黄海南部近岸小黄鱼产卵群体生物学的初步研究

A Preliminary Study on the Biology of the Spawning Stock of Small Yellow Croaker(Larimichthys polyactis)Inhabiting the Near Shore of Southern Yellow Sea

通过分析2006年5月和2013年5月在黄海南部吕泗渔场近岸调查采集的792和247尾小黄鱼标本,对小黄鱼产卵群体的生物学特征进行初步研究。研究显示:2006年小黄鱼产卵群体体长范围为136~249mm,纯体重范围为17.48~107.11g,年龄组成I^II龄,I龄占55%。绝对繁殖力F变动于2 006~34 509粒,平均(14 193±1 131)粒/尾;体重相对繁殖力FW变动于30~635粒/g,平均(252±23)粒/g。绝对繁殖力与纯体重的关系为F=248.36 W+177.18,与体长的关系为F=0.053×L2.321 4。2013年小黄鱼产卵群体体长范围为132~204mm,纯体重范围为29.95~102.40g,年龄组成I^II龄,I龄占82%。绝对繁殖力F变动于5 586~21 688粒,平均(11 069±946)粒/尾;体重相对繁殖力FW变动于171~331粒/g,平均(235±19)粒/g。绝对繁殖力与纯体重的关系为F=178.70 W+2 504.1,与体长的关系为F=0.010×L2.746 9。与历史记录比较,发现其繁殖力水平有减小的趋势。

Based on 792 and 247 small yellow croaker individuals collected in May 2006 and May 2013,respectively,from near shore seawater of Lvsi fishing ground,Southern Yellow Sea,we described preliminarily the biological characteristics of the spawning stock of small yellow croaker （Larimichthys polyactis）.The body length of this spawning stock ranged from 136 to 249 mm,and the gutted weight ranged from 17.48 to 107.11 g in 2006.The stock was composed of individuals at ages between Ⅰ and Ⅱ,and individuals at age Ⅰ accounted for 55％ of the total.The individual absolute fecundity F （ind.）ranged from 2006 to 34 509 （14 193±1 131）,and the individual relative fecundity F/W （ind./g） ranged from 30 to 635 （252±21）.The relationship between the individual absolute fecundity F （ind.） and net weight W （g） was expressed as F=248.36×W±177.18.The relationship between individual absolute fecundity F （ind.） and body length L （mm） was expressed as F=0.053×L2＂3214.In 2013,the body length of spawning stock ranged from 132 to 204 mm,and the gutted weight ranged from 29.95 to 102.40 g.The stock was composed of individuals at ages between Ⅰ and Ⅱ,and the individuals at age Ⅰ accounted for 82％ of the total.The individual absolute fecundity F （ind.） ranged from,5 586 to 21 688 （11 069±946）,and the individual relative fecundity F/W （ind./g） ranged from 171 to 331 （235±19）.The relationship between the individual absolute fecundity F （ind.） and gutted weight W （g） was expressed as F =178.70 × W ＋ 2 504.1.The relationship between the individual absolute fecundity F （ind.） and body length L （mm） was expressed as F=0.010 × L2.7469.Compared with historical data,the fecundity of small yellow croaker tended to decrease.