An has influenced and misused the face of the land also reaches out into the water. During the Ist half-million years to be precise so fishing has grown continually, until at this time in fresh and shallow sea. Man has become the foremost important resource of mortality of fish.
However, he still leaves immense regions of the ocean, as of the land. it should be that methods of catching the fish that swim above deep waters will within the future produce changes there too, pro- a considerable extension of the food supplies of man and effecting great change within the population of the ocean.
Man has caught fish from his earliest times and he uses many parts their bodies. The skin is employed in making polishing material. The scales of the awful (Alburnus) yield a substance that when coated on to the within of glass beads makes artificial pearls. the liner of the air-bladder, of sturgeons, makes isinglass, a shiny powder used for various purposes as an adsorbent ( i.e, in wine-making).
Fish-glue is obtained from the animal tissue of the skin and other parts. Fish oils are used as food, and also are valuable within the manufacture of soap and other things. Besides they’re directly used as human food, fish products is also fed to animals, and also the liver makes excellent manure to agricultural plants.
BENEFITS OF FISHES TO MAN:
Fish therefore provide the staple for several human activities, but it is, of course, they’re caught majorly for food. From a fish diet one can obtain not only abundant calorific value of proteins, often the fat-soluble vitamins A and D, and typically considerable amounts of combined phosphorus and other elements.
Herring and mackerel are probably the most affordable source of protein available to several people in Britain. Fish are indisputably good food, and what’s maybe even more important they’re valued as such; most of the people think that they taste good.
It is inconceivable to provide an accurate estimate of the number of fish caught every year; 20 million tons, valuable £200 million, is under no circumstances an overestimate for the catch of the entire world in each of the years between the nice Wars that had happened. a big fraction of the nutriment of the civilization comes from fish.
The annual catch was estimated at 26 million metric tons in 1951. However there are important fishing industry within the American Lakes, the African Lakes and in many a part of the planet are raised on work, the water being manured to yield a decent crop of the freshwater and invertebrates on which the carp feed.
Fishing within the sea is restricted mainly by two considerations. Firstly, the labor is merely really profitable when the fish population is dense. Secondly, fish don’t keep well unless they’re treated in some special way and that they are therefore best caught close to their market.
METHODS OF CATCHING FISH
There also are various varieties of trap into which the swim and can’t escape. Danish seining, or purse seining, completely surrounding the fish and sometimes then also drawing the underside of the online together.
Firstly, lining may be a method that may be used for either pelagic fish. for example, the cod fishery of Newfoundland uses lines with several thousand baited hooks. Inshore fishing is also accomplished by beach seining, a process of enclosure of the fish from the shore.
Secondly, trawling may be a greatest method that’s wont to catch great quantities of fishes. These depends essentially on dragging a bag along the underside of the ocean, and also the differing types of adopt various means of keeping the bag open. the sooner way of doing this was by means of rigid bar and these beam trawls sometimes used poles over 50 ft long.
The otter boards is flat wooden structures attached at each end, so on sheer away once they are dragged through the water,when the fisher are opening the online. Especially the otter boards are now usually separated from the online by long wires and a tickler’ chain is attached before of the mouth. with such methods very great amount of fish will be taken from the ocean bottom.