黄海中南部细纹狮子鱼繁殖生物学特征的年际变化

基于1985-1986年和2011-2012年"北斗"号渔业调查船在黄海中南部的底拖网数据,对细纹狮子鱼的绝对繁殖力、相对繁殖力、卵径、性腺成熟度等繁殖生物学特征的年代际变化进行了研究。结果表明,黄海中南部细纹狮子鱼卵径分布由1985-1986年的多峰型转变为2011-2012年的双峰型,但平均卵径由(1.1±0.2)mm增加至(1.2±0.1)mm。2011年1月细纹狮子鱼性成熟系数和肥满度比1986年1月有所下降,均与绝对繁殖力无显著相关(P0.05)。1985-1986年细纹狮子鱼个体绝对繁殖力F为9407-84209粒,平均为(37677±3625)粒,体长相对繁殖力FL为446-1981粒/cm,体重相对繁殖力FW为18-157粒/g,均高于2011-2012年细纹狮子鱼个体绝对繁殖力2984-81614粒,平均为(24728±2822)粒]和相对繁殖力(FL为114-1690粒/cm,FW为15-106粒/g),但协方差检验两个年代间繁殖力参数发现无显著差异。1985-1986年和2011-2012年细纹狮子鱼F与体长均呈幂正相关,与体重呈线性正相关;体长与FL呈线性正相关,与FW呈线性负相关,体重与FL、FW不存在明显相关性。

Inter-annual variations in propagational biological characteristics of Liparis tanakae in central and southern Yellow Sea

Due to the increasing effects of anthropic activities and the climate change, there appears to be a rapid shift in the dominant species of fish in the Yellow Sea. Since the 1980s, Liparis tanakae has become the dominant species and now plays an important role in the dynamics of fishery resources in the Yellow Sea. In order to clarify the recruitment and the dynamics of L. tanakae population, we analyzed the inter-annual variations in the absolute fecundity, relative fecundity, egg diameter and gonadosomatic index of L. tanakae, based on the bottom trawl data collected by R/V ＂Beidou＂ in the central and southern Yellow Sea during 1985 -1986 and 2011 -2012. We found that the distribution of L. tanakae＇ s egg diameter changed from multi-peak in 1985 - 1986 to double-peak in 2011 - 2012, with an increase in the average value from （ 1.1 ± 0. 2） mm to （ 1.2 ± 0. 1 ） mm. The gonadosomatic index and condition factors measured in Jan, 2011 were lower than those measured in Jan, 1986, and there were no significant differences （P 〉 0. 05 ） between these two parameters and the absolute fecundity. The absolute fecundity （F） of L. tanakae was 9407 - 84209 eggs （37677 ± 3625 eggs in average） found in 1985 - 1986, and the relative fecundity estimated with the body length （FL） and the body weight （Fw） was 446 - 1981 eggs/cm and 18 - 157 eggs/g, respectively. All the values of the fecundity measured in 2011 - 2012 were lower than those measured in 1985 - 1986 ： the absolute fecundity was 2984 -81614 eggs （24728 ＋ 2822 eggs in average）, FL was 114 -1690 eggs/cm, and Fw was 15 - 106 eggs/g. No significant differences （ P 〉 0. 05 ） were detected in fecundity parameters between the two periods according to the covariance analysis. There was a positive power index correlation between F and the body length, and a positive linear correlation between F and the body weight. There was also a positive linear correlation between FL and the body length. In contrast, a negative linear correlation was found between FW and the body length. However, there was no significant correlation between FL, FW and the body weight. These results suggested that the L. tanakae population was relatively stable under the influence of multi-stressors in the Yellow Sea.