兴凯湖兴凯鱼白渔业生物学研究

The study on the fishery biology of ErythroCulter dabryi shinkainensis in Xinkai Lake

20 0 1年在兴凯湖档壁镇对兴凯鱼白进行渔业生物学调查 ,共采集兴凯鱼白2 0 3尾。捕捞群体体长由 1 5 3～ 2 6 3cm组成 ,平均为 2 0 6cm ;体重由 5 0～ 2 70g组成 ,平均为 1 2 5g ;年龄组成为 2 +～ 7+龄 ;体长体重相关关系为W =0 0 0 5L3 31 2 ,r=0 983,n =45 ;性比为1∶1 5 (♀∶♂ ) ;相对生殖力 8 3～ 1 2 7 5粒 /g ,平均为 62 7粒 /g;绝对生殖力 75 0～ 30 0 0 0粒 ,平均为 1 0 765粒 ;成熟系数雌群 0 5 6%～ 7 88% ,平均为 4 48% ;雄群 0 60 %～1 88% ,平均为 1 % ;肥满度系数雌群为 1 2～ 1 6% ,平均为 1 4% ;雄群 0 8～ 1 3% ,平均为 1 0 % ;种群数量 2 0 0 1年约 1 60t。兴凯湖兴凯鱼白的资源呈明显下降状态 ,亟待加强种质资源保护。

The 203 Culter dabryi shinkainensis were collected during fishery biology investigation of Xin Kai Lake in Dang Bi town of Xin Kai Lake at 2001.The body length of the captured population ranges from 15 3cm to 26 3cm,and the average is 20 6cm.The body weight ranges from 50 to 270g,the average is 125g.The age composition rages from 2 + to 7 +;the relationship between body weight and body length is:w=0 005L 3 312 ,r=0 983,n=45.The ratio of female and male is 1∶1 5.The relative fecundity ranges from 8 30 to 127 5 eggs per gram body weight;The absolute fecundity ranges from 750 to 30000,the average is 10765.The gonad somatic index of the female is 0 56% to 7 88%,the average is 4 48%;and of the male is 0 60% to 1 88%,the average is 1%.The fullness of the female is 1 2% to 1 6%,the average is 1 4%;and of the male is 0 8% to 1 3%,the average is 1 0%.The amount of population is about 160t in 2001.The fish resource is decliming and needs to be protected.