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
The hardness of water is the amount of minerals dissolved in it. If the amount of dissolved minerals is high-the water is hard, if low-then soft.
Water hardness increases when filtered through porous rocks such as chalk or limestone. Signs of high rigidity is the formation of lime plaque on pipes, taps and inside kettles, as well as the formation of foam on the water when adding soap. Hard water is found in areas such as lake Malawi, where fish are adapted to high hardness and pH levels.
Limescale and soap suds do not form in soft water. Soft water flows over hard rocks, such as granite, or through fallen leaves and peat, from which minerals are almost not washed away. Continue reading
Most viviparous fishes belong to the family Poeciliidae Cyprinodontiformes squad. They produce their offspring not in the form of eggs, but in the form of already formed fry, which have phenomenal adaptive properties. They immediately after birth descend to the bottom, hiding from predators and their parents in the bottom vegetation, and provide themselves with the first food there. With the growth of their ability to hide in the vegetation is only growing, and they often can be found near the surface. At the age of 6 months, they are already able to continue the birth.
In nature, all 140 species of viviparous fish can be found in the standing or slow-flowing water of freshwater bodies in South and Central America and Southeast Asia, as it is there that the environment can offer them warmth and abundance of vegetation. Continue reading