茶黄色，腹部灰白色，胸、腹鳍略带灰黄色，其他各鳍色较暗。

生态习性： 喜栖息于江河、湖泊等水域的中、下层及近岸多水草区域。性情活泼，游泳迅速，常成群觅食，生长快。典型的草食性鱼类，人工养殖可摄食配合饲料。江湖洄游性鱼类，产漂浮性卵。

地理分布： 原产于长江水系。20 世纪50 年代引入宁夏。

经济价值： 是水产养殖当家品种之一，经济价值很高。但在自然水域应控制放养量，避免水域水质富营养化发生。

ENGLISH NAME：Grass carp

LOCAL NAME：Huanyu; Caogen

CLASSIFICATION：Cypriniformes；Cyprinidae; Ctenopharyngodon

MORPHOLOGICAL CHARACTERISTICS: Long body in cylinder shape; round abdomen without scutes; compressed caudal portion; broad vertes; short and obtuse round mouth; terminal mouth without beard; big scales in round shape; dorsal fin iii-7; anal fin iii-8; scales in lateral line 36 ~48; body is tea -yellow; abdomen is offwhite; pectoral fin and ventral fin is slightly isabelline; other fins are in dark color.

ECOLOGICAL HABITS：It likes to live in middle and understratum water area of rivers and lakes, and in shore water area with much aquatic weeds; lively natured and swim promptly, it often forages in group and grows fast; it is a typical herbivorous fish; the cultured fish may eat artificial mixed feed; it is a migrating fish in rivers and lakes, which spawns the floating eggs.

GEOGRAPHICAL DISTRIBUTION: It is originated from the Changjiang River system, and was introduced in Ningxia in 1950's.

ECONOMIC VALUE：It is one of the main aqauaculture species with high economic value, but the breed quantity should be controlled to avoid eutrophication. u9Oi4DmSSu7Dbmtf7OdUfl+iNJMNFGByxAZy1IUZ3zKS5r51KoQwwJPqQJDkvMKo