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Fish face a trade-off between 'eating big' for growth efficiency and 'eating small' to retain aerobic capacity

journal contribution
posted on 2023-05-19, 14:58 authored by Norin, T, Clark, TD
Feeding provides the necessary energy to fuel all fitness-related processes including activity, growth and reproduction. Nevertheless, prey consumption and digestive processes can have physical and physiological trade-offs with other critical functions, many of which are not clearly understood. Using an ambush predator, barramundi (Lates calcarifer), fed meals ranging 0.6–3.4% of body mass, we examined interrelations between meal size, growth efficiency and surplus aerobic metabolic capacity (aerobic scope, AS). Large meals required a greater absolute investment of energy to process (a larger so-called specific dynamic action, SDA), but the percentage of digestible meal energy required in the SDA response (SDA coefficient) decreased with increasing meal size. Combined with the findings that growth rate and growth efficiency also increased with food intake, our results demonstrate that it is energetically advantageous for fish to select large prey. However, following a large meal, SDA processes occupied up to 77% of the available AS, indicating that other oxygen-demanding activities like swimming may be compromised while large meals are processed. This trade-off between meal size and AS suggests that fishes like barramundi would benefit from regulating prey size based on imminent requirements and threats.

History

Publication title

Biology Letters

Volume

13

Issue

9

Article number

20170298

Number

20170298

Pagination

1-4

ISSN

1744-9561

Department/School

Institute for Marine and Antarctic Studies

Publisher

The Royal Society Publishing

Place of publication

United Kingdom

Rights statement

© 2017 The Author(s)

Repository Status

  • Restricted

Socio-economic Objectives

Coastal or estuarine biodiversity

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