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Advances in the aquatic sciences
REVIEW (Open Access)

Otoliths as individual indicators: a reappraisal of the link between fish physiology and otolith characteristics

Peter Grønkjær
+ Author Affiliations
- Author Affiliations

Department of Bioscience, Aquatic Biology, Aarhus University, Ole Worms Allé 1, DK-8000 Aarhus C, Denmark. Email: peter.groenkjaer@biology.au.dk

Marine and Freshwater Research 67(7) 881-888 https://doi.org/10.1071/MF15155
Submitted: 16 April 2015  Accepted: 23 December 2015   Published: 18 March 2016

Journal Compilation © CSIRO Publishing 2016 Open Access CC BY-NC-ND

Abstract

Otoliths are remarkable recorders that store visual and chemical information that can be interpreted with regard to individual fish phenotype trajectory, life history events and environment. However, the information stored in the otoliths must be interpreted with the knowledge that the otolith is an integral part of fish sensory systems. This means that the environmental signals recorded in the otoliths will be regulated by the homeostatic apparatus of the individual fish – its physiology and ultimately its genetic make-up. Although this may complicate interpretation of environmental signals, it also opens up avenues for new research into the physiology and life history of individual fish. This review focuses on research areas where the coupling between otolith characteristics and fish physiology may yield new insights. Most of the research ideas are by no means new, but rather represent largely forgotten or less-explored research areas. Examples of questions that are fundamental, unanswered and with the potential to yield significant new insights are those related to the coupling of otolith and fish growth through metabolism, and the formation of opaque and translucent growth zones in relation to the physiology of the individual. An integration of visual and chemical data with bioenergetic modelling may yield some of the answers.

Additional keywords: environment, genotype, metabolism, opaque and translucent zones, stable isotopes, viability.


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