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Diseases of Aquatic Organisms

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DAO 21:209-214 (1995)  -  doi:10.3354/dao021209

Description of Trichodina hippoglossi n. sp. from farmed Atlantic halibut larvae Hippoglossus hippoglossus

Nilsen F

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.

Atlantic halibut . Trichodina hippoglossi . New species . Description . Morphology

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