水生态学杂志Issue(3)：51-55,5.DOI:10.15928/j.1674-3075.2015.03.008
鄱阳湖通江水道短颌鲚生长特性初探
Growth Characteristics of Coilia brachygnathus in the Poyang Lake-Yangtze River Waterway
摘要
Abstract
Poyang Lake is the largest seasonal fresh water lake in China and its fish resources are rich .However , shallow water , the short water cycle and the large difference in water area from wet to dry season results in poor sta-bility and this lack of resilience puts the fish resources at risk .The water conservancy project on the Poyang Lake has played an important role in maintaining the ecology of Poyang Lake and has benefited economic development in the Poyang Lake area , but it has also produced negative impacts on water quality and quantity , and on the fishery . Scientific , efficient assessment of fish resources supports environmental protection of Poyang Lake .As part of a fish resource study in the Poyang Lake-Yangtze River waterway , we analyzed biological parameters and growth charac-teristics of Coilia brachygnathus using FiSAT II software.From March, 2012 to February, 2013, monthly sampling of C.brachygnathus was carried out using a fixed net in the Pingfeng section of the waterway .From December, 2013 to November, 2014, monthly sampling of C.brachygnathus was carried out in the estuarine section by gill net, fixed net and trawl net.A total of 1 403 individuals (18.8 kg) of C.brachygnathus were obtained.Body length and mass were measured and the relationship of body mass and length and other biological parameters related to growth characteristics of C.brachygnathus population were calculated .The body length of C.brachygnathus spec-imens collected ranged from 5.6 cm to 32.5 cm, with an average length of 14.3 cm, and the body mass ranged from 0.6 g to 125.5 g, with an average mass of 13.4 g.The relationship between body length ( cm) and body mass (g) was described by the equation:W=0.003L3.022(R=0.985;P<0.05;n=1403).The growth pattern of C. brachygnathus was described by the von Bertalanffy relationships:L=34.65[(1-e-0.39(t+0.359) ] and W=134.93 [ 1 -e -0.39(t +0.359) ]3; asymptotic length, growth coefficient and theoretical growth starting point were L∞ =34.7 cm,k=0.39,t0 =-0.359.The inflection point for the body weight and body length of C.brachyg-nathus in this study was 38.6 g and 22.8 cm.The average fullness was (0.32 ±0.06), the total mortality coeffi-cient (Z) was estimated as 1.20, natural mortality coefficient (M) was 0.75, fishing mortality coefficient (F) was 0.45 and the exploitation rate of C.brachygnathus was 0.37 in the waterway of the Poyang Lake to the Yangtze River.These results have improved our understanding of C.brachygnathus population dynamics and will support conservation of the species .关键词
短颌鲚/生长特性/鄱阳湖Key words
Coilia brachygnathus/biological parameters/Poyang Lake分类
生物科学引用本文复制引用
吴斌,方春林,傅培峰,熊小英,张燕萍,周辉明,贺刚,王生,王庆萍..鄱阳湖通江水道短颌鲚生长特性初探[J].水生态学杂志,2015,(3):51-55,5.基金项目
鄱阳湖湿地与流域研究教育部重点实验室开放基金（PK2012003）；赣鄱英才555工程刀鲚调查专项基金。 （）
