Utilization Mechanism of Fisheries Information in Far-seas Skipjack Purse Seine

远洋鲣鱼围网渔业信息利用机制

• 批准号: 63560185
• 负责人: TAKEUCHI Shoichi
• 金额: $ 1.6万
• 依托单位: TOKYO UNIVERSITY OF FISHERIES
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1988
• 资助国家: 日本
• 起止时间: 1988 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63560185/
• 关键词: purse seine; fisheries information; fish detection; skipjack; catchability; データベース

In the far-seas skipjack purse seine fisheries, the numerous efforts are made on the locating of fishing ground, for the purpose of fish detection. The aim of this research project is the analysis on the utilization of fisheries information which is the decision factor for the fish detection in the fishing ground, and the evaluating of the fish amount, as well as the theory for attitude and behavior of purse seiner on moving to another fishing ground.The data on the fisheries information was collected by means of the on-board survey during the cruise of porse seiner. The information could be divided into two categories; macro and micro aspects. The macro aspects for fish detection mean the locating of fishing ground by use of radio communication with other vessels, the records of own past cruise and the position locating of the drifting timbers attached with the radio buoy. In the micro aspects, the observation from the bridge or crow's nest is effective to find out the flock of sea bi … More rds. In this case, after approaching to the position of sea birds flocking, the sonar scanning is conducted to evaluate the fish amount so as to decide the propriety of the fishing operation. On the effectiveness of radio communication and the navigation method for the fish detection, the data were also collected for the further analysis.The influence of the vessel size was also investigated, from the view point of catchability of purse seiner. After the enforcement of the new version for the tonnage measuring unit of vessel size, the far-seas skipjack purse seiner was regulated to be less than 351GT, and greater than or equal to 200GT, in the central area of Pacific Ocean. According to the new measuring unit, the re-modeled vessels are tended to be equipped with the larger fish-hold which may affect the operation theory in the purse seiner. With the catch data obtained at Yaizu port of Shizuoka Prefecture, the influence of re-modeling on the catch amount was analyzed in relation to the vessel's behavior. The re-modeled vessel with the larger fish-hold increased the number of operations, operating days and cruising days, while no change was observed on the catch amount per operation and per hauling as well. The effect of remodeling in vessel size was obtained as the increase of the yearly cruising number and yearly catch amount in the case of good catch condition.Concerning the fish detection by the binoculars observation on the bridge, the vibration near the wheelhouse may result into the lower ability for fish detection. According to the measurement of the vibration for the newly built purse seiner, the vibration of this vessel is considered not to affect the observation ability. Less

在远洋鲣鱼围网渔业中，为了进行鱼群探测，人们对渔场的定位进行了大量的工作。本研究的目的是分析渔场渔情信息的利用情况，并对渔场渔情信息进行评估，同时对围网渔船移向另一渔场时的姿态和行为进行理论分析。这些信息可以分为两类：宏观和微观方面。探鱼的宏观方面是指利用与其他船舶的无线电通信来确定渔场的位置、自己过去的航行记录和无线电浮标上漂流木材的位置。在微观方面，从桥上或瞭望台观察是发现海象群的有效方法 ...更多信息 rds.在这种情况下，在接近海鸟群集的位置后，进行声纳扫描以评估鱼量，从而决定捕鱼操作的适当性。在无线电通信和导航方法对鱼类探测的有效性方面，也收集了数据进行进一步的分析，并从围网的可捕性角度研究了船舶尺寸的影响。新版船舶尺度吨位计量单位实施后，在太平洋中部海域，远洋鲣鱼围网渔船被规定为小于351GT，大于或等于200GT。根据新的测量单位，改造后的渔船往往配备较大的鱼舱，这可能会影响围网渔船的工作原理。利用在静冈县烧津港获得的渔获量数据，分析了重新建模对渔获量的影响与船舶行为的关系。改造后的船具有更大的鱼舱，增加了作业次数、作业天数和巡航天数，但每次作业和每次拖运的渔获量没有变化。在渔获状况较好的情况下，随着年巡航次数和年渔获量的增加，对船舶尺寸的改造效果明显。在驾驶台上用望远镜观测鱼类时，驾驶室附近的振动可能导致鱼类探测能力降低。通过对新建围网渔船的振动测量，认为该船的振动不影响观测能力。少

项目成果

KOIKE, T.: "Catch analysis on reformation effect of purse seiners due to the tonnage measurement amendment." J. of TOKYO Univ. Fish., 77(1), 1990.

KOIKE, T.：“对吨位测量修正引起的围网渔船改造效果进行捕获分析。”

小池孝知: "まき網漁船の漁獲に及ぼす測定法改正による改装の影響" 東京水産大学研究報告. 77(1). (1990)

Takatomo Koike：“由于测量方法的修改而对围网渔船的渔获量进行改造的影响”，东京水产大学研究报告 77(1) (1990)。

小池孝知: "まき網漁船の漁獲に及ぼす測度法改正による改装の影響" 東京水産大学研究報告. 77(1). (1980)

Takatomo Koike：“测量法修订对围网渔船渔获量的影响”东京水产大学研究报告77（1）（1980）。