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Type: Journal article
Title: Transgenerational marking of freshwater fishes with enriched stable isotopes: a tool for fisheries management and research
Author: Munro, A.
Gillanders, B.
Thurstan, S.
Crook, D.
Sanger, A.
Citation: Journal of Fish Biology, 2009; 75(3):668-684
Publisher: Blackwell Publishing Ltd
Issue Date: 2009
ISSN: 0022-1112
Abstract: A promising new method of marking larval freshwater fishes with enriched stable isotopes by means of injecting the maternal parent with the marking agent was investigated. The (138)Ba:(137)Ba ratios in the otoliths of larval golden perch Macquaria ambigua were compared to determine the effect of injecting female broodstock with different dosages of enriched (137)Ba at various times before spawning. There was 100% mark success in the progeny of fish injected with 20 microg g(-1) of enriched (137)Ba 24 h before inducing spawning with hormones and 40 microg g(-1) administered at the same time as inducement of spawning. Injection of 40 microg g(-1) enriched (137)Ba 21 days before spawning resulted in only 81% mark success and suggests rapid elimination of barium in M. ambigua. Injection with enriched (137)Ba did not significantly affect the fertilization rate, number of fertilized eggs or hatching rate compared with long-term hatchery records. These results suggest that transgenerational marking is an effective and affordable means of mass-marking larval fishes. Thousands of larval fishes can be permanently marked with a unique artificial isotopic mark via a single injection into the maternal parent, thus avoiding the handling of individual fishes or having to deal with chemical baths. Because no single mark or tagging method is suitable for all situations, transgenerational marking with enriched stable isotopes provides another method for researchers and managers to discriminate both hatchery-reared and wild fishes.
Keywords: barium isotopes; connectivity; Macquaria ambigua; mass marking; otolith chemistry; stock enhancement
Description: Journal compilation © 2009 The Fisheries Society of the British Isles
RMID: 0020092885
DOI: 10.1111/j.1095-8649.2009.02352.x
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute Leaders publications
Environment Institute publications

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