The choice of fishing method depends on the type of marine inhabitants, the depth and their way of life, as well as on measures of maintenance of ecological security.
What is a long-line?
It has received its name owing to a hook tackle with a bait, attached to a long cable - a long-line, which is immersed into water for catching. There can be from ten up to several thousand such tackles on one long-line. It depends on complexity and length of a design, as well as a way of its installation in water. A bait is represented by small fish or sometimes an artificial bait, which is put on manually or automatically.
Ways of installation of a long-line.
The stationary method assumes the installation of tackles by anchors at the sea bottom for several kilometers. To mark the order alarm markers are set in the beginning and the end of the installation, and they can be supplied with flashers and beam deflectors for convenient work during fog or at night. Thus, later a vessel can easily find the place of catching.
A drifting installation assumes a passive technics of catching: long-lines are thrown out into the sea where they float, catching fish with the help of a bait. For fixing the order on a certain depth small cargoes are used. The installation is also supplied with identification markers.
The methods of catching depend on the fish: for example, halibut likes stones, and the cod prefers deep and muddy water.
Methods of long-lines arrangement.
Long-lines can be settled down on the sea bottom, and in the water or on the water surface: it depends on types of marine inhabitants.
Ground installations are stretched on the ground or supplied with polyfoam in order to raise long-lines for fish living above the bottom. To adjust the distance up to the ground is possible with the help of cords with a cargo. This method is called pendant. Usually it is applied for halibut, cod, flounder, slopes, etc. If to replace hooks on tackles with traps, it is possible to catch crabs.
Surface installations are used for fish living in the water - for example, tuna. Usually, they represent drifting long-lines supplied with markers and flashers without anchors. Installation are kept in water for 5-6 hours – it is enough to collect much fish.
Sometimes this technics is used for night catching of squid: the installation is supplied with bright lamps and special hooks, moving constantly to attract squid.
Long-lines are lifted with special lifts automatically or manually.
The fish is removed from hooks and dumped into the container.
Special equipment cleans, washes out, processes and sorts fish according to the types and sizes. Fish is packed up and frozen, and can be sold at once. Alive fish is kept in the container with ice, in this case, the vessel should return to the port during several days.