水生态学杂志2017，Vol.38Issue(3)：83-88,6.
鄱阳湖刀鲚生殖群体特征及状况分析
Reproductive Characteristics and Situation of Coilia ectenes (Engraulidae) in Poyang Lake
摘要
Abstract
Coilia ectenes is an anadromous species and Poyang Lake has been a critical spawning ground in the Yangtze River basin.However, in recent years, the Coilia ectenes resource in the Poyang Lake has decreased sharply.In this study, the reproductive characteristics and condition of the Poyang Lake population were studied to provide basic data for decision making on fishery resource development and utilization, as well as the protection and sustainable development of Coilia ectenes resources in Poyang Lake.A field survey was conducted in Poyang Lake and the Balijiang Section of the Yangtze River (Hukou County) from April to July of 2013 and 2014.A total of 658 specimens were obtained using stationary fishing nets, drift-gill nets and trawl nets.Biological parameters of the specimens were measured, including body length (±0.1 mm), body weight, net weight (±0.1 g), gonad weight (±0.1 mg) and gender.Female Coilia ectenes in stages Ⅲ-Ⅴ were randomly selected and their eggs were counted to determine absolute and relative fecundity.The body length and body weight ranges of the specimens (female: 287, male: 371) were, respectively, 18.6-38.1 cm and 16.3-198.2 g and averaged (24.12±3.14) cm and (44.15±21.42) g.The body length and weight of female Coilia ectenes were greater than those of the males and the differences were highly significant (P<0.01).The weight of females was greater than that of males of the same length and the relative difference increased with length.There was a highly significant positive correlation in both genders between gonad weight and body weight (P<0.01).During the survey, we found that the ovary of Coilia ectenes developed unevenly though middle and late June.Eggs could be squeezed from some female Coilia ectenes (late stage IV and stage V), while others were still at early stage IV, although individuals with a maturation coefficient below 2.0 had dramatically decreased.The range of absolute fecundity of Coilia ectenes in Poyang Lake was 960-13 820 granules and the relative fecundity range was 123.4-753 eggs/g.The average fullness range of the Coilia ectenes population was 0.19-0.45 [average: (0.30±0.03)] and the female-male ratio was 1 ∶1.25-1.44.Overall, the breeding population of Coilia ectenes has been diminished by unsustainable use of the resource.关键词
鄱阳湖/刀鲚/生殖特征Key words
Poyang Lake/Coilia ectenes/reproductive characteristics分类
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贺刚,方春林,吴斌,傅培峰,张燕萍,周辉明,王生,王庆萍..鄱阳湖刀鲚生殖群体特征及状况分析[J].水生态学杂志,2017,38(3):83-88,6.基金项目
赣鄱英才555工程项目(赣财教指[2012]213号). （赣财教指[2012]213号）
