Net cage and net cage breed aquatics method

Abstract

To provide a crawl apparatus preventing a crawl from being drifted or broken and stably carrying out culturing even under severe conditions such as installation in a water area at a high water current speed or rough seas or stormy weather by, as necessary, arranging the crawl on or in the water and to provide a method for culturing in the crawl. The apparatus is equipped with the crawl 12, a buoyancy means 16, as necessary, changing and setting the position of the crawl in an optional sinking position on and in the water while supporting the the crawl 12 on or in the water with buoyancy and mooring means 14 for suppressing planar movement of the crawl 12 and mooring and supporting the crawl. For example, the apparatus is designed to locate the crawl 12 in water with relatively calm waves and float the crawl 12 on the water during operation such as feeding. Thereby, the crawl 12 can be used without being broken even in the open sea, etc., with violent waves and culturing in the crawl can stably be carried out. (C)2004,JPO.

Description

technical field [0001] The invention relates to a net cage device and a net cage culture method for aquatic product cultivation. Background technique [0002] In the past, aquatic products were cultivated by placing net cages (生けす) in land offshore or in inner bays with relatively slow flow velocity and smooth waves, and floating on the sea by installing floats on the net cage frame assembled with wood or bamboo, etc. The net tension that is suspended on the net cage frame is set in water and surrounds and cultivates aquatic products. [0003] Conventionally, when the net cages are arranged in inner bays where the flow velocity is slow, residues of bait fed to fish in the net cages settle to the bottom of the sea and become sludge to cause marine pollution. In addition, in closed waters like the inner bay where there is little water replacement, it is easy to infect fish with diseases. In particular, in recent years, elements such as nitrogen and phosphorus contained in dr...

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Problems solved by technology

Moreover, when a large number of fish are cultured in the limited space in the bay, the cages have to be densely arranged, and there is a risk of fish death due to insufficient dissolved oxygen in the water.

And when strong winds such as typhoons, because the net cage frame floating on the sea surface is directly subjected to the influence of strong wave undulation or fast current that strong wind etc. produce, thereby produce net cage drifting, damage, even because the net cage is broken and makes water The product runs away, causing large damage

On the other hand, when the net cages are arranged in the open sea in order not to pollute the ocean or have no impact on aquatic products, because the net cages are always directly affected by strong wave fluctuations or fast currents, the net cages are the same as typhoons. The risk of drifting and damage is high, and it is difficult to set up the cages in the open sea

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