TY - JOUR
T1 - Net-chasing training improves the behavioral characteristics of hatchery-reared red sea bream (Pagrus major) juveniles
AU - Takahashi, Kohji
AU - Masuda, Reiji
N1 - Funding Information:
The present study was supported by the Grant-in-Aid for JSPSJapan Society for the Promotion of Science London Fellows (JSPS KAKENHI grant No. JP8). We thank Alistair Coulthard and two reviewers whose comments substantially improved the quality of the manuscript
Funding Information:
The present study was supported by the Grant-in-Aid for JSPS Fellows (JSPS KAKENHI grant No. JP8). We thank Alistair Coulthard and two reviewers whose comments substantially improved the quality of the manuscript.
PY - 2018
Y1 - 2018
N2 - The low return rate of fish released for stock enhancement has often been attributed to hatchery-reared fish having inferior behavioral characteristics. We tried to improve the behavioral characteristic of red sea bream (Pagrus major) juveniles by using a net-chasing treatment. The fish were provided with 2 min of net chasing twice daily for 3 weeks, following which their behavioral characteristics (emergence from a start area, avoidance response to novel stimulus, and foraging following transfer between tanks) were individually tested and compared with a control group. A predator exposure test was then conducted using marbled rockfish (Sebastiscus marmoratus). Net-chased fish exhibited a shorter latency to emergence, a higher avoidance rate, and an earlier foraging time than the control fish, indicating that the net-chasing treatment may improve adaptability for environmental change and alertness to a novel object. The net-chased fish also exhibited a better survival rate than the control fish, with an odds ratio of 6.76. We suggest that net-chasing training represents an easy and efficient method for improving the behavior of fish for stock enhancement.
AB - The low return rate of fish released for stock enhancement has often been attributed to hatchery-reared fish having inferior behavioral characteristics. We tried to improve the behavioral characteristic of red sea bream (Pagrus major) juveniles by using a net-chasing treatment. The fish were provided with 2 min of net chasing twice daily for 3 weeks, following which their behavioral characteristics (emergence from a start area, avoidance response to novel stimulus, and foraging following transfer between tanks) were individually tested and compared with a control group. A predator exposure test was then conducted using marbled rockfish (Sebastiscus marmoratus). Net-chased fish exhibited a shorter latency to emergence, a higher avoidance rate, and an earlier foraging time than the control fish, indicating that the net-chasing treatment may improve adaptability for environmental change and alertness to a novel object. The net-chased fish also exhibited a better survival rate than the control fish, with an odds ratio of 6.76. We suggest that net-chasing training represents an easy and efficient method for improving the behavior of fish for stock enhancement.
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U2 - 10.1139/cjfas-2017-0073
DO - 10.1139/cjfas-2017-0073
M3 - Article
AN - SCOPUS:85047820803
VL - 75
SP - 861
EP - 867
JO - Canadian Journal of Fisheries and Aquatic Sciences
JF - Canadian Journal of Fisheries and Aquatic Sciences
SN - 0706-652X
IS - 6
ER -