SEMI-NATURAL REPRODUCTION Semi-natural reproduction can be carried out (Aquarium fish)
SEMI-NATURAL REPRODUCTION Semi-natural reproduction can be carried out with those fish which normally live in groups and do not form stable pairs, such as the Characins. A group of ten can be inserted into a rearing tank adjusted to their requirements and left to reproduce. There are then two possible scenarios: - the adult fish are removed and the aquarist looks after the fry; - the adults and the fry are left together, so hiding places must be provided for the young - plants on the water surface, rocks, etc. The fry are not moved until they measure 5-10 mm, when they are transferred to another tank to grow into adults. The remaining adults can reproduce again as soon as the maturing phase has passed. The advantage of this method is its relative ease: one or several pairs are allowed to form and they can reproduce whenever they want. Leaving them with the eggs and fry allows a type of natural selection to come into play, whereby only the strongest and most agile will be able to escape the predatory instincts of their parents.Fish with adhesive eggs Fish such as the Characins that do not look after their offspring lay them on fine-leaved plants (like Myriophyllum and Cabomba), which you should make available in the aquarium. Alternatively, it is possible to use a web made of Perlon wool, which is commercially available for use in filters. This provides a very good artificial support. The parents must be removed after the eggs are laid. Some species not only look after their eggs, but also sometimes their fry. Some, such as the scalares, lay their eggs on a plant with hard leaves, while others, such as certain American Cichlids, do so on a vertical or horizontal rock face. An artificial laying support can also be provided, by using a PVC tube or plate, for example. Other Cichlids - Africans from Lake Tanganyika or Americans, such as species of the Apistogramma genus - lay their eggs in a cavity or small cave, sometimes even on the ceiling, if this is the only suitable place. In all cases where the eggs are laid on a rigid support, this is generally cleaned by one of the parents before the female deposits the eggs that the male will go on to fertilize. The male will then defend the site against any possible enemies, while the female ventilates the eggs with her fins. There are some occasions when the parents swap roles, and others when one of the two even separates out dead eggs, distinguishable by their opaque white color. The fry are then supervised by their parents until they are independent.
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