BIOLOGY OF LANDLOCKED NEOSALANX PSEUDOTAIHUENSIS IN THA XUJIAHE RESERVOIR, CHINA

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.