In the master 's thesis we described the development of Italian crested newts larvae (Triturus carnifex Laurenti 1768) hatched in laboratory conditions. We compared their growth, survival, and behavior between treatments, which varied according to the amount of food available and the density of specimens. We also monitored the survival of embryos to hatching and confirmed developmental arrest syndrome in 49,7% of embryos. We divided postembryonic development lasting 97 days into 16 developmental stages. From stage 42 according to Harrison, which coincides with larval hatching after 14 days of embryonic development, to stage 57, when the metamorphosis is almost complete. We identified two forms of aggressive larval behavior; partial and complete cannibalism, although the latter was relatively uncommon. Partial cannibalism resulted in tail and limb injuries and, less commonly, gill injuries. Except in the case of the gills, the other injuries were not lethal as the damaged parts regenerated. Statistical analysis confirmed a higher frequency and more damage in smaller larvae and at a higher density of specimens in aquariums. The negative impact of high density of specimens on their growth and development has also been confirmed. Providing an adequate amount of food is also not negligible. The results of the study represent an important basis for comparative studies of ontogeny and show the importance of optimal conditions for the husbandry of the Urodela larvae under laboratory conditions.
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