Tropical Fish - Freshwater Fish Labeos
FRESHWATER FISH Labeos One look at the labeos’ shape reveals that they are bottom-dwellers in fast- flowing water: quite streamlined to minimize current drag, with a flat belly for resting on the bed and barbels for sensing prey on or in the substrate. These fish are primarily “twilight” (nocturnal) species; they are also aggressive toward conspecifics in defense of their territory, though coexisting peacefully with other species. As is the case with other aquarium fish, it has become possible to breed the labeo borrowing techniques recently developed by scientists for propagating marine species. This involves the use of hormones, and is a method unavailable to the amateur breeder. What happens is that the hypophysis - a small gland located at the base of the brain - is removed from carps or related species and crushed in a slightly saline solution. A minute quantity of this solution - containing the diluted hormone - is injected into the chosen fish; if she is “ripe,” she will start to lay within 24 hours, producing hundreds of eggs. Labeo frenatus Albino variety. Size: 10-15 cm. Labeo frenatus The red-finned shark or rainbow shark is distinguished from Labeo bicolor by a less intense body coloration and by its red fins. Sometimes a commercial albino variety is found, which can be mated with the normal variety; the fry will then display the coloration of one or other of the parents. Size: 10-15 cm. Labeo bicolor The red-tailed black shark, rather nocturnal in its habits, obtains its food by sifting the bed of its natural habitat. In captivity, it needs extra vegetable material. By day it lurks in various hiding places (rocks, roots, etc.) which form an essential part of the aquarium furnishings. Size: 10-15 cm. Goldfish varieties (Carp family) The goldfish: theme and variations The goldfish is the oldest “domesticated” fish; its story began long before hobbyists started keeping it in aquariums. The feral form, less brightly colored than the present fancy varieties, can reach 40-50 cm. Originating from Asia, it has now spread throughout all the temperate waters (5-25 C) of the globe. The classic red variety was selectively bred from feral stock, probably before the time of Christ, though breeding has made enormous advances since the Middle Ages. The earliest importations to Europe date from the 17th century, in the form of gifts made to the French royal family. There are many varieties, all of which have been isolated, after a long and painstaking series of selections, using the familiar red strain as a starting-point.
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Tags: aquarium fish, freshwater fish