Cite this paper:
Seonghun KIM, Jihyun LIM, Kyounghoon LEE, Seongwook PARK. Effect of twine thickness on size-selectivity of driftnet for the yellow croaker Larimichthys polyactis in southwestern Sea of Korea[J]. Journal of Oceanology and Limnology, 2016, 34(6): 1199-1208

Effect of twine thickness on size-selectivity of driftnet for the yellow croaker Larimichthys polyactis in southwestern Sea of Korea

Seonghun KIM1, Jihyun LIM1, Kyounghoon LEE2, Seongwook PARK1
1 Fisheries Engineering Research Division, NIFS 46083, Koera;
2 School of Marine Technology, Chonnam National University, Yeosu 59626, Korea
Abstract:
In order to determine the effect of twine thickness on the size-selectivity of the driftnet used for the yellow croaker, size-selectivity tests were conducted with three different twine thicknesses (monofilament diameters of 0.279 mm (number's method; No. 3), 0.321 mm (No. 4), and 0.360 mm (No. 5)) of driftnets for the yellow croaker in the seas around Chooja-do, Jeju Islands. The selectivity curve was estimated by using Kitahara's method. In order to determine the physical properties of the twine used in the experimental fishing nets, we measured the breaking load, elongation, and stiffness under both dry and wet conditions. In terms of physical properties, the thinnest twine (No. 3) had the strongest breaking strength per unit cross-sectional area, along with good elongation and excellent flexibility. The thickest twine (No. 5) had the lowest flexibility. In terms of selectivity, the net of No. 3 twine showed the broadest selection range and, thus, a relatively low selectivity compared with the other nets, while the less flexible net of No. 5 twine showed the narrowest selectivity range and high selectivity. In addition, it was found that a thicker twine resulted in a smaller haul of small fish. Therefore, it can be inferred that the thickness of the twine affects the size of the catch and selectivity, and thus the size composition of the catch as well.
Key words:    yellow croaker|driftnet|size selectivity|Kitahara's method|twine thickness   
Received: 2015-04-05   Revised: 2015-07-08
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Articles by Jihyun LIM
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