Fatty Acid Composition of Unfed Cod Larvae Gadus morhua L. and Cod Larvae Feeding on Natural Plankton in Large Enclosures

Abstract

Three different groups of cod larvae Gadus morhua L., feeding on natural plankton in two large enclosures, were analyzed for fatty acid composition through development. Unfed control groups and different size‐fractions of plankton were also analyzed. Consistency in changes of fatty acid composition suggests three developmental periods during early larval development. The periods corresponded with dietary shifts in the larvae, but a metabolic origin for changes in certain fatty acids was also evident. In the first period, relative amounts of n‐9 monounsaturates decreased, while n‐3 polyunsaturates together with certain fatty acids abundant in the small‐sized phytoplankton fraction increased. In the second and third periods, relative amounts of the longer n‐3 PUFA decreased, while fatty acids of calanoid copepod origin occurred in one group. The consistency in changes of larval fatty acid profiles in cod suggests development in both lipid absorption and lipid metabolism during ontogenesis.

Comparative Study on the Rabbit Fishes Siganus Canaliculatus Inhabit the Arabian Gulf and Siganus Rivula Tus Inhabit the Red Sea in Saudi Arabia

“…On the other hand, Wodtke, (1981) indicated that the temperature has a good effect on the type and quantity of fatty acids in fishes.it is known that the percentage of long chain polyunsaturated fatty acids In crease in cold-water fishes than in warm-water fishes, and vice versa for the long chain saturated and monounsaturated fatty acids. In the present results, it obvious that the percentage of long chain polyunsaturated fatty acids in Siganus fish was lower than in cold-water fishes such Cod fish (Meeren et aL, 1993) and in Arctic charr fish (Olsen and Henderson, 1997).…”

Fatty acid utilization during the early larval stages of Florida pompano (Trachinotus carolinus) and Common snook (Centropomus undecimalis)

“…), red sea bream (Tandler et al . ), cod (Van der Meeren, Wilhelmsen, Klungsosyr & Kvenseth ), turbot (Rainuzzo et al . ), Senegal sole (Mourente & Vázquez ) common dentex (Mourente et al .…”

Size-related dietary changes observed in young-of-the-year pumpkinseed (Lepomis gibbosus): stomach contents and fatty acid analyses

“…The increase in 18:1n-9 and MUFA with increasing fish length could therefore be a function of increased lipid storage. The preferential retention or synthesis of these fatty acids may provide energy stores in months of low food availability ( Van der Meeren et al 1991;Abi-Ayad et al 2000, 2004. Larger YOY L. gibbosus may switch from low energetic and enriched EFA small prey to larger food items that offer a lower concentration of DHA.…”