鄱阳湖产银鱼生长的研究

STUDY ON THE GROWTH OF SALANGID FISHES IN POYANG LAKE

记述了鄱阳湖产3种银鱼的完整世代的个体体长、体重增长情况.通过对生长指标的分析,将每种鱼的生长划分为若干阶段.太湖短吻银鱼(Neosa-lanx tankahkeii taihuensis)生长较快的阶段在3—7月和9—12月;乔氏短吻银鱼(Neosalanx jordani)生长较快的阶段在3—5月、9—10月和翌年3—5月;雷氏银鱼(Reganisalanx brachyrostralis)生长较快的阶段在2—8月和10—11月.此外,由最小二乘线性回归法,求得3种银鱼体长(体高)与体重的关系:太湖短吻银鱼W=3.12290×10^(-4)·l^(3·65443),或W=1.82594×10^(-2)·l^(2·23828)·h^(0·847895);乔氏短吻银鱼W=4.54854×10^(-3)·l^(2·94307);雷氏银鱼W=6.62807×10^(-4)·l^(3·24125).根据对银鱼个体生长的研究,认为在鄱阳湖南部捕捞银鱼的时间应在11月15日至12月31日,其他水域捕捞银鱼应在11月1日至12月31日.

The three species of salangid fishes, Neosalanx tangkahkeii taihuensis, Neosalanx jordani and Reganisalanx brachyrostralis have one-year life span. N. tangkahkeii taihuensis grows quickly from March to July and from September to December, during the latter period its body weight increases 0.65 times per month. The rapid growth periods of N. jordani are before May, from September to October and from March to May. That of R. brachyrostralis are before August and from October to November. The relationship formulas between the body weight W(mg) and the body length l (mm) arc calculated to be as follow: N. tangkahkeii taihuensis W = 3.12290 × 10-4/ 3.65443. N. jordani W = 4.54854 × 10-3/2.94307. R. brachyrostralis W = 6.62807×10-4/3.24125. Based on the patterns of their growth, we suggest that the season of catching the three species of salangid fishes in the south of Poyang Lake might be profitably set from November 15 to December 31 , and in the rest part of Poyang Lake from November 1 to December 31.