New Zealand Journal of Marine and Freshwater Research abstracts

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M99065
Received 5 November 1999; accepted 5 April 2000

Chemotherapy of the ciliate Trichodina sp. on juvenile turbot (Colistium nudipinnis) with notes on the susceptibility of fish with abnormal pigmentation

B. K. DIGGLES

National Institute of Water & Atmospheric
 Research Ltd
P. O. Box 14 901, Kilbirnie
Wellington, New Zealand
email: b.diggles@niwa.cri.nz

Abstract  Turbot (Colistium nudipinnis (Waite, 1910)) fingerlings reared from a single batch of eggs during the 1998 breeding season were examined by histopathology during a routine health assessment. Fish exhibiting pigment abnormalities such as brown coloration, extensive ambicoloration, or hypomelanisation of the ocular surface were significantly smaller, and had a significantly higher prevalence of kidney lesions and the ciliate Trichodina sp. on the gills than did normally pigmented fish. This suggests that abnormally pigmented fish grew more slowly and were more susceptible to disease. Additional fish were exposed to 12 different chemotherapeutic bath treatments to determine the most effective methods of removing Trichodina sp. Treatments which removed 100% of Trichodina sp. while providing 100% survival of fish included 200 ppm formalin for 30 min, 200 ppm formalin for 1 h, fresh water for 30 min, and 25 ppm formalin + 0.08 mg/litre malachite green for 24 h. The recommended treatment against Trichodina sp. for use in a commercial situation is 200 ppm formalin for 30 min. The significance of these findings to culture of turbot in New Zealand are discussed.

Keywords  Pleuronectidae; mariculture; disease; chemotherapy; Ciliophora

New Zealand Journal of Marine and Freshwater Research, 2000, Vol. 34: 653-660

0028-8330/00/3404-0653 $7.00 (c) The Royal Society of New Zealand 2000

PDF file of entire paper: medium quality (611K); (scanned from paper original: notes about this process)

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