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Wrasse: Biology and Use in Aquaculture

M. D. J. Sayer (Editor), J. W. Treasurer (Editor), M. J. Costello (Editor)
ISBN: 978-0-85238-236-3
296 pages
April 1996, Wiley-Blackwell
Wrasse: Biology and Use in Aquaculture (0852382367) cover image
Sea lice remain one of the main problems in salmon farming, with estimated costs of treatment and losses of fish running to several million pounds each year in Scotland alone. The use of chemical methods by the industry has brought adverse publicity and wrasse (cleaner fish) present an alternative, environmentally friendly means of biological control. As a result, the demand for wrasse has spawned a new inshore fishery, and this has led to calls for more information on the population dynamics and size of stocks. Attempts are also being made to rear wrasse for stocking. As a consequence there is considerable interest in cleaner fish technology from fish farmers and research workers. This book draws together the latest information on the biology and culture of wrasse, and the use of wrasse in controlling sea lice.
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Preface.

Part I: Wrasse Biology. North-European wrasse -.

seasonal, sexual and geographical variation in the biology of goldsinny, corkwing and rock cook on the west coast of Scotland -.

Observation of wrasse on an artificial reef -.

Field observations fo the cleaning of ballan wrasse and torment feeding -.

The territorial range of goldsinny wrasse on a small natural reef -.

Distribution and abundance of wrasse in an area of northern Norway -.

Capture techniques for wrasse in inshore waters of west Scotland -.

The biology of inshore goldsinny populations: can they sustain commercial exploitation? -.

The effect of intensive fishing of wild wrasse populations in Lettercallow Bay, Ireland: implications for the future management of the fishery -.

Survival, osmoregulation and oxygen consumption of wrasse at low salinity and/or low temperature -.

Preliminary breeding trials of wrasse in an intensive system -.

Preliminary trials on the culture of goldsinny and corkwing wrasse.

Part II: Aquaculture Applications. Development and future of cleaner fish technology, and other biological control techniques, in fish farming. Wrasse as cleaner fish of sea lice on farmed Atlantic salmon in west Scotland -.

Large scale use of wrasse to control sea lice and net fouling in salmon farms in Norway -.

Wrasse as cleaner fish, the Shetland experience -.

Parasites and diseases of wrasse being used as cleaner fish on salmon farms in Ireland and Scotland -.

Health status of goldsinny wrasse including a detailed examination of the parasite community at Flodevigen, southern Norway -.

The potential for viral problems related to the use of wrasse (Labridae) in the farming of Atlantic salmon -.

Virulence of Vibrio anguillarum sertypes 01 and 02, Aeromonas salmonicida subsp. salmonicida and atypical Aeromonas salmonicida to goldsinny wrasse -.

Determination of satiation and maintenance rations of goldsinny wrasse fed on mussel meat -.

Successful survival of wrasse through winter in submersible netcages in a fjord in western Norway -.

Wrasse biology and aquaculture applications: commentary and conclusion.

Part III: Appendix. Guidelines for the use of wrasse on salmon farms.

Index

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Sea lice cause huge losses to the salmon industry. Wrasse present an alternative solution to the problem of finding an environmentally acceptable alternative to chemical methods of control. Rapid growth of interest in the use of wrasse since the technique was first used commercially in Norway in 1988 Need for reliable, scientifically sound information and guidance
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