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- W2313504638 abstract "Abstract Polar cod was the most abundant fish in 10 trawl hauls sampled July/August 1979. Fish in van Mijenfjorden and Krossfjorden differed in their length distribution from the other samples. C. adunca were present exclusively as ectoparasites with low rates of infection in Van Mijenfjorden and Krossfjorden, whereas on average 1/5 of the polar cod at other stations were infected. Fingerlings from 5.5 cm were attacked. C. adunca preferred the pectoral, first and second dorsal fins without individual choice, but in small hosts only the dorsal fins were attacked. Most fishes bore a single parasite, but op to eight Clavella were recorded on the same host. The parasites were clearly aggregated, probably with a negative binomial distribution. Rates of infection by the gill parasite H. cyclopterina were low, but it was represented on polar cod from the northernmost locality, Srneerenburgfjorden, About 90% of the hosts carried a single parasite. Two double infections, one also with a C. adunca, and three triple infections, one with additional S. lumpi, were found. H. cyclopterina prefers the second gill arch and its orientation inside the aorta, in relation to the polar cod, is random. The morphology of the parasite is illustrated, described, and compared with the best recent description based on a single individual. Animals with trunk lengths as small as 9.5 mm were sexually mature. Mean length of polar cod with H. cyclopterina was 18.8 cm, indicating that only the oldest fishes Were infested. Two small Sphyrion lumpi were recorded, for the first time on the polar cod." @default.
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- W2313504638 date "1980-11-21" @default.
- W2313504638 modified "2023-09-23" @default.
- W2313504638 title "The parasitic copepodsClavella adunca(StrøM),Haemobaphes cyclopterina(Fabricius), andSphyrion lumpi(Krøyer) on polar cod,Boreogadus saida(Lepechin) from Spitsbergen" @default.
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- W2313504638 doi "https://doi.org/10.1080/00364827.1980.10431490" @default.
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