Research on the process of by-catch of discards in coastal fisheries ; development of environmentally-friendly fishing technology

沿海渔业丢弃物兼捕过程研究；

• 批准号: 06660247
• 负责人: MATSUOKA Tatsuro
• 金额: $ 0.51万
• 依托单位: Kagoshima University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06660247/
• 关键词: prawn (shrimp); bottom seine net; fishing gear; by-catch; discard; behavior; optomotor response; coastal environment; 選択性; 投棄; 底曵き網; 行動; 電気生理; 側線

1. Survey of by-catch discards in coastal fisheries : Discards in gochi-ami (non-dragged small boat seine) fishery was surveyed onboard and multi-variable-analyzed. Species compositions were largely different among sub-sectors, or discards occur specifically. Discard ratios also differed among sub-sectors. A large amount of stock-enhanced highly-commercial species were discardedThis was developed in methodological study on large-scale discard estimation. The best factor for discard estimation is a summed discard ratio and a specific discard ratio has no statistical basis because of poor correlation between discards and retentions.2. Behavior of organisms against fishing gear : Behavior of deep-water prawn against boat seine was observed by infra-red underwater video and unique behavior of prawn to bounce net webbing backwards and pass through a mesh by probability was found. The exclusion process for prawn was modelled and probabilities for prawns for exclusion were simulated.3. On-boa … More rd study on by-catch capture process : Selectivity of boat seine for prawns and by-catch finfishes were studied on the basis of samples captured by an experimental net with pocket and cover nets over the net panels and codend. Prawns are excluded over the gear, while, finfishes, mainly through the codend. Selective characters were quite different between the codend and the net as a whole. Size-selectivty of the gear with different meshes were theoretically calculated and 'mesh-selective size management diagram' was established for recommendation for fishing gear management.4. Present studies and future prospects : The precise process of exclusion for prawn though a mesh is being analyzed. Together with the field observation of behavior and the above analysis, the process to induce the selectivity is to be modelled. A new series of field experiments to develop selective boat seine is being prepared in order to verify the theoretically evaluated models and to develop practically selective fishing gear. Less

1.近海渔业副渔获物废弃物调查：对无拖式小船围网渔业的废弃物进行了船上调查和多变量分析。各分部门之间的物种组成差异很大，或者丢弃物具体发生。各分部门的丢弃率也各不相同。13大量的高经济价值的人工林被淘汰，这是在大规模废弃物估算方法学研究中发展起来的。丢弃率的最佳估计因子是丢弃率之和，由于丢弃率和保留率之间的相关性较差，因此具体的丢弃率没有统计学基础.生物对渔具的排斥行为：通过红外水下摄像观察了深水对虾对船围网的排斥行为，发现了对虾独特的反跳网带和概率穿网的行为，建立了对虾的排斥过程模型，模拟了对虾的排斥概率.翁博阿 ...更多信息 第三部分副渔获物捕获过程的研究：以网片和网囊上的兜网和罩网为试验网，研究了船围网对对虾和副渔获鱼类的选择性。虾被排除在渔具之外，而鳍鱼则主要通过囊体。网衣和网衣的选择性状总体上存在较大差异。理论计算了不同网目尺寸的选择性，并建立了“网目选择性尺寸管理图”，为渔具管理提供参考.研究现状与展望：分析对虾通过网筛的精确排除过程。结合行为的现场观察和上述分析，将模拟诱导选择性的过程。目前正在准备进行一系列新的实地试验，以开发选择性船围网，以便验证理论上评价的模型，并开发实际上选择性的渔具。少

项目成果

Tatsuro Matsuoka et al.: "Assessment by underwater infrared video of the selectivity of an experimental Danish seine for deep-water prawn" Second World Fisheries Congress. (in press). (1997)

Tatsuro Matsuoka 等人：“通过水下红外视频评估丹麦实验围网对深水虾的选择性”第二届世界渔业大会。

Tatsuro Matsuoka et al.: "Assessment by underwater infrared video of the selectivity of an experimental Dabish seine for deep-water prawn" Second World Fisheries Congress (in press), (1996)

Tatsuro Matsuoka 等人：“通过水下红外视频评估实验性 Dabish 围网对深水虾的选择性”第二届世界渔业大会（正在出版），（1996 年）

Tatsuro Matsuoka et al.: "Assessment by underwater infrared video of the selectivity of an experimental Danish seine for deep-water prawn" Second World Fisheries Congress(in press), (1996)

Tatsuro Matsuoka 等人：“通过水下红外视频评估实验性丹麦围网对深水虾的选择性”第二届世界渔业大会（正在出版），（1996 年）

松田 皎 (編): "漁業の混獲問題" 恒星社厚生閣, 114 (1995)

Akira Matsuda（主编）：“渔业兼捕问题”Seiseisha Koukaku，114（1995）