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Effects of Three Microalgal Diets Varying in LC-PUFA Composition on Growth, IFad/I, and IElovl/I Expressions, and Fatty Acid Profiles in Juvenile Razor Clam ISinonovacula constricta/I
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Effects of Three Microalgal Diets Varying in LC-PUFA Composition on Growth, IFad/I, and IElovl/I Expressions, and Fatty Acid Profiles in Juvenile Razor Clam ISinonovacula constricta/I
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Effects of Three Microalgal Diets Varying in LC-PUFA Composition on Growth, IFad/I, and IElovl/I Expressions, and Fatty Acid Profiles in Juvenile Razor Clam ISinonovacula constricta/I
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Journal Article
Effects of Three Microalgal Diets Varying in LC-PUFA Composition on Growth, IFad/I, and IElovl/I Expressions, and Fatty Acid Profiles in Juvenile Razor Clam ISinonovacula constricta/I
2023
Overview
The razor clam Sinonovacula constricta is the first marine mollusk demonstrated to possess the complete long-chain polyunsaturated fatty acids (LC-PUFA) biosynthetic pathway. This study explored the impact of different microalgae on growth, Fad and Elovl expressions, and fatty acid (FA) profiles in juvenile S. constricta. Results revealed that juveniles fed with Isochrysis galbana (rich in DHA) or Chaetoceros calcitrans (rich in EPA) consistently exhibited higher growth than those fed Chlorella sp. (rich in LA and ALA), underscoring the importance of dietary LC-PUFA in S. constricta’s development. Expression of most Fad and Elovl in C. calcitrans and I. galbana-fed juveniles were initially up-regulated, then down-regulated, suggesting LC-PUFA demand for faster growth. Although Chlorella sp.-fed juveniles exhibited decreased mRNA levels for most genes, levels were notably higher lately compared to those fed C. calcitrans or I. galbana, hinting at potential LC-PUFA biosynthesis induction. FA profiles in S. constricta generally mirrored those in ingested microalgae, implying direct FA accumulation from diets. Some microalgal FA were absent in farmed S. constricta, while others emerged, indicating S. constricta’s ability to selectively accumulate and synthesize FA. This study enhances the understanding of dietary FA metabolism in S. constricta, valuable for selecting appropriate microalgae in its farming practices.
Publisher
MDPI AG
Subject
