Sustainable fisheries in shallow lakes:an independent empirical test of the Chinese mitten crab yield model  

作　　者：王海军 梁小民 王洪铸 

机构地区：[1]State Key Laboratory ofFreshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Sciences

出　　处：《Chinese Journal of Oceanology and Limnology》2017年第4期894-901,共8页中国海洋湖沼学报（英文版）

基　　金：Supported by the State Key Laboratory of Freshwater Ecology and Biotechnology(Nos.2014FB14,2011FBZ14);the Hubei Province(No.2001AA201A05);the National Basic Research Program of China(973Program)(No.2008CB418006);the Chinese Academy of Sciences(No.KZCX1-SW-12);supported by the Youth Innovation Association of Chinese Academy of Sciences(No.2014312)

摘　　要：Next to excessive nutrient loading,intensive aquaculture is one of the major anthropogenic impacts threatening lake ecosystems.In China,particularly in the shallow lakes of mid-lower Changjiang(Yangtze) River,continuous overstocking of the Chinese mitten crab(Eriocheir sinensis) could deteriorate water quality and exhaust natural resources.A series of crab yield models and a general optimum-stocking rate model have been established,which seek to benefit both crab culture and the environment.In this research,independent investigations were carried out to evaluate the crab yield models and modify the optimum-stocking model.Low percentage errors(average 47%,median 36%) between observed and calculated crab yields were obtained.Specific values were defined for adult crab body mass(135 g/ind.) and recapture rate(18%and 30%in lakes with submerged macrophyte biomass above and below 1 000 g/m^2)to modify the optimum-stocking model.Analysis based on the modified optimum-stocking model indicated that the actual stocking rates in most lakes were much higher than the calculated optimum-stocking rates.This implies that,for most lakes,the current stocking rates should be greatly reduced to maintain healthy lake ecosystems.Next to excessive nutrient loading, intensive aquaculture is one of the major anthropogenic impacts threatening lake ecosystems. In China, particularly in the shallow lakes of mid-lower Changjiang （Yangtze） River, continuous overstocking of the Chinese mitten crab （Eriocheir sinensis） could deteriorate water quality and exhaust natural resources. A series of crab yield models and a general optimum-stocking rate model have been established, which seek to benefit both crab culture and the environment. In this research, independent investigations were carried out to evaluate the crab yield models and modify the optimum-stocking model. Low percentage errors （average 47%, median 36%） between observed and calculated crab yields were obtained. Specific values were defined for adult crab body mass （135 g/ind.） and recapture rate （18% and 30% in lakes with submerged macrophyte biomass above and below 1 000 g/m^2） to modify the optimum-stocking model. Analysis based on the modified optimum-stocking model indicated that the actual stocking rates in most lakes were much higher than the calculated optimum-stocking rates. This implies that, for most lakes, the current stocking rates should be greatly reduced to maintain healthy lake ecosystems.

关 键 词：Chinese mitten crab sustainable fishery yield model optimum-stocking model independent test Changjiang lakes 

分 类 号：S966.16[农业科学—水产养殖] S165.27[农业科学—水产科学]