Kim, S., Lim, J., Lee, K. et al. Effect of twine thickness on size-selectivity of driftnet for the yellow croaker Larimichthys polyactis in southwestern Sea of Korea., Chin. J. Ocean. Limnol. 34, 1199–1208 (2016). https://doi.org/10.1007/s00343-016-5107-0
DOI:
Kim, S., Lim, J., Lee, K. et al. Effect of twine thickness on size-selectivity of driftnet for the yellow croaker Larimichthys polyactis in southwestern Sea of Korea., Chin. J. Ocean. Limnol. 34, 1199–1208 (2016). https://doi.org/10.1007/s00343-016-5107-0DOI:
Effect of twine thickness on size-selectivity of driftnet for the yellow croaker Larimichthys polyactis in southwestern Sea of Korea
摘要
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.
关键词
Keywords
references
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