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Master Thesis

Relationships between growth, physiological and behavioural traits of the European abalone Haliotis tuberculata in the perspective of a selective breeding plan implementation

Abstract : After 10 years of production, France Haliotis, an abalone farm located in Plouguerneau, Brittany, wants to set up a selective breeding plan. The growth and mortality were identified as the two key points to improve in order to make profit. Before to start the selective breeding plan, a phenotype description including growth, behavioural and physiological variables was performed. The aim was to study the relationships between these variables and to find the traits which could be interesting to include in breeding plan as well as the presence of trade off. Seventeen variables were measured on 120 abalone in winter during three weeks of stress exposure related to farm practices (over-density and handling) in laboratory condition and after 2-3 months of rearing in sea cages. The relationships between the variables were studied using principal component analysis and multiple component analysis. The 2-months growth in sea-structure was found to be related with the average movement duration per day during a 24h-activity observation, the gonadic development and inversely related to the latency of return in a turn over test and the phagocytosis efficiency. If these traits are heritable, behavioural tests could be used to assist the selective breeding plan and to evaluate the genetic potential of abalone. In addition, the evolution of the phagocytosis efficiency and the gonadic development need to be followed in order to prevent potential deleterious effects on the growth and on the mortality.
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Master Thesis
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Submitted on : Thursday, December 18, 2014 - 11:39:03 AM
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Sébastien Lachambre. Relationships between growth, physiological and behavioural traits of the European abalone Haliotis tuberculata in the perspective of a selective breeding plan implementation. Agricultural sciences. 2014. ⟨dumas-01096796⟩

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