渤海梭鱼的年龄与生长

梭鱼Liza haematocheila(T.et.S)分布于我国、日本、朝鲜、苏联远东沿岸,是沿岸的经济鱼类,也是半咸淡水、海水鱼类的主要增养殖对象,该鱼肉味鲜美,是良好的养殖对象.关于梭鱼轮相的特征,辽宁水产研究所(1959)、李明德(1978)曾作过系统的报道,但迄今对该鱼的生长尚未作深入的研究.本文对渤海及某些地区梭鱼的年龄与生长作一系统的报道. 鳞片取材于河北省黄骅、天津市北塘及塘沽附近渤海海区,分别于1960—1961、1962—1963、1978—1979年共测定梭鱼1,399尾.

THE AGE AND GROWTH OF MULLET IN BOHAI SEA

The present paper is a report on the age-composition, growth and growth-index of mullet. All specimens (Total 1399) were collected from Bohai Sea, during the years 1960-1961,1962-1963,1978-1979. Fishes measured on the average (one-year old)127.94-165.34mm; (two-year old)212.71-276.25mm;(three-year old)298.54-368.85mm;(four-year old) 381.61-467.2mm and (seven-year old) 633.5-663mm.The growth of the female fish is more quick than the male. Formation of annulus in the scale occurs in the middle of april to June. The growth of mullet can be divided into three stages as following: the first stage (one to two years) is the prematurity stake, the average of it growth-index is 47.3.The Second stage (three to five years) is a quick-growth syage,the average growth-index is 82.39.The third stage (six years and afterwards),is the degeneration stage, the average growth-index is 42.76.