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Advances in the aquatic sciences
RESEARCH ARTICLE (Open Access)

Size-selective predation by three estuarine zooplanktivorous fish species

Hayden T. Schilling https://orcid.org/0000-0002-7291-347X A B * , James A. Smith A B , Jason D. Everett A B C , Daniel P. Harrison B D E and Iain M. Suthers https://orcid.org/0000-0002-9340-7461 A B
+ Author Affiliations
- Author Affiliations

A Centre for Marine Science and Innovation, UNSW Sydney, NSW 2052, Australia.

B Sydney Institute of Marine Science, Mosman, NSW 2088, Australia.

C School of Mathematics and Physics, The University of Queensland, Saint Lucia, Qld 4072, Australia.

D Marine Studies Institute, School of Geosciences, University of Sydney, NSW 2006, Australia.

E National Marine Science Centre, Southern Cross University, Coffs Harbour, NSW 2450, Australia.

* Correspondence to: h.schilling@unsw.edu.au

Handling Editor: Daniel Roelke

Marine and Freshwater Research 73(6) 823-832 https://doi.org/10.1071/MF21344
Submitted: 3 December 2021  Accepted: 12 March 2022   Published: 4 May 2022

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC)

Abstract

Context: Zooplanktivorous fish are a key link between abundant zooplankton and higher trophic levels but the foraging behaviour of zooplanktivorous fish is not fully understood. Selective feeding behaviours have been observed, with many species of planktivorous fish targeting certain species and sizes of zooplankton for prey. However, why certain size classes of zooplankton are preferred remains unclear.

Aim: This study investigated prey selection by three zooplanktivorous fish species through the lens of optimal foraging theory.

Methods: We assessed the size structure of zooplankton in the environment and compared this with the size distribution of zooplankton in gut contents from three zooplanktivorous fish.

Key results: The targeted prey size of Atypichthys strigatus and Scorpis lineolata aligns with the prey size classes in the environment that contain the highest overall biomass. Trachurus novaezelandiae showed little evidence of targeting these size classes.

Conclusions: These prey sizes therefore represent the most efficient prey to target because the return on foraging effort is greatest. By contrast, T. novaezelandiae showed only an underselection of large and small prey.

Implications: By incorporating this information on this key trophic link between zooplankton and fish, ecosystem models could better resolve the size dependant predation, particularly in size-based models.

Keywords: Atypichthys strigatus, diet, estuarine ecosystem, gut contents, laser optical plankton counter, optimal foraging theory, planktivory, prey choice, Scorpis lineolata, Trachurus novaezelandiae.


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