| 达里湖瓦氏雅罗鱼资源现状及合理利用探讨 |
| Utilization Status of Leucisus waleckii(Dybowski) Dali Lake and Its Rational Exploitation |
| 投稿时间：2010-08-13 修订日期：2010-10-11 |
| DOI： |
| 中文关键词:瓦氏雅罗鱼 资源现状 合理利用 达里湖 |
| 英文关键词:Leucisus waleckii resources status rational exploitation Dali Lake |
| 基金项目:内蒙古自治区“十五”重点攻关项目 |
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| 中文摘要: |
| 采用2008年12月和2009年12月在达里湖获取的瓦氏雅罗鱼(Leucisus waleckii)样品,对其基础生物学进行测定,依据B-H模型,计算并分析在不同开捕年龄和不同捕捞强度下的单位补充渔获量(YN/R和Yw/R)及渔获质量(平均体重Wy、平均全长TLy和平均年龄Ty)。结果表明,达里湖瓦氏雅罗鱼的生长参数K、TL∞、t0分别为0.1437a-1、38.77cm和-0.5572a;目前开捕年龄和捕捞强度分别为3.52a和0.5256;若保持当前开捕年龄,目前的捕捞强度即可;若保持目前捕捞强度,则开捕年龄可提高到6龄;瓦氏雅罗鱼资源利用不合理之处为大量捕捞4龄以内的鱼,为了合理开发利用和保护达里湖瓦氏雅罗鱼,在当前捕捞强度下,应将开捕年龄应限制在6龄,对应的全长为24cm,体重为126g。 |
| 英文摘要: |
| Based on the samples from December 2002 to December 2003 in Dali Lake，Leucisus waleckii's age and growth were studied by observing Leucisus waleckii's scale and measuring their biological characters. The relation between total length and weight，W=0. 0076 TL3.0593(r2=0. 9667)，was got by regression. The growth equations described by von Bertalanffy equation were TLt=38. 77[1 –e -0.1437(t+0.5572)] .Other parameters of B一H model were got by the following methods :firstly，based on passed data the maximum age(tλ)of Leucisus waleckii was 12a; secondly，based on present data it was got that recruit age(tr)and first capture(tc)were both 3.52a ; third1y, by Pauly's experiment equation the nature mortality coefficient(M) was 0.2655; finally，total mortality coeffcient Z=0. 7911 was got by averaging the results of two methods，and the fishing mortality coefficient F=0. 5256 was got by equation F=Z一M. After all the necessary parameters were got，B-H model is adopted to analyze catchweight and numbers per recruit(YN/R and YW/R)，annually average body weight(Wy)，total lenght(TLy)and age(Ty).The results show that exploitation of the stock was unrational due to catches of large proportions of 3 age and 4 age，although the stocks could sustain high fishing pressure. It is suggested that，to protect and exploit this resource rationally，if the current fishing intensity is kept，the age at the first capture is increased to 6 age (24 cm in total length，126g in weight) . |
| 齐景伟,安晓萍,孟和平,杜昭宏,乌 兰,高玉奎,柳玉海.2011.达里湖瓦氏雅罗鱼资源现状及合理利用探讨[J].水生态学杂志,32(1):71-77. |
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