A1 Journal article (refereed)
Lowered nutritional quality of prey decrease the growth and biomolecule content of rainbow trout fry (2022)

Taipale, S. J., Pulkkinen, K., Keva, O., Kainz, M. J., & Nykänen, H. (2022). Lowered nutritional quality of prey decrease the growth and biomolecule content of rainbow trout fry. Comparative Biochemistry and Physiology B: Biochemistry and Molecular Biology, 262, Article 110767. https://doi.org/10.1016/j.cbpb.2022.110767

JYU authors or editors

Publication details

All authors or editors: Taipale, Sami J.; Pulkkinen, Katja; Keva, Ossi; Kainz, Martin J.; Nykänen, Hannu

Journal or series: Comparative Biochemistry and Physiology B: Biochemistry and Molecular Biology

ISSN: 1096-4959

eISSN: 1879-1107

Publication year: 2022

Publication date: 23/05/2022

Volume: 262

Article number: 110767

Publisher: Elsevier Inc.

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1016/j.cbpb.2022.110767

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/82320

Abstract

Diet quality is crucial for the development of offspring. Here, we examined how the nutritional quality of prey affects somatic growth and the lipid, carbohydrate, protein, amino acid, and polyunsaturated fatty acid content of rainbow trout (Oncorhynchus mykiss) fry using a three-trophic-level experimental setup. Diets differed especially in their content of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), which are physiologically essential polyunsaturated fatty acids for a fish fry. Trout were fed with an artificial diet (fish feed, DHA-rich), marine zooplankton diet (krill/Mysis, DHA-rich), or freshwater zooplankton diet (Daphnia, Cladocera, DHA-deficient). The Daphnia were grown either on a poor, intermediate, or high-quality algal/microbial diet simulating potential changes in the nutritional prey quality (EPA-content). Trout fed with the fish feed or marine zooplankton entirely replaced their muscle tissue composition with compounds of dietary origin. In contrast, fish tissue renewal was only partial in fish fed any Daphnia diet. Furthermore, fish grew five times faster on marine zooplankton than on any of the Daphnia diets. This was mainly explained by the higher dietary contents of arachidonic acid (ARA), EPA, and DHA, but also by the higher content of some amino acids in the marine zooplankton than in the Daphnia diets. Moreover, fatty acid-specific carbon isotopes revealed that trout fry could not biosynthesize ARA, EPA, or DHA efficiently from their precursors. Our results suggest that changes in the zooplankton and macroinvertebrate communities' structure in freshwater habitats from DHA-rich to DHA-poor species may reduce the somatic growth of fish fry.

Keywords: aquatic ecosystems; eutrophication; food webs; fishes; rainbow trout; animal young; plankton; Cladocera; nutritional value; nutrients (animals and humans); fatty acids; omega fatty acids

Free keywords: eutrophication; freshwater food webs; phytoplankton; daphnia; fish; docosahexaenoic acid; polyunsaturated fatty acids

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Ministry reporting: Yes

VIRTA submission year: 2022

JUFO rating: 1