徐家河水库陆封近太湖新银鱼生物学研究

BIOLOGY OF LANDLOCKED NEOSALANX PSEUDOTAIHUENSIS IN THA XUJIAHE RESERVOIR, CHINA

1992年5月至1996年8月对徐家河水库近太湖新银鱼的形态学,繁殖特性,生长以及食性进行了研究。结果表明,徐家河水库近太湖新银鱼主要以枝角类和桡足类为食,繁殖季节为3—6月,其中4月中旬为繁殖高峰期,与太湖新银鱼不同只有春季产卵群体,生命周期为一年。体重与体长关系为:W=2.014×10^(-6)L^(3.170)(r=0.999)。其von Benrtalanffy生长方程为L_t=65.07[1-e^(-0.2394(t+0.5066))]forbody length and W_t=1.128[1-e^(-0.2394(t+0.5066))]^(3.170)。

The morphological and reproductive traits, growth and diet of Neosalanx pseudotai-huensis are described based on the samples collected between May 1992 and August 1996 in Xujiahe Reservoir, Hubei province, China. The fish fed predominantly on cladocerans and copepods. Its reproductive periods were between March and June with spawning activity peaking in the middle of April. Data on length-frequency and gonadal development demonstrate that the fish typically died with a few weeks after spawning. Therefore, its life span was one year with only one spawning population (the spring spawning population) in Xujiahe Reservoir. By the age of 12 months, the had reached 61.4 mm in body length and 0.98 g in body weight in average. The relationship between body weight and body length could be expressed as W = 2.014 × 10-6L3.170(r = 0.999). The respective von Bertalanffy growth equations were Lt = 65.07 [1 -e-0.2394(t+0.5066) ] for body length and Wt = 1.128 [1 - e-0.2394(t+0.5066)]3.170 for body weight.