The commercial exploitation of a protected anadromous species, the river lamprey (Lampetra fluviatilis (L.)), in the tidal River Ouse, north-east England
The commercial exploitation of a protected anadromous species, the river lamprey (Lampetra fluviatilis (L.)), in the tidal River Ouse, north-east England
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DOI：
10.1002/aqc.686
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发表时间：
2006
影响因子：
2.4
通讯作者：
J. Masters;M. Jang;K. Ha;P. Bird;P. Frear;M. Lucas
中科院分区：
文献类型：
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作者：
J. Masters;M. Jang;K. Ha;P. Bird;P. Frear;M. Lucas
1. 在过去的几个世纪里，由于人类活动，整个欧洲溯河产卵的鱼类和七鳃鳗的数量有所减少。河七鳃鳗 Lampetra Fluviatilis 是此类物种的代表，并被列入国际保护协议。 2. 可以获得英格兰东北部乌斯潮汐区七鳃鳗商业捕捞量的历史数据（1908-09 至 1913-14）和现代数据（1995-96 至 2003-04）。 2003-04 年间，达勒姆大学在商业渔业下游运营了更多诱捕器。 3. 现代商业渔业的每单位努力捕获量（CPUE）在不同的捕捞季节之间表现出相当大的差异，从 2000-01 年每个诱捕器每天 0.5 只七鳃鳗的 CPUE 中位数到 2003-04 年每个诱捕器每天 22.3 只七鳃鳗的 CPUE 中位数不等。 4. 历史悠久的渔业中每个季节的成年七鳃鳗估计捕获量在 25 500 尾（1913-14 年）和 54 500 尾（1910-11 年）之间。最近的捕捞量往往较小，最少捕获 9083 只七鳃鳗（2000-01 年），最多捕获 30 992 只七鳃鳗（2003-04 年）。 5.CPUE随着放电量的增加而增加，直到超过该点时CPUE随着放电量的进一步增加而下降。洄游活动在高流量时可能会减少，而在低流量时不会受到刺激，尽管在高流量时陷阱本身的捕捞效率可能会降低。 6. 对大学陷阱中捕获的七鳃鳗样本进行标记并释放。根据重新捕获的数量，整个捕捞季节商业诱捕器的绝对最低相对开发水平估计为 9.9%。产卵数量的减少对未来补充的影响目前尚不清楚。 7. 乌斯潮汐区的七鳃鳗种群可能受到无节制的捕捞活动增加的威胁。需要修改现行立法以实现有效的渔业管理。版权所有 © 2006 约翰·威利父子有限公司
1. Throughout Europe, populations of anadromous fish and lampreys have declined over the past centuries due to human activities. River lamprey Lampetra fluviatilis are representative of such species and are listed in international conservation agreements. 2. Historic (1908–09 to 1913–14) and modern (1995–96 to 2003–04) data were available on commercial catches of river lampreys in the tidal Ouse, north-east England. During 2003–04, additional traps were operated by the University of Durham, downstream of the commercial fishery. 3. Catch per unit effort (CPUE) in the modern commercial fishery showed considerable variation between fishing seasons, ranging from a median CPUE of 0.5 lampreys per trap per day in 2000–01 to a median of 22.3 lampreys per trap per day in 2003–04. 4. The estimated catch of adult river lampreys each season in the historic fishery ranged between 25 500 (1913–14) and 54 500 (1910–11). Recent catches tended to be smaller, with a minimum catch of 9083 lampreys (2000–01) and a maximum of 30 992 lampreys (2003–04). 5. CPUE increased with discharge, up to a point above which CPUE declined with further increase in discharge. Migratory activity may be reduced at high flows and not stimulated at low flows, although the fishing efficiency of the traps themselves was probably reduced during high flows. 6. Samples of river lampreys caught in the university's traps were marked and released. Based upon the number of recaptures, the absolute minimum relative exploitation level of the commercial traps, over the whole fishing season, was estimated as 9.9%. The effect of such a reduction in the spawning population upon future recruitment is at present unknown. 7. The population of river lampreys in the tidal Ouse is potentially threatened by an unregulated increase in fishing effort. Current legislation needs to be modified to allow effective fishery management. Copyright © 2006 John Wiley & Sons, Ltd.