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
The main reasons for the popularity of clown fish among aquarists. The absence of teeth on the tongue and large oval black spots on the back – one of the hallmarks of pink salmon. The lionfish is one of the brightest representatives of the fauna of coral reefs.
Cat – representatives of a family of mammals Carnivora. A description of the most prominent representatives of the cat family. The habitat of the tiger. The leopard is a typical representative of the vast large of the cat family. The Puma is a large American cat.
A variety of types, shapes, colors, and sizes of marine jellyfish. Features of Medusa Nochesvetka, inhabiting the Mediterranean sea and its living in the warm seas. The danger of the poison of jellyfish (the most venomous sea wasps). The use of jellyfish in medicine.
Morphological description of the family of predaceous diving beetles as representatives of aquatic beetles. The geography of the habitat of representatives of this family. Features the power of life and daily activity of predaceous diving beetles. The analysis of the evolution of rakoobraznyh fauna.
Study the amazing and diverse life in the ocean depths. A variety of shells, rare species of fish, corals and plants living in the ocean. Description of the many exotic inhabitants of the underwater world. Underwater expedition scuba divers.
Characteristics of isotopomer of the Republic of Adygea. Species composition of fish in rivers and lakes. A variety of classes in the fauna of amphibians. The class description, type, category of security, significance, habitats, biology and abundance of carp, newts and trout. Continue reading
Sea stars (Asteroidea) – the denizens of the deep, the class of invertebrates such as echinoderms. Starfish being relatives of sea cucumbers, brittle stars, sea lilies, sea cucumbers, sea urchins, – currently there are about 1600 species, having star-shaped or pentagonal shape. The starfish, despite its inactivity and the absence of the head itself, well developed nervous and digestive systems. Why, in fact, “echinoderms”. It’s all in the hard skin of sea stars – from the outside it is covered with short needles or spikes. Conventionally, these whimsical creatures can be divided into three groups: common sea stars, feather stars, known for wriggling rays (up to 50!), and “fragile” stars, casting its beams in case of danger. However, for this animal is not difficult to grow themselves new, and from each beam soon there will be new stars. How is that possible? – Due to the characteristics of the structure of stars – each of its rays made in the same way, and contains: two digestive outgrowth of the stomach, performing the function of the liver red eye spot at the tip of the beam, protected by a ring of needles radial bundles of nerves olfactory organs (they are the same suction cups and method of transportation) located in the groove on the ventral side papules is skin gills in the form of fine short fibers, located on the back and producing the gas exchange processes of genital organs (usually two of gondina each beam) skeleton consisting of a longitudinal series of vertebrae within, and hundreds of calcareous plates with spines, covering the skin and connected with muscle that not only protects the animal from damage, but also makes it very flexible rays. The bodies of starfish are made of 80% calcium carbonate. Thus, each ray of the starfish, being separated from her body, it is a viable and rapidly regenerates. Continue reading