Caspian roach (Rutilus rutilus)
"Tolaks Ltd." Company offers roach.
The roach (Rutilus rutilus, family Cyprinidae, plural also roach) is a small freshwater and brackish water fish native to most of Europe and western Asia. It is typically a small fish, reaching 35 cm (14 inches) long, rarely 45 cm (17 inches), and weighing up to 1 kg (2¼ lb), rarely 1.8 kg (4 lb). It is very common and its flesh is often enjoyed as food.
Name's origin: from Old French roche, possibly from Germanic. It has an elongated tailfin with silver scales. Often found in moving water, the roach likes depths of about 2 or 3 m (6-9 ft); it also enjoys weedy waters. A gregarious fish that lives in schools; the bigger ones keep themselves somewhat apart from the others. Food: small mollusks, insect larvae, annelid worms, moss, algae, surface insects.
The roach has a non-keratinous outer skin of several layers about 100 μm thick. It is made up of connective cells. This epidermis has no glands, but there are glandular cells which secrete mucus that protects the fish's scales. The scales sheathe the roach in a kind of exoskeleton.
The roach has a head with eyes, and blind (i.e. without an opening at one end) nostrils, which do not open into the mouth as is true of other fishes. The roach also has a lateral line along each side, running from one end of its body to the other. This line of special scales is equipped with holes which connect the fish's outer body to the nervous system, enabling it to detect movements nearby by picking up small variations in long wavelengths in the water, caused by movements of other creatures.
The roach has a rather streamlined shape, being four times as long as it is wide. Two kinds of fins can be noted:
- unmatched fins, including the dorsal and caudal fins;
- matched fins, forming symmetrical pairs, including the pelvic fins at the rear and the pectoral fins farther forward.
The former give the fish stability in the water, and the latter are used for orientation.
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