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Quantitative estimation of the predation of marine ranched striped jack Pseudocaranx dentex by herons

Quantitative estimation of the predation of marine ranched striped jack Pseudocaranx dentex by herons

Authors :
Atsushi Ohno
Harunao Nibe
Kazutaka Sakiyama
Naoki Suzuki
Shinsuke Morioka
Source :
Fisheries Science. 76:473-480
Publication Year :
2010
Publisher :
Springer Science and Business Media LLC, 2010.

Abstract

The Goto station of the Japan Sea-Farming Association conducted marine ranching experiments with striped jack Pseudocaranx dentex from 1988 to 1999 in the Goto Islands, Nagasaki, Japan. Marine ranching is a stocking method where released fish are fed for some period after release in order to decrease initial mortality from starvation. Ranched fish were fed for 0, 90, and 15 days after stocking in 1997, 1998, and 1999, respectively. During the experiment, herons (grey heron Ardea cinerea, black-crowned night heron Nycticorax nycticorax, and great egret Egretta alba) were often observed preying on released fish in the ranching area. The present study estimated the number of fish preyed upon by herons during observation periods in 1997, 1998, and 1999 from the number of herons that flew into the ranching area and the predation rate on ranched fish by herons. The former was counted during sightings. The latter was estimated from the sighting observations and heron regurgitations. The number of herons that flew into the ranching area increased with the feeding period. The numbers of fish lost to predation by herons in 1997, 1998, and 1999 were estimated to be 0, 5,741, and 829, respectively.

Details

ISSN :
14442906 and 09199268
Volume :
76
Database :
OpenAIRE
Journal :
Fisheries Science
Accession number :
edsair.doi...........e3b27e2e2c24e0ea8b4dbc33ee0910e0
Full Text :
https://doi.org/10.1007/s12562-010-0229-3