When we read the price tag on “butterfish”, we don’t always know what we buy, then what under the trade name “butterfish” are hidden very different between fish from the three different families and four genera: two species from the family stromateid – stromateus (Stromateus brasiliensis) and the American butterfish (Peprilus triacanthus) . Australian seriolella (Seriolella brama) from the family centrality, as well as Escolar or gray delicacy mackerel (Lepidocybium flavobrunneum) from the family gimpelevich. Sometimes oil fish sold as toothfish is a much more valuable under the threat of destruction of fish, at least – on the contrary, often these names are given together. Usually trade name brings together related species. Here we have an unusual case – a trade name is formed primarily on the basis of similarity in the taste, although oily fish and have some similarities in appearance and lifestyle. Moreover, this name is not our invention. Perhaps it comes from the U.S. oil fish, which in English is called “butterfish”. Continue reading
Among the modern sharks should first be noted epipelagic planktophagous of being the largest members of the superorder, class, and all living groups participatng animals. These giants feed on similar to baleen whales, filtering thousands of cubic meters of water through a “net launcher”. which has become Horny Gill stamens of these sharks. Remaining in the oral cavity Maso and Munro – plankton (except for especially large objects) and serves as food sharks planktophagous. Just today there are three such shark: giant whale, which the inhabitants of epipelagial, and largemouth tending to mesopelagial, for depths greater than 150 m.
These sharks differ from individuals of other species by a number of morphological features associated with the specifics of the production of food. First of all here should stay on the morphology of the Gill apparatus sharks planktophagous, Except a kind of Gill rakers, they have a very large mouth, largemouth and whale sharks is almost final. Epipelagic sharks-planktology filter huge amounts of water and thus receive the necessary amount of food in places of mass accumulations of planktonic organisms,so the whale and especially of basking sharks clearly feed migration. Continue reading
The pond – a beautiful decoration of a country house or infield. Properly planned and secured all the necessary pond will create a comfortable microclimate, will attract the attention of guests, and the owners will give an opportunity to relax and regain good mood.
To provide microclimate and cleanliness of the pond help pond equipment such as pumps, aerators, filtration system, and accessories – scissors, tongs, skimmers, nets, cleaners the bottom. Experts will help to choose the equipment that best suits Your goals. One thing a large pond where you can fish and swim, and quite another – a small decorative pond. From its size and functions depends on the capacity of the purification system. Mechanical filters clean the water in several ways. Water is disinfected with ultraviolet light, algae and debris remain on the brushes, the porous material separates the microorganisms and the minerals release water from harmful substances. In addition to mechanical filtration in ponds used bioform. For example, in the area of shallow water you can create the swamp with the special plants that will filter the water. Reed will miss the air under the ice in winter. Gravel and small stones will saturate the water with necessary minerals. While a variety of fountains and waterfalls adorn the pond, and provide oxygen to its inhabitants. Continue reading