中国水产科学2011，Vol.18Issue(3)：602-610,9.DOI:10.3724/SP.J.1118.2011.00602
小黄鱼体长-体质量关系和肥满度的年际变化
Inter-annual changes on body weight-length relationship and relative fatness of small yellow croaker (Larimichthys polyactis)
摘要
Abstract
Based on data from 14 bottom trawl surveys in the Bohai Sea and the southern Yellow Sea during spring (from April to May) of 1960-2004 and spring of 1960-2010, inter-annual changes on body weight-length relationship (WLR) and relative fatness of two geographical stocks of small yellow croaker Larimichthys polyactis [the northern Yellow Sea-Bohai Sea stock (NYBS) and the southern Yellow Sea stock (SYS)]and their impact factors were analyzed.WLR was linearly regressed by logarithm-transformed body length and its corresponding mean body weight; relative fatness was computed by relative weight by years, sex and stocks.The results showed that the allometric factor(b) was not significantly different between sexes in most years, and significantly negative correlations (P＜0.01) were found between the condition factor (a) and b in two stocks.The (lga)/b ratio may be connected with fish body density, and its value was little influenced by environment.The b values almost approached 3, which indicated isometric growth in the NYBS stock in most surveys from 1960 to 2004, and they increased during the regression stage and the early recovery stage of the stock (1982-1993).However, most of b values were significantly smaller than 3 (P＜0.05), indicating strongly negative-allometric growth in the SYS stock from 1960 to 2010, and they decreased during the regression stage and the early recovery stage of the stock (1986-1994), then increased since the late 1990s.The highest relative fatness of small yellow croaker was found in 1960 in the two stocks.The fatness clearly decreased in total from 1960 to 2004 in both male and female fish in the NYBS stock, and it significantly declined from 1960 to 1986 in the SYS stock (P＜0.05), then slightly and insignificantly increased since the mid-1990s in both male and female fish in the SYS stock (P＞0.05).According to analysis, based on better food conditions, the relative low fishing pressure was the main reason for the isometric growth of the NYBS during the 1980s and the early 1990s; and the continually heavy fishery increased the proportion of low age fish and the growth speed in the SYS, which may be the main reasons for the negative-allometric growth of the stock.The decrease in age at maturity may be the reason of the decline in the relative fatness in both stocks, but the closed seasons and the relative higher water temperature in the southern Yellow Sea made the relative fatness increase since the mid-1990s in the SYS.关键词
小黄鱼/体长-体质量关系/肥满度/年际变化/影响因子Key words
Larimichthys polyactis/ body weight-length relationship/ relative fatness/ inter-annual change/ impact factor分类
农业科技引用本文复制引用
李忠炉,金显仕,单秀娟,戴芳群..小黄鱼体长-体质量关系和肥满度的年际变化[J].中国水产科学,2011,18(3):602-610,9.基金项目
国家863计划项目(2009AA09Z401) （2009AA09Z401）
国家自然科学基金资助项目(40906086) （40906086）
山东省泰山学者专项基金资助项目. （）
