Parasites of cultured cod (Gadus
morhua) postlarvae fed natural zooplankton
E.
Karlsbakk, E. Otterlei, H. Hoie, A. Nylund-2001
Bulletin of the European Association of Fish
Pathologists, 21 (2) : 63-70 (from
Current Contents)
Abstract :
Parasitological examination of cod postlarvae
(14.5-35.5 mm) fed natural zooplankton (max 1 mm filter) revealed 6 helminth
and 3 copepod parasites. Micro-ectoparasites were not detected. The
helminths were a pseudophyllidean cestode larva (caeca), 4 immature
trematodes (Hemiurus communis, H. Iuehei, Derogenes varicus, Lecithaster
sp.) and larvae of the nematode Hysterothylacium aduncum freely moving in
the visceral cavity. The most common parasites found were copepods, various
stages of Caligus elongatus (skin and fins) and larvae of Holobomolochus
confusus in the nostrils. An immature Clavella adunca (Copepoda) was found
once. All the parasites found are introduced as parasites in planktonic
copepods (helminths) or as planktonic larvae (copepods). Available knowledge
on the impact of these parasites on fish larvae is reviewed.
(Univ Bergen, Dept Fisheries & Marine Biol, POB 7800, N-5020 Bergen, Norway)