| 摘要: |
| 通过建立模型估算了柘林湾网箱养殖因投饵所产生的环境氮磷总负荷及不同来源、形式的氮磷负荷组成。结果显示, 2006 年柘林湾网箱养殖因投喂冰鲜鱼饵料产生的氮负荷为2 760.39 t、磷负荷为679.11 t, 其中残饵氮1 695.24 t, 占氮负荷的61.4%, 残饵磷441.36 t, 占磷负荷的65.0%, 残饵是构成氮磷负荷的主要组成。对源自残饵的氮磷负荷进一步分析发现残饵鱼体软组织在残饵氮中所占的比重最大为768.62 t, 而残饵骨在残饵磷负荷中所占比重最大为241.73 t。氮磷负荷按其状态分: 固态氮为1 717.38 t, 占氮负荷的62.2%, 溶解态氮为1 043.01 t, 约占氮负荷的37.8%; 固态磷为595.15 t, 占磷负荷的87.6%, 溶解态磷为83.96 t, 占磷负荷的12.4%。 |
| 关键词: 柘林湾 网箱鱼类养殖 残饵 氮磷负荷 |
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| 基金项目:广东省重大科技专项(2007A032600004); 广东省海洋渔业科技推广专项(A200899J01) |
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| Nitrogen and phosphorus loading from fish cage culture in Zhelin Bay |
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| Abstract: |
| This study assessed the sum, sources, and forms of nitrogen and phosphorus loading produced by cage-cultured fish in Zhelin Bay. The results showed that in 2006 fish cultured with the feed of trash fish produced 2 760.39 tons of nitrogen loading, which included uneaten nitrogen 1 695.24 tons -accounting for 61.4% of nitrogen loading, and 679.11 tons of phosphorus loading, 441.36 tons of which were uneaten phosphorus, accounting for 65.0% of phosphorus loading. The analysis of the sources of uneaten food indicated that 768.62 tons nitrogen in the soft tissues of trash fish accounted for the largest proportion in the uneaten nitrogen, while 241.73 tons phosphorus in the bones of trash fish accounted for the largest proportion in the uneaten phosphorus. The amounts of different forms of nitrogen and phosphorus loading were estimated. Solid nitrogen, dissolved nitrogen, solid phosphorus, and dissolved phosphorus were 1 717.38, 1 043.01, 595.15, and 83.96 tons, respectively, accounting for 62.2% of nitrogen loading, 37.8% of nitrogen loading, 87.6% of phosphorus loading, and 12.4% of phosphorus loading, respectively. |
| Key words: Zhelin Bay fish cage culture uneaten food nitrogen and phosphorus loading |
