Growth, survival and fatty acid composition ofRhamdia quelen(Quoy and Gaimard, 1824) larvae fed on artificial diet alone or in combination withArtemianauplii

Abstract

Growth, survival and fatty acid composition ofRhamdia quelen (Quoy and Gaimard, 1824) larvae fed on artificial diet alone or in combination with Artemia nauplii Abstract Black catfish (Rhamdia quelen) is a species of interest for aquaculture in Brazil, Argentina and Uruguay. A feeding trial was conducted to evaluate the effect of feeding R. quelen larvae on either only an artificial diet or in combination with Artemia nauplii (AN) on larval performance and fatty acid composition. For 12 days, larvae were fed from first feeding (3 days after hatching, TL = 5.88 ± 0.23 mm) with artificial food only or a combination of artificial food and AN (co-feeding). At the end of the trial, total length of co-fed larvae was significantly higher than that of larvae fed solely artificial food (P < 0.001). No significant differences were found in survival rates. Co-feeding microdiet with a small amount of AN significantly affected larval fatty acid composition. Lipid and fatty acid composition of food and larvae revealed the importance of n-3 fatty acids for growth of black catfish larvae and that, as most freshwater fish, R. quelen larvae can elongate and desaturate linolenic acid to n-3 highly unsaturated fatty acids. Results suggest that R. quelen larvae can be fed from first feeding on microdiets as unique food source, although better larval performances are obtained by co-feeding with a small amount of AN.

Growth performance, survival and body composition of southern flounderParalichthys lethostigmalarvae fed different formulated microdiets

“…In general, the fatty acid composition of the fish whole body reflected the composition of their diets (Salhi & Bessonart ). The lipid sources of the commercial microdiet used in this study (Otohime) are unknown.…”

“…and brine shrimp Artemia are considered to be essential for the production of marine fish juveniles (Baskerville‐Bridges & Kling ; Sorgeloos, Dhert & Candreva ). However, high costs and labour requirements along with the highly variable nutritional value of live feeds and the unreliability of mass cultures associated with the production of live feeds illustrate the need to find viable alternatives (Holt ; Baskerville‐Bridges & Kling ; Salhi & Bessonart ). Moreover, the provision of live food is characteristically plagued with variable supply and nutritional quality.…”

Diet estimation of Paralichthys orbignyanus in a coastal lagoon via quantitative fatty acid signature analysis

“…Samples were injected in split mode at 250°C. FAs were identified by comparing retention times of methyl esters standards (Supelco) and by reference to a well characterized fish oil (Salhi and Bessonart, 2013). FA data were expressed as the mass percentage of total FA ± sd.…”

Effect of defatted microalgae (Scenedesmus obliquus ) biomass inclusion on growth performance of Rhamdia quelen (Quoy & Gaimard, 1824)

“…Rhamdia quelen (Quoy & Gaimard, 1824) (Siluriformes: Heptapteridae) is an omnivorous freshwater fish, which occurs from Central Argentina to the south of Mexico (Silfvergrip, ). It is the main species farmed in the southern portion of South America for its rapid growth rate during the warm months, while also withstanding rigorous winters (Pereira et al, ; Salhi and Bessonart, ).…”