Nitrogen metabolism in the aquarium
Nitrogen metabolism in the aquarium: (1) Forage (2) NH 3 . (3) NO 2 . (4) NO 3 . (5) H 2 O. (6) Lighting, (7) Fertilizer (8) O 2…

Continue reading →

Choose aquarium fish
As a rule, the aquarium contains several species. Therefore, in the first place, choosing fish for the aquarium aquariums it is necessary to consider the conditions of feeding and the…

Continue reading →

North American catfish thronging fishes of the Kuban
North American catfish, introduced 30 years ago in Krasnodar region, thronging fish-natives, including our native European catfish. American channel catfish was brought in a fish farm of the Krasnodar territory…

Continue reading →

special

Sharks

Sharks are one of the most formidable inhabitants of the ocean. The lack of bone tissue and Gill covers, especially the structure of scales, and many other features of the structure speak of their ancient origin, as confirmed by paleontological data the age of the first fossil remains of sharks is determined approximately 350 million years. Despite the primitiveness of the organization, shark — one of the most perfect predatory fish of the ocean.

Over a long period of existence they managed to adapt perfectly to life in the water column and now successfully compete with bony fish and marine mammals. Unlike bony fish sharks and rays don’t spawn and lay their large, covered with a Horny shell eggs or give birth to live young.

The highest values reach whale (up to 20 meters) and the so-called giant shark (up to 15 meters). Both these and others, like baleen whales, they feed on planktonic organisms. Wide and gaping jaws, these sharks move slowly in the midst of clusters of plankton and filter the water through Gill openings covered by a network of special outgrowths of surrounding tissue. Giant shark profiltruyte an hour to one and a half thousand cubic meters of water and remove all organisms larger than 1-2 millimeters. Continue reading

Top 10 most dangerous animals of Ukraine and Crimea
Weeverfish. Considered the most dangerous fish in the Black sea. Injections beware of its poisonous spines on the Gill covers and dorsal fin. The poison is not fatal, but the…

...

Sea hare: fish from the Pacific ocean
Description fish-rabbit Sea hares are most common in the Western Pacific, the Mediterranean and the tropical waters of the Indian ocean. They have a medium size and oval body, flattened…

...