|Development of scallop culture methods in British Columbia, Canada (Abstract)|
Miller, H.J. (1989). Development of scallop culture methods in British Columbia, Canada (Abstract), in: De Pauw, N. et al. (Ed.) Aquaculture: a biotechnology in progress: volume 1. pp. 359
In: De Pauw, N. et al. (Ed.) (1989). Aquaculture: a biotechnology in progress: volume 1. European Aquaculture Society: Bredene, Belgium. ISBN 90-71625-03-6. 1-592 pp., more
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|Document type: Conference paper|
A two-year study was undertaken with the aim of devising and testing methods for cost-effective growout of scallops in British Columbia. Three native scallop species (rock scallop, Crassadoma gigantea, spiny scallop, Chlamys hastata and pink scallop, Chlamys rubida) were investigated for compatibility with cage culture and various attachment culture-methods including glueing and ear-hanging. Seed scallops (2.0-30.0mm) of all three scallop species were collected at two deep-water sites situated in Desolation Sound off the eastern coast of Vancouver Island using Japanese spat collection techniques. Of 48 collector units deployed in Jan./Feb. and Mar./Apr. of 1985 at depths of 13 and 14m, 25 were recovered from Sept. 1985 through May 1986. The number of live seed collected totalled 109 358 and consisted of 109 C. gigantea, 2011 C. hastata, and 106024 C. rubida. Additional rock and spiny seed was available as a result of adventitious, natural settlement of both species occurring on suspended oyster stock and from a government hatchery. The compatibility of rock scallops with ear-hanging, glueing, and other attachment growout methods was demonstrated. A batch of several hundred rock scallops subjected to ear-hanging showed an average 31% mortality and losses after 18 months in culture and an average growth rate of 2.7mm per month, compared to growth in lantern nets averaging 2.0mm per month. Spiny and pink scallops were found to be too sensitive to the attachment methods tried. Best growth and survival occurred with restocking and transfer of seed to pearl and lantern nets of increasing mesh size. Rock scallops appear to be the best candidate for culture in British Columbia. Reduction of capital and operating costs could be achieved by substituting string/attachment methods for expensive lantern net methods. Development of rock sca1lop seed source is more problematic.