SDA coefficient is temperature dependent in rainbow trout (Oncorhynchus mykiss, Walbaum 1792) in a practical approach using group respirometry

Philipp Segler; Klaus Heinrich Vanselow; Michael Schlachter; Mario Hasler; Carsten Schulz

doi:10.1016/j.cbpb.2023.110832

SDA coefficient is temperature dependent in rainbow trout (Oncorhynchus mykiss, Walbaum 1792) in a practical approach using group respirometry

Comp Biochem Physiol B Biochem Mol Biol. 2023 Apr-May:265:110832. doi: 10.1016/j.cbpb.2023.110832. Epub 2023 Jan 25.

Authors

Philipp Segler¹, Klaus Heinrich Vanselow², Michael Schlachter³, Mario Hasler⁴, Carsten Schulz⁵

Affiliations

¹ Fraunhofer Research Institution for Individualized and Cell-Based Medical Engineering, Aquaculture und Aquatic Resources, Hafentörn 3, 25761 Büsum, Germany. Electronic address: p.segler@hotmail.de.
² Forschungs- und Technologiezentrum Westküste, Christian-Albrechts-Universität zu Kiel, Hafentörn 1, 25761 Büsum, Germany.
³ Fraunhofer Research Institution for Individualized and Cell-Based Medical Engineering, Aquaculture und Aquatic Resources, Hafentörn 3, 25761 Büsum, Germany.
⁴ Institute of Animal Breeding and Husbandry, Marine Aquaculture, Christian-Albrechts-Universität zu Kiel, Olshausenstraße 40, 24098 Kiel, Germany.
⁵ Fraunhofer Research Institution for Individualized and Cell-Based Medical Engineering, Aquaculture und Aquatic Resources, Hafentörn 3, 25761 Büsum, Germany; Institute of Animal Breeding and Husbandry, Marine Aquaculture, Christian-Albrechts-Universität zu Kiel, Olshausenstraße 40, 24098 Kiel, Germany.

PMID: 36706829
DOI: 10.1016/j.cbpb.2023.110832

Abstract

Rising global temperatures have raised the need for detailed knowledge of the effects of rising temperatures on the physiology of animals used in aquaculture. Here we used a multifactorial bioenergetic approach using groups of rainbow trout (Oncorhynchus mykiss) with an average single fish weight of 183.75 g ± 0.65 g to investigate the interactions of feeding and temperature with key metabolic variables. We used a recirculating aquaculture respirometry system (RARS) to test three ration sizes (0.65; 0.975; 1.3% of live body weight (BW)) over a range of three consecutive temperatures (14; 17; 20 °C). The fish were fed once per day for 6 days at each temperature and subsequently starved for 5 days to return to standard metabolic rate (SMR). This study aimed to answer the highly discussed topic of the temperature dependency of key metabolic specific dynamic action (SDA)-variables SDA_coef and SDA_dur. We were able to provide evidence, that in rainbow trout the SDA_coef is highly dependent on the environmental temperature in the first ever approach to assess these variables in a group respirometer with this species. We compared the results of this study with a sophisticated bioenergetic model by Elliot and Hurley (2002) and thereby provide evidence for the practicability of group respirometry as a method to assess bioenergetic data under culture like conditions.

Keywords: Group respirometry; Rainbow trout; Ration size; SDA; Temperature.

MeSH terms

Animals
Energy Metabolism
Oncorhynchus mykiss*
Temperature