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

在2002年，我们调查了从海底回收废弃渔具（例如用于深海捕鱼的鱼线、鱼钩和沉子）的工具的效率。我们报告了最有效的工具是使用直径为12 mm的不锈钢棒，在其上焊接钩形金属棒（IV型）。2003年，IV型通过将不锈钢棒延长至2 m进行了改进。我们还将IV型的长度缩短至1米，以获得更好的机动性。这两种改进的模型分别在实际渔场上进行了试验。虽然两种模型试验区域的条件在水流、风力等方面有所不同，我们观察到2米的模型比1米的模型更有效地捕捉废物。许多收集到的废物都有各种生物，上面附着着坚硬的石灰质外壳。设置在渔场的深海摄像机显示，这些废物已经成为生态系统的一部分， ...更多信息 海底。废物收集在海底高地的顶部周围。从山顶向东北方向收集的废弃物量大于西南方向。在东北方向，垃圾收集量在山顶附近高于远离山顶的地区。在西南部地区，在收集的废物数量上没有观察到这种差异。整体而言，在高地顶端附近收集的废物量较远离顶端的多，为了了解废物对鱼类的影响，我们将鱼类饲养在一个鱼缸内，鱼缸内装有我们从海底收集的各种废物，但鱼的行为似乎并没有受到水箱中这些废物的影响。我们使用的是具有被附在废物上，以确定废物被丢弃了多久。我们在贝壳的断面上观察到清晰的生长模式，并在从海底收集的废物上发现和鉴定了54个细菌科。少

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