New Zealand Journal of Marine and Freshwater Research abstracts
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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