Yields of great scallop Emphasis Type="Italic"P

Authors: Thorolf Magnesen Øivind Bergh Gyda Christophersen

Publish Date: 2006/02/01

Volume: 14, Issue: 4, Pages: 377-394

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Abstract

Survival growth and yield of competent great scallop Pecten maximus larvae were investigated during a full production season in a commercial hatchery in western Norway Broodstock were collected from natural scallop beds and 12 groups were induced to spawn during the period December 2002 to July 2003 Larvae were reared on a large scale in 36 flowthrough tanks 3500 l at 17±1 °C and continuously fed a mixture of five algal species produced in an indoor continuousflow system Large variations in larval performance between spawning groups and tanks were observed but the results were as good as earlier results using the batch system and prophylactic addition of chloramphenicol Growth from days 3–24 averaged 48 μm day−1±08 sd and survival 224±218 sd Mean yield of day 3 larvae was 71±100 sd and 266±259 sd for those surviving to day 24 Yield was significantly correlated to larval survival Larval success was related to initial larval density algal concentration and season It was found that the best production regime had an initial larval density lower than 6 ml−1 and algal concentration of less than 12 μl−1 regardless of season Seventeen tanks met these criteria and produced a mean yield of 05 larvae ml−1 to settlement Flowthrough systems are currently regarded as the only feasible method for viable hatchery production of P maximus larvae in Norway

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