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引用本文:施炜纲,王博,周昕.蟹、鱼网围混养对草型湖泊氮磷平衡的影响.湖泊科学,1999,11(4):363-368. DOI:10.18307/1999.0413
SHI Weigang,WANG Bo,ZHOU Xin.Effects of Pen Fish and Crab Polyculture on Burden of Nitrogen and Phosphorus in Aquatic Environment of Weed-type Lakes. J. Lake Sci.1999,11(4):363-368. DOI:10.18307/1999.0413
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蟹、鱼网围混养对草型湖泊氮磷平衡的影响
施炜纲, 王博, 周昕
中国水产科学研究淡水渔业研究中心, 无锡 214081
摘要:
研究了草型湖泊(东太湖)蟹、鱼网围混养对水域中氮、磷平衡的影响对养殖过程 中氮、磷的输入输出测算表明:利用该养殖模式进行生产,不仅不会加重水域中的氮、磷负荷量,相 反还可以从水域环境中吸收一部分氮、磷在整个养殖过程中,由于投放蟹、鱼种和饲料形成的氮、磷输入分别为27.889kg·h m-2和4.381kg·h m-2,而起捕蟹、鱼导致的氮、磷输出分别为41.177kg·h m-2和5.081kg·h m-2,可以从湖泊中吸氮、磷量分别为13.288kg·h m-2和1.420kg·h m-2该养殖 模式还具有理想的经济效益,对水生生物群落的影响亦较小,符合可持续发展的要求。
关键词:  网围  氮、磷平衡  太湖  影响
DOI:10.18307/1999.0413
分类号:
基金项目:农业部“九五”科技攻关项目“浅水草型湖泊规模化养殖技术研究”(96-008-02-01)
Effects of Pen Fish and Crab Polyculture on Burden of Nitrogen and Phosphorus in Aquatic Environment of Weed-type Lakes
SHI Weigang, WANG Bo, ZHOU Xin
Freshwater Fisheries Research Center of CAFS, Wuxi 214081
Abstract:
Pen culture has been widely developed in most frestwater lakes in China and a higher fish yield of 7500 kg/hm2 was achieved in some grass-type lakes during the implementation of the 8th Five-year Plan. In East Taihu Lake, the fish yield has now kept increasing with the increase of stocking fingerlings, feeding rate and collecting aquatic weeds, but such practice leads to the unbalance of nitrogen and phosphorous budget and causes a negative impact on the aquatic environment. However, it is somewhat difficult for the government to conduct an effective measurement to control the practice for the time being because of its benefits for the fish farmers. Hence, it is necessarily important to study the ecological practice of pen culture in the grass-type lakes for the proper maintenance of natural resources and protection of the benefits of fish farmers. The study was conducted in Miaoguan, East Taihu Lake with a total pen area of 10 hectare (hm2), where crab and fish were polycultured. In this study, both nitrogen and phosphorous elements were negatively increased through the proper control of feed loading during the culture period . This practice was considered as an ecological cultural model for the sustainable aquaculture development in lakes. The experiment was conducted to study the effects of polyculturing fish with crab in pens on the level of nitrogen and phosphorous in the lake water. With the calculation of input and output of nitrogen and phosphorous during the culture, the experimental results show that the model of polyculture of with crab in pens did not increase the level of nitrogen and phosphorous in the lake water, but it partially reduced their levels instead. During the whole production season, the input of nitrogen and phosphorous by both stocking of fish and crab seeds and loading of feed was 27. 889kg·hm-2 and 4.381 kg·hm-2, respectively; while the output of nitrogen and phosphorous by harvesting of fish and crab was 41.177 kg·hm-2 and 5.801 kg·hm-2, respectively. As a result, the level of nitrogen and phosphorous could be reduced at a rate of 13.288 kg·hm-2 and 1.420 kg·hm-2, respectively from pen culture in the lake. In conclusion, such culture model may result in ideal economic efficiency, low impact on the community of aquatic organisms, thus favoring the sustainable development of pen culture in lakes.
Key words:  Pen culture  level of nitrogen and phosphorous  Taihu Lake  impact
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