Effect of fish size, handling stresses and training procedure on the swimming behavior of hatchery-reared striped jack: implications for stock enhancement

The marine ranching of striped jack (Pseudocaranx dentex) in Japan is a new type of fishery enhancement that releases cultured juveniles and keeps them in coastal waters without cages, utilizing their behaviour of associating with floating objects. To improve the release strategies, the behaviour of...

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Bibliographic Details
Published in:Aquaculture 2000-05, Vol.185 (3-4), p.245-256
Main Authors: Kuwada, Hiroshi, Masuda, Reiji, Shiozawa, Satoshi, Kogane, Takayuki, Imaizumi, Keinosuke, Tsukamoto, Katsumi
Format: Article
Language:English
Subjects:
Animal aquaculture
Animal productions
Aquaculture
Biological and medical sciences
Conditioning
Fish
Fish hatcheries
Fundamental and applied biological sciences. Psychology
Marine
Marine ranching
Pisciculture
Pseudocaranx dentex
Release
Stock enhancement
Stress
Vertebrate aquaculture
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Summary:The marine ranching of striped jack (Pseudocaranx dentex) in Japan is a new type of fishery enhancement that releases cultured juveniles and keeps them in coastal waters without cages, utilizing their behaviour of associating with floating objects. To improve the release strategies, the behaviour of released fish under different conditions was observed directly using SCUBA. We found that factors of fish size, the amount of handling stress and trained feeding behaviour had an impact on the potential loss of the juveniles from the release site. Large juveniles (115 mm) showed a greater potential for loss from the release site than smaller juveniles (59 mm) due to diving deeper immediately after release (an average of 5.4 vs. 4.1 m, respectively). Stressed fish dived deeper than fish provided with a vertical underwater structure (average of 8.5 vs. 3.8 m, respectively). Fish trained to respond to sound for feeding dived to a more shallower depth (3.3 m) and stayed near the release site. Handling stress before release may be the main cause of the loss of fish from the release site, while training showed great potential for improving fish retention at the release site.
ISSN:0044-8486
1873-5622
DOI:10.1016/S0044-8486(99)00361-0