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杨鑫, 李大鹏, 邵俭, 谢从新, 刘香江, 霍斌. 雅鲁藏布江双须叶须鱼种群资源现状及其渔业管理对策[J]. 水生生物学报, 2020, 44(1): 170-179. DOI: 10.7541/2020.020
引用本文: 杨鑫, 李大鹏, 邵俭, 谢从新, 刘香江, 霍斌. 雅鲁藏布江双须叶须鱼种群资源现状及其渔业管理对策[J]. 水生生物学报, 2020, 44(1): 170-179. DOI: 10.7541/2020.020
YANG Xin, LI Da-Peng, SHAO Jian, XIE Cong-Xin, LIU Xiang-Jiang, HUO Bin. POPULATION RESOURCES AND FISHERY MANAGEMENT POLICIES OF PTYCHOBARBUS DIPOGON IN THE YARLUNG ZANGBO RIVER[J]. ACTA HYDROBIOLOGICA SINICA, 2020, 44(1): 170-179. DOI: 10.7541/2020.020
Citation: YANG Xin, LI Da-Peng, SHAO Jian, XIE Cong-Xin, LIU Xiang-Jiang, HUO Bin. POPULATION RESOURCES AND FISHERY MANAGEMENT POLICIES OF PTYCHOBARBUS DIPOGON IN THE YARLUNG ZANGBO RIVER[J]. ACTA HYDROBIOLOGICA SINICA, 2020, 44(1): 170-179. DOI: 10.7541/2020.020

雅鲁藏布江双须叶须鱼种群资源现状及其渔业管理对策

POPULATION RESOURCES AND FISHERY MANAGEMENT POLICIES OF PTYCHOBARBUS DIPOGON IN THE YARLUNG ZANGBO RIVER

  • 摘要: 双须叶须鱼(Ptychobarbus dipogon)为雅鲁藏布江水系特有种,由于酷渔滥捕和外来种入侵等因素,其种质资源衰退严重。2008年10月至2009年9月、2012年4月至7月和2013年3月于雅鲁藏布江拉孜至尼木江段共捕捞双须叶须鱼956尾,采用单位补充量模型对其资源现状及管理措施进行了评估。结果表明:雌鱼种群的年总瞬时死亡率(Z)为0.52/年,雄鱼种群的年总瞬时死亡率(Z)为0.70/年,雌鱼种群自然死亡系数(M)和当前捕捞死亡系数( Fcur)范围分别为0.10—0.17/年和0.35—0.42/年,雄鱼种群自然死亡系数(M)和当前捕捞死亡系数(Fcur)范围分别为0.14—0.24/年和0.46—0.56/年。双须叶须鱼雌性和雄性种群的产卵潜力比(SPR)范围分别为3.1%—6.7%和9.8%—18.2%,均不高于下限参考点(25%)。这说明当前的管理政策不能对双须叶须鱼进行有效的保护,其种群处于过度利用状态。通过评估14个渔业管理措施对双须叶须鱼种群资源的保护效果,发现将起捕年龄提高至不小于15龄或禁渔期至少设置为2—6月,可有效地对其种质资源进行保护。

     

    Abstract: Ptychobarbus dipogon is endemic to China and has been threatened by overfishing and biological invasion. To examine 956 individuals collected from Lhaze to Nyemo of Yarlung Zangbo River, the population resources and fishery management policies of this species were studied by using per-recruit models from October 2008 to September 2009, April 2012 to July 2012 and in March 2013 respectively. The total instantaneous annual mortality (Z) for female and male P. dipogon was 0.52/year and 0.70/year, respectively. The range of natural mortality (M) and current fishing mortality (Fcur) for females were 0.10—0.17/year and 0.35—0.42/year. The range of natural mortality (M) and current fishing mortality (Fcur) for males were 0.14—0.24/year and 0.46—0.56/year. The range of spawning potential ratio of P. dipogon was 3.1%—6.7% for females and 9.8%—18.2% for males, both of which were all significantly lower than the threshold reference point (25%). These results indicated that the stock of P. dipogon had been over-exploited under the current fishery management policy. To evaluate protective effect of capture age and seasonal closure, 14 different fishery management policies were simulated. The results show that raising the fishing age to not less than 15 years or setting the season closure time from February to June can effectively protect the population of the diagonal nematode.

     

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