皇冠体育app

皇冠体育app Crucian carp (Carassius carassius) is a medium sized cyprinid fish which mainly inhabits small still waters. 皇冠体育appre is now a strong, but as yet unsubstantiated belief that this native species is under increasing threat from hybridisation, competition and disease from other closely related nonnative fishes such as common carp (Cyprinus carpio) and goldfish (Carassius auratus). 皇冠体育appse threats are considered to be Europe-wide and are compounded by difficulties in identification of pure-bred C. carassius and hybrids by external morphological investigation and by some unresolved taxonomic problems. Of particular note is the species in Europe commonly known as the 鈥済ibel鈥� or 鈥減russian鈥� carp. It has long been discussed but is still not known whether this is a species in its own right, a subspecies of the goldfish or whether it may be of hybrid origin.