水生态学杂志2017，Vol.38Issue(3)：66-74,9.
老虎潭水库鱼类群落结构特征、营养等级及鲢、鳙生长特性研究
Characterization of the Hypophthalmichthys molitrix and Aristichthys nobilis Communities and Assessment of Trophic Status in Laohutan Reservoir
摘要
Abstract
Laohutan Reservoir, located in Huzhou City of Zhejiang Province, is the primary drinking water source of Huzhou City.In 2011, the fish community was altered to slow the eutrophication rate of Laohutan Reservoir by releasing filter-feeding and detritivorous fish.In this study, we characterized the fish community, the status of fish resources and eutrophication, and measured growth rates of the primary fish in Laohutan Reservoir.The objective was to provide data to improve biological control of water quality.In February, May, August and November of 2015, a systematic fishery investigation was conducted in the reservoir.Fish samples were collected using different sized fishing nets and all fish collected were weighted and identified.The age of Aristichthys nobilis and Hypophthalmichthys molitrix were determined by counting scale annuli.Aquatic snails, phytoplankton, zooplankton and organic detritus samples were also collected.To understand the trophic level of fish in Laohutan Reservoir, stable isotope data (δ15N and δ13C) for 28 aquatic animals was collected in May, including two base food sources and 26 consumers.A total of 35 fish species were collected, belonging to 4 orders and 9 families.Among them, Cyprinidae (28 species) accounted for 80 % of the species, followed by Siluriformes (3 species), Perciformes (3 species) and Synbranchiformes (1 species), accounting for 8.6%, 8.6% and 2.8% of the total fish species, respectively.Six dominant fish species were identified based on the index of relative importance: Aristichthys nobilis, Hypophthalmichthys molitrix, Culter alburnus, Carassius auratus, Xenocypris davidi and Hemiculterlla wu.The growth rate equations for total length and weight for H.molitrix were Lt=110.533[1-e-0.386(t+0.227)], Wt=25.138[1-e-0.265(t+0.136)]3.118 and, for A.nobilis, Lt=93.042[1-e-0.415(t+0.223)],Wt=12.257[1-e-0.415(t+0.223)]2.756.The highest weight growth rate for both species occurred during years 1-3, and then decreased gradually, with the growth inflexion points at the age of 2.721 and 2.223, respectively.To achieve the maximum water quality benefit by H.molitrix and A.nobilis, the catchable age should be set at 3 years.Stable carbon and nitrogen isotope analysis shows that the ranges of δ13C and δ15N values for the two base food sources were-28.99‰-24.32‰ to and 5.06‰-8.19‰, respectively, with higher δ13C and δ15N values for phytoplankton than for organic debris.The δ13C and δ15N values of 26 consumers varied respectively from-27.07‰ to-20.42‰ and from 8.93‰ to 1488‰, with an average value of (-24.76±1.54)‰ and (12.03±1.47)‰.The trophic level among the 26 consumers varied from 2.18 to 3.61, indicating two levels and consistent with known feeding characteristics.关键词
鱼类群落结构/营养等级/生长模型/稳定同位素/老虎潭水库Key words
fish community characterization/trophic levels/growth model/stable isotope/Laohutan Reservoir分类
生物科学引用本文复制引用
辛建美,原居林,储忝江,杨元杰,孙翠萍,顾志敏..老虎潭水库鱼类群落结构特征、营养等级及鲢、鳙生长特性研究[J].水生态学杂志,2017,38(3):66-74,9.基金项目
公益性行业(农业)科研专项(编号201303056-4) （农业）
湖州市科学技术局公益性技术应用研究(重点)(2014GZ03). （重点）
