| 翻訳と辞書 |
| Mammals and Birds Excluder Device ： ウィキペディア英語版 |
Mammals and Birds Excluder Device
A Mammals and Birds Excluder Device or MBED (also named Cachalotera) is a fishing gear device that avoids the depredation of the fish caught in the line for Marine Mammals, and avoids the entanglement of seabirds when is setting the line and hauling. This device was designed mainly for the interactions with toothed whales: Sperm Whales and Killer Whales.
== Mechanism ==
The Mammals and Birds Excluder Device (MBED) consists in a modification to the traditional Spanish bottom longline used in the fishery of Patagonian toothfish (''Dissostichus eleginoides''). Several configurations are in use depending on the country, and fishermen. The first descriptions were issued in Chile and Uruguay, starting the tests in 2006.
The main bottom longline is set in a simple way with a main line rigging from which many secondary or branch lines are hanging, of about 12 to 15 m long. On each of these lines, a cone-shaped device or protection net is placed in each secondary line, made by two metallic rings on the edge covered by a mesh net: the upper ring of 20 cm of diameter consisting in encased wire ending in retention rigging; and a lower ring of 100 cm diameter, with a separation distance between both rings of 180 cm. The mesh net composing the device is 7.5 cm, and on the upper ring, it ends in a knot allowing movement through the branch lines. Such branch lines are separated from 55 m to 70 m between them, and may be set in variable styles according to the hauling speed. One set contains 6 hooks, and such sets are prepared on the basis of 4 per box. This device as a whole has less density than the end weights (5 to 10 kg) and consequently, it rises up to the retention when hauling, and the hooks are uncovered when it reaches the bottom. When the longline is hauled back, the cone-shaped device is moved to the lower part of the branch lines, covering the hooks and consequently protecting the catch. The hooks are rigged in a piece divided into two bunches of 6 hooks each, being the main piece of 170 cm long and a diameter of 6 mm, and the two bunches are separated at 50 cm one from the other, the secondary lines (12 per piece) are 30 cm long and made of 4 mm diameter multifilament lines.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Mammals and Birds Excluder Device」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|