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Diseases of Aquatic Organisms

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DAO 59:119-123 (2004)  -  doi:10.3354/dao059119

Effect of Vibrio alginolyticus on larval survival of the blue mussel Mytilus galloprovincialis

Casandra Anguiano-Beltrán1,*, Marcial Leonardo Lizárraga-Partida2, Ricardo Searcy-Bernal1

1Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Apartado Postal 453, Ensenada BC 22800, Mexico
2Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Km 107 carret, Tijuana-Ensenada, Ensenada BC 22860, Mexico

ABSTRACT: The effect of increasing concentrations of Vibrio alginolyticus on survival of Mytilus galloprovincialis larvae was studied in a 48 h static bioassay in 1 l glass bottles. Five bacterial densities were tested ranging from 102 to 106 bacteria ml-1. Larval survival and normality (veliger larvae with the typical D-shape) were evaluated after 48 h. An inverse relationship between bacterial concentration and larval survival and normality was observed. In spite of high larval survival (79%) under conditions of high bacterial density (105 bacteria ml-1), the percent of normal larvae was 11%. Besides an irregular shape, abnormal larvae also presented velum reduction. Results from this study suggest that concentrations of V. alginolyticus lower than 103 bacteria ml-1 should be maintained during M. galloprovincialis larval culture.

KEY WORDS: Mussels · Mytilus · Pathogenicity · Vibriosis · Mollusks · Vibrio alginolyticus

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