淀山湖刀鲚的生物学参数估算及其相对单位补充量渔获量

应用生态学报

淀山湖刀鲚的生物学参数估算及其相对单位补充量渔获量

高春霞^1,2,田思泉^1,2,3**,戴小杰^1,2,3

(¹上海海洋大学海洋科学学院, 上海 201306； ^2上海海洋大学大洋渔业资源可持续开发省部共建教育部重点实验室，上海 201306； ^3上海海洋大学农业部大洋渔业资源环境科学观测实验站，上海201306)

出版日期:2014-05-18 发布日期:2014-05-18

Estimation of biological parameters and yield per recruitment for Coilia nasustaihuensis in Dianshan Lake, Shanghai, China.

GAO Chun-xia^1,2, TIAN Si-quan^1,2,3, DAI Xiao-jie^1,2,3

(¹College of Marine Sciences, Shanghai Ocean University, Shanghai 201306, China; ^2Key Laboratory of Oceanic Fisheries Resources Exploitation of Shanghai Education Commission, Shanghai Ocean University, Shanghai 201306, China; ^3Ministry of Agriculture Scientific Observing and Experimental Station of Oceanic Fishery Resources, Shanghai Ocean University, Shanghai 201306, China)

Online:2014-05-18 Published:2014-05-18

摘要/Abstract

摘要： 刀鲚是淀山湖水域内资源丰度最高的鱼类，在该湖泊的生态系统中处于重要地位.本文根据2010年7月至2011年8月在淀山湖水域采集的3107尾刀鲚的长度频率数据，利用ELEFAN I技术对刀鲚的生长和死亡参数进行估算，并根据BevertonHolt动态综合模型评估刀鲚资源变动趋势.结果表明： von Bertalanffy生长方程描述的刀鲚生长参数为L_∞=35.70 cm, k=0.54，t₀=-0.48 a，体质量的生长拐点年龄为1.37 a.采用Pauly经验公式估算出刀鲚的自然死亡系数M=0.872.采用长度变换渔获曲线法估算刀鲚的总死亡系数Z=2.121，捕捞死亡系数F=1.249，当前开发率E=0.589，表明资源已处于过度开发状态.根据Beverton-Holt动态综合模型，建议最适的开捕体长应为21.42 cm，对应开捕年龄为1.22 a.

Abstract: Coilia nasustaihuensis is the most abundant species in Dianshan Lake and plays an important role in the lake ecosystem. From July 2010 to August 2011, a total of 3107 samples of C. nasustaihuensis were collected from Dianshan Lake. Based on length data of these samples, ELEFAN I technique was employed to estimate growth and mortality parameters, and the Beverton-Holt dynamic model was used to evaluate the population dynamics trend for C. nasustaihuensis. Growth of this species was described using a von Bertalanffy model, and the estimated parameters were L_∞=35.70 cm, k=0.54, and t₀=-0.48 a. The turning point for body mass growth curve of the stock was situated at t=1.37 a. Natural mortality coefficient M was then estimated using Pauly’s empirical equation and found to be 0.872. Lengthconverted catch curves were used to estimate the total mortality coefficient Z, which was found to be 2.121. Accordingly, the fishing mortality coefficient (F) was equal to 1.249, and the current exploitation rate was 0.589, suggesting the stock was overexploited. According to the BevertonHolt dynamic model, the minimum capture size for C. nasustaihuensis should be 21.42 cm (age 1.22 years).

高春霞1,2,田思泉1,2,3**,戴小杰1,2,3. 淀山湖刀鲚的生物学参数估算及其相对单位补充量渔获量[J]. 应用生态学报.

GAO Chun-xia1,2, TIAN Si-quan1,2,3, DAI Xiao-jie1,2,3. Estimation of biological parameters and yield per recruitment for Coilia nasustaihuensis in Dianshan Lake, Shanghai, China.[J]. Chinese Journal of Applied Ecology.