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
Aquarium fish, by definition, live and breed in the aquarium. For the most part, people have fish for decoration, but in some cases they are specially bred for sale. Ornamental fish in natural conditions live in subtropical and tropical fresh waters, and obliges the owner of the aquarium to maintain appropriate habitat conditions with a high temperature water environment.
Many aquarium fish have odd shapes, small sizes and bright colors, for which they are highly appreciated in the decorative plan. The most popular are goldfish, which as if came to us from the famous fairy tale. In the Russian realities aquarium fish is ecosublime, Cypriniformes and Perciformes orders. Well, most often in aquariums of our residents can meet angelfish, barbs, catfish and nannostomusy.
If you are new to the aquarium thing, we might think that fish is an extremely stupid water creatures. In fact, they are bought only for beauty and decoration, so the mind is required. Moreover, some people consider fish not as living beings but as a real decorative object. Only with time come to them the idea that in the aquarium swim real Pets, for which poznavatelnoe very interesting to watch. Aquarium fish are often attracted to genetic research, resulting in new and very beautiful variety.
To do fish, you can not only adults but also children. For the latter category is especially useful, since communication with aquatic animals, develops psychological comfort and establishes emotional contact. Simultaneously, children develop skills and a sense of responsibility. Fish can even be affected person on a physiological level. In the process of monitoring the normalization of blood pressure, disappears stress, calms heart. Continue reading
Reproduction and spawning
Reproductive behavior of tropical marine fishes is poorly documented because only a few species breed in captivity. However, some – such as clowns, gobies and seahorses to breed relatively simple. Others, like coral fish may spawn in the aquarium but the fry are so immature that they are very difficult to grow.
To ensure availability in the aquarium at least one opposite-sex pairs marine fish breeding is almost impossible, because in most species males and females are externally indistinguishable just. However, if you keep the fish in the pack, their behavior will help you to determine the sex charges. If two identical fish fight is most likely male contesting territorial rights. If two fish are related to each other friendly, it can be compatible in a female and male. Unusual swimming movements or postures may not be indicative of flirting – so, in your aquarium just got a couple. In the mating season sometimes appear insignificant physical differences: the female has, of course, the belly is inflated from the calves. Males often intensifies the color, and the picture loses clarity. Some species are able to change their gender, what does not prevent, but rather contributes to the search for a pair for spawning. For example, all multiclone – males, but if you have a small group (two individuals), the dominant fish will become the female and will mate with the nearest dominant male. Kood I-frames and some coral sex change occurs in the opposite direction: the dominant individual in a purely female group turns into a male. Continue reading