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Mesh Selectivity of Beam Trawl for Shrimps

새우조망의 망목선택성

  • Published : 2004.02.01

Abstract

This study was conducted to mesh selectivity of Beam trawl for shrimps fishing experiment in the coastal waters around Geomundo, South sea of Korea, during from Oct. to Nov. 2002. The selectivity parameters of big head shrimp (Solenocera melantho) have been studied on the covered con-end method. with mesh of 8, 38, 51 and 61 mm. Selection curves and selection parameters were calculated by using a logistic function S=1/(1+exp-(aCL+b)). The mesh selection master curves were estimated by S=1/(1+exp$^{({\alpha}(CL/M)+{\beta}}$), and the optimum mesh size were calculated with (L/M)50 of master curve. Optimum mesh size and selectivity master curves for the southern rough shrimp (Yrachysalambria curvirostris) and smoothshell shrimp (Parapenaeopsis tenella) optimum mesh size and selectivity master curves were estimated by big head shrimp master curves. The results obtained are summarized as follows : Selection parameters '${\alpha}$' and '${\beta}$' of the master curve for big head shrimp were 8.84 and -5.89, and The selection factor of the master curve (L/M)$_{50}$ was 0.67. The optimum mesh size of minimum length for sexual maturity for big head shrimp was 30.7 mm. Estimated (L/M)$_{50}$ for southern rough shrimp and smoothshell shrimp by using the master curve of big head shrimp was 0.73 and the optimum mesh sizes were 25.5 mm for southern rough shrimp and 16.9 mm for smoothshell shrimp, respectively.

Keywords

Solenocera melantho;Trachysalambria curvirostris;Parapenaeopsis tenella;mesh selectivity;optimum mesh sizes

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  2. Size Selectivity of a Shrimp Beam Trawl for the Southern Rough Shrimp Trachysalambria curvirostris with the Extended SELECT Method vol.44, pp.4, 2011, https://doi.org/10.5657/KFAS.2011.0390
  3. Catching efficiency of a shrimp beam trawl according to the length of beam and wing net and its influence on the hauling work vol.50, pp.3, 2014, https://doi.org/10.3796/KSFT.2014.50.3.396