ABSTRACT: A new species of Trichodina, T. hippoglossi n. sp., collected from skin and fins of farmed Atlantic halibut Hippoglossus hippoglossus (L.), is described. Heavy infections were first evident after a temperature rise from 12 to 18*C. The most infected specimens were easy to detect due to increased mucus production, which gave the larvae a greyish skin colour. T. hippoglossi is relatively large, 78.5 +/- 6.9 um (mean +/- SD; range 65.9 to 89.6 um), with a denticle ring comprising 28 (mode; range 26 to 30) denticles and with a denticle span of 17.6 +/- 1.1 um (mean +/- SD; range 15.7 to 19.2 um). In silver-impregnated fully grown specimens, a prominent clear central disc is present.

KEY WORDS: Atlantic halibut . Trichodina hippoglossi . New species . Description . Morphology

Published in DAO Vol. 21, No. 3 (1995) on March 30
ISSN: 0177-5103. Copyright © Inter-Research, Oldendorf/Luhe, 1995