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

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 M01013;

Reproductive Conditioning of the Peruvian Scallop Argopecten purpuratus in Different Environments

“…[45]. It appears that gonadal maturation responses are linked to the lipid and protein content of the diet of the purple scallop A. purpuratus [46].…”

“…Even an increase in oocyte diameter can imply an increase in yolk content [19]. Therefore, the larger oocyte size observed in the natural state is associated with a high accumulation of energy reserves, especially lipids [38,43,46,47], such as polyunsaturated fatty acids (HUFA), which are part of the matrix and cell membranes [10,48]. In this study, significant differences were found in the lipid content of the oocytes with values of 98.9 ± 8.3 mg g −1 dry mass and 41.6 ± 6.7 mg g −1 dry mass in the natural (environment) and (hatchery) conditions, respectively.…”

Ácidos grasos en cepas de microalgas del Banco de Germoplasma de Organismos Acuáticos del Instituto del Mar del Perú (IMARPE)

“…Este último ácido graso es importante en el proceso de la metamorfosis de las larvas a estadios juveniles acelerando el crecimiento del bivalvo (Farías & Uriarte 2006). En organismos adultos el DHA y el AA son utilizados para la maduración de la gónada y del músculo abductor (Palma-Fleming et al 2002). Las especies de microalgas más utilizadas para alimentación de estos moluscos son Isochrysis galbana y Chaetoceros calcitrans por la proporción de ácidos grasos (DHA: EPA), mejor digestibilidad y aporte de otros minerales esenciales para la formación y fortalecimiento de valvas (Navarro et al 2000).…”

A Diet Rich in HUFAs Enhances the Energetic and Immune Response Capacities of Larvae of the Scallop Argopecten purpuratus

“…The incorporation of highly unsaturated fatty acids (HUFAs) in the larval diet of some bivalve mollusks is crucial for growth, development, metamorphosis, and settlement [ 32 , 33 , 34 , 35 ]. Mollusks, like other invertebrates, are incapable of synthesizing HUFAs de novo; thus, these fatty acids must be obtained from the diet, which mainly comprises microalgae [ 36 ]. Lipids, and especially HUFAs, perform two major functions: (1) eicosapentaenoic (EPA: 20:5-ω3) and docosahexaenoic (DHA: 22:6-ω6) acids are elements of cellular membrane phospholipids (polar lipids) and are involved in preserving membrane integrity, fluidity, and biological functionality; and (2) fatty acids are components of triglycerides, which are a main energy source for metabolism [ 37 ].…”