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http://dx.doi.org/10.3796/KSFT.2012.49.3.188

A study on the selectivity of grid type escape device for the reduction of small size of fish in set net  

Kim, Tae-Kyung (Department of Fisheries Physics, Graduation school, Pukyong National University)
Kim, Hyung-Seok (Division of Marine Production System Management, Pukyong National University)
Lee, Ju-Hee (Division of Marine Production System Management, Pukyong National University)
Kim, Seonghun (Fisheries system engineering Division, NFRDI)
Publication Information
Journal of the Korean Society of Fisheries and Ocean Technology / v.49, no.3, 2013 , pp. 188-199 More about this Journal
Abstract
This thesis is the fundamental study on the adaptation of escape device for reducing small size of fish in set-net. The escape devices for experiments were made the grid-type devices with three different slit sizes (15, 20 and 25mm). The experiments of size selectivity on escape devices were conducted by using two kinds of species as black rockfish (Sebastes schlegeli) and sea perch (Lateolabrax maculatusi) in the experimental tank. The size selectivity curve was fitted by using a logistic function and the parameters of selectivity curve were estimated by a maximum likelihood method. In the results; 50% selection ranges for the grid-type escape devices with three different slit sizes were; a black rockfish was 13.30, 19.22 and 22.06cm and a sea perch was 17.64, 20.91 and 22.78cm, respectively. The 50% selection range of a black rockfish was wilder than a sea perch about 1.1~1.3 time. Therefore, the small size of fish are able to reduce by using the grid type escape device. However, the optimum slit size of grid should be decided to consider the size of target species and economics of catches.
Keywords
Set net; Escape device; Grid; Selectivity; Bycatch;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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