水丰水库亚洲公鱼和大银鱼种群生态的比较研究

1998年 10月至 2 0 0 0年 11月对水丰水库亚洲公鱼和大银鱼的食性、生长、繁殖、群体结构进行了比较研究 .亚洲公鱼为杂食性鱼类但主要以浮游动物为食 ,繁殖时还摄食同类卵 ,出现频率达 4 2 .9% ,在冬季也摄食大银鱼卵 (2 .8% ) ;体长 (L)、体重 (W)呈异速生长 (W =1.176×10 - 6 L3.5555) ;群体繁殖速度比 1984年以前提高了 4 9.2 % ;群体结构中体长、体重的离散度很小 .大银鱼前期主要以浮游动物为食 ,后期以小鱼小虾为主要食物 ,也捕食公鱼 ,出现频率 6 .9% -9 6 % ;体长、体重呈等速生长 ,W =4 .4 82× 10 - 6 L3.0 0 0 9;群体繁殖速度高出公鱼 1.18倍 ;群体结构中体长、体重的离散度较大 ,表现出了个体间的差异性

Comparative Study on the Population Ecology of Asian Smelt (Hypomesus transpacificus nipponesis)and Large Icefish (Protosalanx hyalocranius)in Shuifeng Reservoir

This paper reports the results of comparative study on the population ecology of asian smelt(Hypomesus transpacificus nipponesis)and large icefish(Protosalanx hyalocranius)in Shuifeng Reservoir from October 1998 to November 2000, which include the behavior of feeding, growth, reprcduction and population structure.The asian smelt is an omnivorous fish which feeds mainly on zooplankton.The eggs of same spcies in spawning period were preyed upon, with a frequency of occurrence of 42.9%.It also fed on eggs of large icefish in winter with a frequency of occurrence of 2.8%.The regression equation of body weight(W)and body length(L)was W=1.176×10^-6L^3.556.The dispersed degree of body length and body weight in population structure was small.The large icefish feeds mainly on zooplankton in early life and adult fish mainly feeds on small fish and shrimp.The frequency of occurrence of asian smelt in the food was 6.9%-9.6%.The regression equation of body weight and body length was W=4.482×10^-6L^3.004.The dispersed degree of body length and body weight was large which showing difference of individual growth.