What sizes, shapes and colors do not exist in nature among the inhabitants of the underwater world! To date there are over two thousand known species of fish, and how many more hidden in the unexplored depths of the oceans, seas, rivers and lakes.
Nothing compares the beauty of marine fish. The nature endowed them with so amazing colors that only wonder. And still people continue to surprise with new discoveries. So, for example, recently found one more new species of fishes, representatives of which glow in the dark like fireflies – amazing fish!
Unfortunately, to keep saltwater fish in aquariums is very difficult. Until recently, the presence of marine aquariums even zoos were considered “aerobatics” aquarium. Only in those countries where there was direct access to sea water, could be seen in aquariums of marine fish, and even then, the most common and less whimsical. As for what to say about the countries where sea can be seen only on TV! Continue reading
The main methods of intensification of pond fish farms are feeding fish and fertilizing ponds with increased stocking density of fish per unit water area. Natural forage base of the pond with increased stocking density of fish was not enough; she can no longer provide favorable conditions for feeding and growth of fish. In order for the fish planted in the pond on the increased norm, grew well and by the autumn had reached the standard weight, it is necessary to additionally feed her fodder mixtures and to simultaneously increase the stock and utilization of natural fish food by fertilizing the ponds, application of mixed landings of fish and other ways.
Range of feed for pond fish is quite large. They can be divided into feed of plant and animal foodstuffs. As plant feeds for fishes used most often wastes of different crops (barley, rye, wheat, corn) and legumes (lupine, soybeans, lentils, peas). Grain feeds rich in carbohydrates, legumes – proteins. Apart from them, are widely used for feeding fish different kinds of food, and even housing polikarpovich oilseed meals and cakes: sunflower, hemp, safflower, rapeseed, cotton, flax, etc. Continue reading
The fauna of the Black sea is varied and unusual. Their total number is sufficiently large. Many of the species listed in the Red book. There are some that are of great importance in fisheries. Some live here permanently, or come seasonally.
All the fish in the Black sea can be divided into two categories: cartilage and bone. Mainly it is home to bony fish, cartilaginous only four species. These include manta rays, stingrays, and cat sharks spiny. Can be found as freshwater species, and marine.
The body of the fish is elongated, laterally flattened and covered with thick scales. Can be big or little size. Thermophilic fish, leading an active lifestyle from may to September. Moves to warmer places. Has a great industrial value. Continue reading