New Zealand Journal of Marine and Freshwater Research abstracts

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Effect of three conditioning diets on the fatty acid composition of gonads and muscle of Argopecten purpuratus

Hernán Palma-Fleming

Universidad Austral de Chile
Instituto de Química
Facultad de Ciencias
Casilla 567
Valdivia, Chile
email: hpalma@uach.cl

Jorge M. Navarro
Eduardo Peña

Universidad Austral de Chile
Instituto de Biología Marina
Facultad de Ciencias
Casilla 567
Valdivia, Chile

Gloria Martínez

Universidad Católica del Norte
Departamento de Biología Marina
Facultad de Ciencias del Mar
Coquimbo, Chile

Abstract   Mature specimens of Argopecten purpuratus (Lamarck, 1819), obtained from the Culture Center of Tongoy Bay, northern Chile were conditioned at 20°C and fed three different diets (mixture of pure microalgae, microalgae supplemented with a lipid emulsion, and microalgae supplemented with carbohydrates). Fatty acids were analysed at 0, 18, 38, 58, and 72 days of gonad conditioning. Both muscle and gonads showed a significant decrease in the relative distribution (weight % of total fatty acids) of saturated, monounsaturated, and n-6 polyunsaturated fatty acids (mg/g dry weight). Generally, an increase of the n-3 polyunsaturated group was observed for gonads until Day 58, thereafter a decrease was observed, probably as a result of environmental stress. A similar trend was observed for eicosapentaenoic and docosahexaenoic acids. n-3 polyunsaturated fatty acids were the most preserved fatty acids, suggesting their importance as essential fatty acids for gonad maturation. The lipid-supplemented diet afforded the best gonadal maturation and spawning occurred after 72 days.

Keywords   scallop; conditioning diets; Argopecten purpuratus; fatty acid; broodstock conditioning

M01013 Received 27 January 2001; accepted 6 November 2001; published 17 September 2002
New Zealand Journal of Marine and Freshwater Research, 2002, Vol. 36: 605-620
0028-8330/02/3603-0605 $7.00 © The Royal Society of New Zealand 2002

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