Journal
ICES JOURNAL OF MARINE SCIENCE
Volume 71, Issue 5, Pages 1100-1106Publisher
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fst209
Keywords
acoustic telemetry; habitat use; mulloway; restocking; sea ranching; space use; stock enhancement
Categories
Funding
- Recreational Fishing Trust [L40]
- Australian Research Council Linkage [LP0775000]
- Australian Research Council [LP0775000] Funding Source: Australian Research Council
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Targeted stocking involves the release of fish directly into high-quality habitat, however this is often time-consuming, expensive and difficult. Acoustically tagged hatchery-reared juvenile mulloway Argyrosomus japonicus were released in groups directly into deep-hole habitat preferred by wild conspecifics (targeted stocking), or in a non-targeted fashion near easily accessible sites that lacked high-quality habitats in the direct vicinity. Fish were tracked continuously, 24 h d(-1), for 5 d following release. Fish released in a targeted fashion showed lower mean activity rates (50% less movement) and occupied higher quality habitats than fish released in a non-targeted fashion. Fish released in a non-targeted fashion also used a greater number of smaller habitat patches. The implications for improvements in behaviour and habitat usage patterns for fish released in a targeted fashion, such as improved growth and survival, are discussed. Identifying and releasing fish directly into the species' high-quality habitat may ultimately improve the success of stocking programs.
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