Effects of Three Microalgal Diets Varying in LC-PUFA Composition on Growth, Fad, and Elovl Expressions, and Fatty Acid Profiles in Juvenile Razor Clam Sinonovacula constricta

Author:

Kong Fei1,Ran Zhaoshou12ORCID,Xie Haixuan1,Tian Xuxu1,Liao Kai1ORCID,Xu Jilin123

Affiliation:

1. Key Laboratory of Aquacultural Biotechnology, Ministry of Education, Ningbo University, Ningbo 315211, China

2. Key Laboratory of Marine Biotechnology of Zhejiang Province, Ningbo 315211, China

3. Fujian Dalai Seeding Technology Co., Ltd., Fuzhou 350600, China

Abstract

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.

Funder

National Natural Science Foundation of China

Ningbo Science and Technology Research Projects, China

Publisher

MDPI AG

Subject

Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics

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