Studies on the Invluence of fishery wastes of Fish Behavior and the Develpment of Technology to remove the Wastes from the Seabed

渔业废弃物对鱼类行为的影响研究及海底废弃物清除技术的发展

• 批准号: 13680653
• 负责人: YOSHIHARA Kiyoshi
• 金额: $ 1.98万
• 依托单位: Nihon University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13680653/
• 关键词: Fisheries Wastes; Development of Technology to move; Takada bank of Sagami nada; Verical long line fishery; Deep sea Underwater Camera; Annulus liked matter; Bacteria flora; 回収機材の開発; 高場; 立延縄漁具; 深海水中ビデオ; 付着細菌; 回収器材; 立延縄; 付着生物; 成長履歴

In 2002, we investigated on the efficiency of tools for recovering wasted fishing gears, such as fishing lines, hooks and sinkers that were used for deep-sea fishing, from the floor of the sea. We reported that the most efficient tool was the one which uses a stainless steel rod, 12 mm in diameter, to which hook-shaped metal rods are welded (Type IV).In 2003, the Type IV was improved by lengthening the stainless steel rod to 2 m. We also shortened the length of the Type IV to 1 m for better maneuverability. The two modified models were tried separately on an actual fishing ground. Though the conditions of the tried area for the two models were different in terms of the current, wind, etc., we observed that the 2 m model was more efficient in catching the wastes than the 1 m model. Many of the collected wastes had various organisms with hard calcareous shells attached on them. The deep sea video camera set at the fishing ground showed that the wastes have become part of the ecosystem on … More the seabed.The wastes were collected around the summit of a high ground of the seabed. The amount of wasted collected was larger in the area toward northeast from the summit than the area toward southwest. In the area toward northeast, the amount of wastes collected was higher near the summit than that of away from the summit. In the area toward southwest no such difference was observed in the amount of wastes collected. As a whole, the amount of wastes collected was larger near the summit of the high ground than that away from the summit.In order to find out the effect of wastes on fishes, we kept fishes in a tank which contained the various wastes that we collected from the seabed, but the behavior of the fishes did not appear to be affected by the presence of such wastes in the tank.We used the section of the seashells that have been attached to the wastes to determine how long ago the wastes have been discarded. We were able to observe clear growth patterns n the section of the shells.We also found and identified 54 families of bacteria on the wastes we collected from the seabed. Less

2002年，我们调查了从海底回收废弃渔具的效率，如用于深海捕鱼的鱼线、鱼钩和下沉器。我们报告说，最有效的工具是使用直径为12毫米的不锈钢棒，其钩形金属棒焊接（IV型）。2003年，IV型通过将不锈钢杆延长到2米进行了改进。我们还将IV型的长度缩短到1米，以获得更好的机动性。两种改进后的模型分别在实际渔场进行了试验。虽然两种模型的试验区域的条件在电流、风力等方面有所不同，但我们观察到2m模型比1m模型更有效地捕获废物。许多收集到的废物上附着着各种坚硬的钙质外壳。设置在渔场的深海摄像机显示，这些废物已经成为海底生态系统的一部分。废物是在海底高地的山顶周围收集的。峰顶向东北方向的垃圾收集量大于峰顶向西南方向的垃圾收集量。在东北方向，峰顶附近的垃圾收集量高于远离峰顶的垃圾收集量。在西南方向的地区，收集到的废物数量没有这种差异。从总体上看，高地峰顶附近的垃圾收集量大于远离峰顶的垃圾收集量。为了找出废物对鱼类的影响，我们把鱼放在一个装有我们从海底收集的各种废物的水箱里，但鱼类的行为似乎并没有受到这些废物的影响。我们用附着在废物上的贝壳来确定废物被丢弃多久了。我们能够在贝壳的截面上观察到清晰的生长模式。我们还在从海底收集的废物中发现并鉴定了54种细菌。少