Co-occurrence of the signal crayfish (Pacifastacus leniusculus (Dana)) and the spiny-cheek crayfish (Orconectes limosus (Raf.)) in a foothill-like river (northern Poland)
2006
Krzywosz, T.,Inland Fisheries Institute, Olsztyn (Poland). Dept. of Lake Fisheries
The current state of the crayfish in a foothill-like river, Naryjska Struga (Poland) was determined. The spiny-cheek crayfish, Orconectes limosus (Raf.), was noted to inhabit this river in the 1960s, while the signal crayfish, Pacifastacus leniusculus (Dana), escaped into the river from farms in the 1979-1981 period. Evo traps were used to make monitoring catches in 2002-05 years. The effectiveness of monitoring catches ranged from 1.58 to 6.18 specimens/trap/night. The male specimens of the signal crayfish had a total length range of 7.2 to 12.3 cm, at a weight range of 12.6 to 83.5 g. The length of the female specimens ranged from 7.1 to 12.2 cm at a weight range of 11.2 to 57.8 g. Specimens longer than 9.0 cm comprised 83.2 percent of the sample caught. The habitat conditions in Naryjska Struga River proved to be advantageous for the signal crayfish, and this species limited the previously-occurring spiny-cheek crayfish to a 1.2 percent share
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