reservoir

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Environmental problems of the White sea

White sea belongs to the basin of the Arctic ocean and represents a huge reservoir polutoratonny. Seas of this type are relatively few. Similar characteristics possess Black sea, the Mediterranean, the Baltic and Hudson Bay. White sea is the smallest of them. It is divided into two unequal parts – the Northern (outer) and southern (inner). They are joined by a relatively narrow Strait, also called the throat.

In modern times, few bodies of water that don’t pollute and the White sea is no exception. Anthropogenic pollution of the White sea began immediately after the occurrence on its shores of a man and eventually became so significant that the consequences can be observed today.

In a relatively short era of navigation, some areas of the bottom, especially in small lips, where it is convenient to stand during the storm, were so covered with coal slag, which still have not recovered destroyed the bottom biocenoses. These environmental problems of the White sea cannot be considered modern, though harm from them not less.

The woodworking industry has no less impact on the ecology of the White sea. Wastes at sawmill one keretsky industrialist, was filled in the Strait between the two Islands on which it is located.The forest industry is one of the key environmental problems of the White sea. Continue reading

The squad catfishes

Atkritumu fish. One dorsal fin. Pelvic fins located on the belly. In the pectoral fins and in most species the dorsal fin is spiny, often jagged rays. Non-rising mouth surrounded by tendrils. The jaws teeth. Body naked or covered with bony plates. Many have an adipose fin.

The inhabitants of the mainly tropical and subtropical freshwaters of South and Central America, Africa and Asia.

The squad consists of 20-30 families and over 1,200 species. 2 family of marine fish.

The Catfish Family – Siluridae

Body naked, elongated. Adipose fin not. The head is flattened, the mouth large, polverini. Dorsal fin short (not more than 5 rays). Anal fin long, not less than 70 rays. These freshwater and brackish-water predatory fish with spring and summer spawning. They live in fresh water in Europe and Asia, in addition to the basin of the Arctic ocean.

The family includes 8 genera, 2 of which are found in our country.

Rod Catfish – Silurus. Antennae 3 pairs. Thorn in the pectoral fin is smooth.

The genus includes 2 species.

Com S. glanis Linne, 1758. Front mandibular barbels shorter than the back. Spiny rays of the pectoral fin is strong (Fig. 110, 1). Reaches a length of 5 m. of residential Forms and the checkpoint form. These fish developed to take care of offspring. Soma build primitive nests from vegetation remnants.Inhabit the waterways of Europe: the Rhine, North to South Finland, and South to Asia Minor. Continue reading

Fishing for beginners.

As a nozzle for catching saltwater fish are great crabs, shrimp, mussels, sea fleas, sea worms, snails, animal spleen, and pieces of fish.

Typically large marine fish prefer to bite on the fry, fish fillet served, but also on crabs and shrimps (mackerel, sea cocks, Napoleon fish, flounder, etc.). Worms and maggots are suitable as a nozzle for catching smaller fish — sea bass, perch, goby, mullet, etc.

The lure of crab will attract primarily sea perch, wrasse, and goby. Crabs can be caught with hands in the coastal rocks. There is another effective method of catching crabs: tie to the edge of the twine or thick twine a piece of raw meat or fish and drop the bait between the rocks. Crabs will react to such a treat and clung to him. Crab meat can be stored in the freezer for a few days, before attachment to the hook it should be defrosted. Live crab can be stored for a short time in a bucket of cold water and seaweed in a cool dark place. On a hook baited with meat crab by removing the claws.

Shrimp is an indispensable nozzle for saltwater fish with a float and bottom fishing rods. Mined shrimp in the thickets of seaweed, as well as in freshwater reservoirs of the Far East. Obychno shrimp caught using nets, in which as bait, put the pieces of bread and meat. Nets set in the thickets of sea grass at a depth of 3-4 m Caught shrimp wrapped in wet cloth and stored in a cool place. To save the shrimp for a few days, they are boiled or salted. Shrimp skewer on the hook (for fishing) or using only the neck (for small). Continue reading

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