水生态学杂志2017，Vol.38Issue(6)：82-87,6.DOI:10.15928/j.1674-3075.2017.06.011
鄱阳湖刀鲚的渔汛特征及渔获物分析
Changes in the Fishing Season and Daily Catch of Coilia ectenes in Poyang Lake
摘要
Abstract
Coilia ectenes is an anadromous fish with high economic and ecological values in the middle and lower Yangtze River and adjoining waters.Poyang Lake, vital habitat of C.ectenes, is important for spawning and repro-duction.The capture size and population characteristics of C.ectenes in the Yangtze River have been reported, but the current resource status of C.ectenes in Poyang Lake during fishing season is not well documented.In this study, the fishery resource status of C.ectenes was investigated monthly in three areas of Poyang Lake ( Poyang Lake estuary, Duchang and Yugan) from December 2013 to November 2014.The relationship between C.ectenes population and hydrological factors was analyzed, aiming to understand the population characteristics of C.ectenes during fishing season and to explore the factors driving population changes in Poyang Lake.The study provides base data for conserving wild C.ectenes populations.The investigation was conducted using fixed nets ( mesh size:1 cm), gill nets (mesh size:1 cm) and trawling (mesh size:1.5 cm), along with data on the daily catch per fish-ing vessel.The body length and weight of each specimen were measured.A total of 986 C.ectenes specimens were collected with a total weight of 41.54 kg.During the investigation, data on water level and runoff at Poyang Lake estuary and Jiujiang section were recorded each day.The relationship between fish catch per boat( WB) and hydro-logical factors in Poyang Lake estuary was analyzed by Pearson correlation.The body length range of C.ectenes was 17.9-38.1 cm and the range 21.2-23.6 cm accounted for 37.02 % of the total.The body weight range was 14.3-198.2 g and the range 25-40 g accounted for 57.20%of the total.The relationship between body weight and body length of C.ectenes in Poyang Lake is given by the equation, W=0.0019L3.1378 ( R2 =0.8997,n=986, P<0.01).In the Poyang Lake estuary, C.ectenes emerged mainly from May to June, peaking in June and rarely spotted in July.Both the daily catch per boat(NB), (3.2 ±4.1) ind/d and total weight per boat(WB), (0.12 ± 0.11) kg/d were significantly and positively correlated with water level and runoff (P<0.05).Compared with historical data, C.ectenes in Poyang Lake have become smaller and the fishing season is shorter and occurs later. The C.ectenes resource in Poyang Lake has decreased dramatically.关键词
刀鲚/渔汛/渔获物/鄱阳湖Key words
Coilia ectenes/fishing season/fish catch/Poyang Lake分类
生物科学引用本文复制引用
王生,方春林,周辉明,贺刚,张燕萍,傅培峰,吴斌,王庆萍..鄱阳湖刀鲚的渔汛特征及渔获物分析[J].水生态学杂志,2017,38(6):82-87,6.基金项目
农业部长江中上游渔业资源环境重点野外科学观测试验站(YWTZ/2014-01) （YWTZ/2014-01）
赣鄱英才555工程刀鲚调查专项基金(赣财教指[2012]213号) （赣财教指[2012]213号）
江西省科技支撑项目(20141BBF60036). （20141BBF60036）
