在格陵兰岛西北部海冰下使用金属板风筝手工延绳钓格陵兰大比目鱼（Reinhardtius hippoglossoides）的情况

IF 2.2 2区农林科学 Q2 FISHERIES

Fisheries Research Pub Date : 2024-10-07 DOI:10.1016/j.fishres.2024.107203

Kenzo Tanaka , Makoto Tomiyasu , Ryo Kusaka , Shin Sugiyama , Evgeny A. Podolskiy , Yasuzumi Fujimori

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引用次数: 0

摘要

了解渔具的部署范围和行为与渔业效率的关系，将有助于我们掌握未来渔业变化对资源和渔业活动的潜在影响。格陵兰大比目鱼的捕捞活动在夏季由船只在开阔水域进行。然而，在冬季，渔民们使用狗拉雪橇前往海冰上的渔场，在冰上钻孔，并使用金属板风筝布放延绳。虽然船式延绳钓和冰上延绳钓的布放规模各不相同，但人们对冰上延绳钓中使用的风筝的运动及其对延绳钓布放范围的影响却不甚了解。我们使用加速度计进行了实验，以确定风筝的水下运动及其对延绳部署水平范围的影响。这是第一份描述海冰下延绳钓具体操作信息的报告，特别是风筝对延绳钓布放的影响。风筝连接在主线的前端，在向海底下移的过程中水平布放延绳。当风筝和主线落入海中时，风筝将钓线水平拉长，同时长线朝前，短线朝前。这种运动类似于飘动，主要受雷诺数和惯性矩的影响。当主线被握住时，风筝以圆周运动的方式下降。随着反复捕鱼作业和时间的推移，由于主线的浮力和张力，预计风筝的运动范围和速度都会减小。这些风筝运动表明，延绳钓的布放范围可以延伸几百米。因此可以推断，由于使用风筝时延绳钓的布放范围有限，冬季冰钓对格陵兰大比目鱼种群的影响相对较小。

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Artisanal longline fishing for Greenland halibut (Reinhardtius hippoglossoides) operated under sea ice using a metal plate kite in northwest Greenland

Understanding the deployment ranges and behavior of fishing gear in relation to fishery efficiency will help us grasp the potential impact of future shifts in the fishery on resources and fishing activities. Fisheries for Greenland halibut are conducted by boat in open water during the summer. However, in winter, fishermen travel to fishing grounds on the sea ice using dog sleds, drill holes in the ice, and deploy longlines using metal plate kites. While the scale of deployment varies between boat and ice longlining, the movement of kites used in ice longlining and their effect on the deployment range of the line is not well understood. We conducted experiments using an accelerometer to determine the underwater movement of kites and their effect on the horizontal range of longline deployment. This is the first report describing specific operational information on longline fishing under sea ice, specifically on the effects of the kite on longline deployment. The kite is attached to the leading end of the mainline and deploys the longlines horizontally as it moves downward towards the sea floor. When the kite and mainline are dropped into the sea, the kite extends the line horizontally while shifting forward-facing long side, and forward-aligned short side. The motion resembles a fluttering action primarily influenced by the Reynolds number and moment of inertia. When the mainline is held, the kite descends in a circular motion. With repeated fishing operations and the passage of time, the kite's movement is expected to decrease in both range and speed due to the buoyancy and tension of the mainline. These kite movements suggest that the deployment range of longlines could extend several hundred meters. Therefore, it can be inferred that the impact of winter ice fishing on the Greenland halibut stock is relatively low due to the limited deployment range of the longline when using the kite.

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来源期刊

Fisheries Research 农林科学-渔业

CiteScore

4.50

自引率

16.70%

发文量

294

审稿时长

15 weeks

期刊介绍： This journal provides an international forum for the publication of papers in the areas of fisheries science, fishing technology, fisheries management and relevant socio-economics. The scope covers fisheries in salt, brackish and freshwater systems, and all aspects of associated ecology, environmental aspects of fisheries, and economics. Both theoretical and practical papers are acceptable, including laboratory and field experimental studies relevant to fisheries. Papers on the conservation of exploitable living resources are welcome. Review and Viewpoint articles are also published. As the specified areas inevitably impinge on and interrelate with each other, the approach of the journal is multidisciplinary, and authors are encouraged to emphasise the relevance of their own work to that of other disciplines. The journal is intended for fisheries scientists, biological oceanographers, gear technologists, economists, managers, administrators, policy makers and legislators.