Ingestion rates and dietary lipids affect growth and fatty acid composition of Dendraster excentricus larvae

摘要: Abstract This study investigated the effect of single and mixed algal diets on growth, fatty acid composition ingestion rates for Dendraster excentricus larvae. Larvae were assigned to three diet treatments Isochrysis galbana , Dunaliella tertiolecta or Rhodomonas sp. four D. I. Small amounts (0.36–0.6%) stearic (18:0) seen in algae used but a relatively large percentage (7–25%) this SAFA was found The alga had highest (51.7%) short chain polyunsaturated (PUFA) linolenic 18:3(n-3) trace (0.02–0.14%) long PUFAs eicosapentanoic (EPA, 20:5(n-3) docosahexanoic acids (DHA, 22:6(n-3)). However, sand dollar larvae demonstrated ability elongate desaturate shorter (18 carbon) longer (20 n-3 PUFA. Thus high levels led EPA low fed diet. stearidonic (18:4(n-3), 38.14%) (10.6%). Despite 18:4(n-3) absent at very alga, any combination alga. DHA(14.3%) almost devoid (0.43%). Although DHA did not incorporate higher these into their lipids compared those . synthesized number 20 22 carbon non-methylene interrupted dienes (NMID), with increasing larval stage. Higher observed ( D ) lower diets. 8-arm presented as When algae, selection particles varied slightly depending stage ingesting more larger cell mixture than 6-arm present suggests that regardless ratios given might have an optimum ratio different sized which they can feed. best leading significantly survival development metamorphosis. second third based growth