Problems of the Northern Pike Esox lucius Cultivation in the Laboratory Conditions
DOI:
https://doi.org/10.29038/2617-4723-2020-1-389-40-44Keywords:
Esox lucius, Saprolegnia, eggs, larvae, ontogeny, environmental factorsAbstract
In the article, main concerns arising both at the time of incubation and while cultivating fish in laboratory conditions were identified. The main morphological features of fishes at different stages of ontogenesis used to determine the developmental stage of the northern pike Esox lucius were described. The cultivation of fishes in the laboratory conditions is necessary for ecological researches, for the study of morphogenesis of organ systems, and other studies where fishes should be continuously monitored at different development stages. In the laboratory, during the incubation of the eggs, problems can mainly emerge from the impossibility to ensure the constantly running water for the incubation boxes with eggs. During the cultivation of northern pike Esox lucius, because of the high density of eggs, the timely and prompt fight against the water fungs of the genus Saprolegnia is very important. It is necessary to take away the eggs affected by fungs. It is important to regularly replace the water in the incubation boxes with pikes. The new water should not differ a lot in its chemical composition. The particularity of the northern pike Esox lucius is the spawning at low temperatures, that is why it is very important to keep in check the water temperature where eggs and larvae are being developed. The pace of development of the northern pike Esox lucius in laboratory conditions is accelerated if compared to the natural ones. Incorrect conditions of eggs fertilization and incubation as well as feeding larvae with food inappropriate in size can cause the mass mortality of fishes at some critical stages of their development or the developmental impairment. During the research, such morphological impairments of embryos of the northern pike Esox lucius is the anlage of two heads and, on the contrary, the head not being fully developed up to the moment of hatching were detected.
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