Increasing early life growth of hatchery-reared freshwater fish can improve stocking outcomes
Joshua S. Barrow
A C , Jian D. L. Yen A B , John D. Koehn B and John R. Morrongiello A
+ Author Affiliations
- Author Affiliations
A School of BioSciences, The University of Melbourne, Parkville, Vic. 3010, Australia.
B Applied Aquatic Ecology, Arthur Rylah Institute for Environmental Research, Department of Environment and Primary Industry, 123 Brown Street, Heidelberg, Vic. 3084, Australia.
C Corresponding author. Email: jsbarrow@student.unimelb.edu.au
Marine and Freshwater Research 72(4) 526-533 https://doi.org/10.1071/MF20206
Submitted: 30 June 2020 Accepted: 30 August 2020 Published: 15 October 2020
Abstract
Stock enhancement is an important tool used to rebuild depleted fish populations or enhance recreational fishing. Hatchery-reared individuals can express trait differences, such as growth, which may affect later survival. However, there is little understanding of how early life growth variation affects stocking success. We examined early life growth of golden perch Macquaria ambigua and assessed how growth within hatcheries affects the survival of stocked fish. We measured daily otolith increment widths at 10, 20 and 30 days after hatching, but before stocking into lakes in south-eastern Australia. Mean growth decreased with age, but variation in growth increased. We then compared the early life growth of these individuals to those recaptured after 2 years at liberty (age-2+). Faster individual growth between 20 and 30 days was positively correlated with increased length at stocking. Mean growth between 20 and 30 days of age-2+ fish was higher than that of young-of-year fish, but among-individual variation in growth did not differ between the two groups. These results suggest that individuals with fast hatchery growth have increased survival to 2 years. We propose that enhancing growth within hatcheries may increase the survival of stocked fish, and thus the cost-effectiveness of fish stocking.
Keywords: carryover effects, growth, otoliths, recreational fisheries, stock enhancement, stocking.
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