In situ study on the control of toxic Microcystis blooms using phytoplanktivorous fish in the subtropical Lake Taihu of China:: A large fish pen experiment
In situ study on the control of toxic Microcystis blooms using phytoplanktivorous fish in the subtropical Lake Taihu of China:: A large fish pen experiment
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中国亚热带太湖食浮游植物鱼控制有毒微囊藻水华的现场研究：大型鱼栏实验
DOI：
10.1016/j.aquaculture.2007.01.049
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发表时间：
2007-05-01
期刊：
影响因子：
4.5
通讯作者：
Yang, Hua
中科院分区：
文献类型：
--
作者：
Ke, Zhixin;Xie, Ping;Yang, Hua
在梅梁湾设置了3个大型养鱼围栏，每个围栏0.36 km（2），放养银和鳙鱼，以控制有毒微囊藻水华。研究了浮游生物群落结构和银、鳙鱼摄食量的响应。甲壳类浮游动物的鱼围栏显着抑制。养鱼围栏中浮游植物总生物量、微囊藻生物量和微囊藻毒素浓度均低于周围湖水，但差异不显著。目前银鲤加鳙鱼的放养密度（7月份约为40 g/m3）可能太低，无法达到充分控制微囊藻的目的。银主要以浮游植物为食，而鳙鱼主要以浮游动物为食：银和鳙鱼肠道中浮游动物的平均贡献率分别为31.5%和64.7%。与以往的研究相比，这两种鲤鱼的食物资源丰富，捕食浮游动物更多。用Egger模型估算了主生长季银鲤和鳙鱼的日摄食量。滤水率由日摄食量和浮游生物密度计算。5 ~ 10月，银和鳙鱼对浮游植物的过滤速率分别为0.22-1.53 L g（-1）h（-1）和0.02-0.68 L g（-1）h（-1），对浮游动物的过滤速率分别为0.24-0.44 L g（-1）h（-1）和0.08-1.41 L g（-1）h（-1）。银对浮游植物的清除能力强于鳙鱼。为使生物丰年化养殖的成功率和对鱼类富营养化的影响最小化，在今后的养殖实践中应控制好鳙鱼的放养比例。(c)2007 Elsevier B.V保留所有权利。
Three large fish pens (0.36 km(2) of each) stocked with silver and bighead carp were set up in Meiliang Bay for controlling toxic Microcystis blooms. The responses of plankton communities and food consumption of silver and bighead carp were studied. Crustacean zooplankton were significantly suppressed in the fish pens. Total phytoplankton biomass, Microcystis biomass and microcystin concentration were lower in the fish pens than in the surrounding lake water, but the difference was not statistically significant. The present stocking density of silver plus bighead carp (about 40 g/m(3) in July) was likely too low to achieve an adequate control of Microcystis. Silver carp fed mainly on phytoplankton but bighead carp mainly on zooplankton: mean zooplankton contribution in the gut was 31.5% for silver carp and 64.7% for bighead carp. Compared with previous studies, both carp species preyed upon more zooplankton because of the abundant food resource. Daily rations of silver and bighead carp were estimated by Egger's model in the main growing season. Filtration rate was calculated from the daily ration and the density of plankton in the lake. During May-October, filtration rates of silver and bighead carp for phytoplankton were 0.22-1.53 L g(-1) h(-1) and 0.02-0.68 L g(-1) h(-1), respectively, and filtration rates for zooplankton were 0.24-0.44 L g(-1) h(-1) and 0.08-1.41 L g(-1) h(-1), respectively. Silver carp had a stronger ability of eliminating phytoplankton than bighead carp. To achieve a successful bioniampulation with a minimum effect of ichthyoeutrophication, the stocking proportion of bighead carp should be controlled in the future practice. (c) 2007 Elsevier B.V All rights reserved.