As a rule, aquariums are made of silicate glass or organic (acrylic). However, many people don’t know what the difference is between the two – except that an acrylic aquarium is usually much more expensive. Because of this, it may seem that the acrylic aquarium is better, but this is not always the case. Both materials-acrylic and glass-have their advantages and disadvantages.
Glass is very difficult to scratch. This can be done only with a solid material and with the application of certain efforts, for example, a piece of unpolished aquarium gravel, stone or metal, deliberately leading them on the surface. Continue reading
What is viviparous?
Most fish lay eggs, but some species give birth to fry. There are two types of viviparous – viviparous and oviparous. The oviparous bear eggs inside, and the fry are born fully formed. They get their food from the deutoplasm. In the case of viviparous, nutrition is obtained directly from the mother. About 15 of the 480 known fish families exhibit some form of live birth. This includes half of all sharks and rays, as well as viviparous carpenters such as guppies, swordsmen, and mollinesians, as well as a number of unusual species.
How do viviparous mate? Continue reading
Previously, more than 200 species of this family belonged to the family rivulaceae. Except notobranchius, most aplocheilovyh have a narrow pike-like body length from 2 to 20 cm Dorsal fin shifted back, small. The anal fin is long and the ventral fins are small. The most brightly colored species of the order belong to the family. However, this color is an advantage only for males. Females are painted pale, expressionless.
Habitats are grassy alkanovich small shallow stagnant or slowly flowing waters of tropical forests and savannas. Epiplatys and fundulopanchax often live in areas of flooding, Nothobranchius — in temporary pools which dry up for several months each year. Continue reading