Field observations on growth, gametogenesis, and sex ...

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Title Field observations on growth, gametogenesis, and sex ratio of triploid and diploid Mytilus edulis
Author(s) J. Brake, J. Davidson, J. Davis
Journal Aquaculture
Date 2004
Volume 236
Issue 1
Start page 179
End page 191
Abstract Triploid shellfish are sterile and retain product quality during, and after the spawning period. Field evaluations of diploid and triploid mussels demonstrated that triploids had a greater growth rate than diploids. The growth difference was evident in the first growing year after deployment in a high growth site. This difference was not detectable in a low growth site until the second year after deployment, suggesting possible differential growth of triploids versus diploids, related to environment. Diploid mussels in the low growth site were notably less sexually mature in the first year; therefore, the differential performance of triploids between test sites may have been related to spawning. After 11 months in the field, triploids had a mean shell length 1.05% (P=0.48) larger than diploids in the low growth site versus 8.09% (P<0.001) larger in the high growth site. Triploids examined after a spawning event showed no histological evidence of spawning, while 71% of diploids showed some evidence of spawning. Shell length, relative soft tissue weight, and condition index were all higher in triploids. This resulted in a maximum observed increase in dry tissue weight of 62.82% and a mean shell length increase of 10.95% when triploids were compared to diploids after the local spawning event. A highly skewed sex ratio in triploid mussels, in favor of males, confirmed a similar observation in triploid Mytilus galloprovincialis.

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