Comparisons on pursing drag of a Peruvian small purse seine

Measurement of the pursing drag during a fishing operation is more difficult than that of the hauling drag. Due to lack of studies on mechanical properties of purse seine, the verification of the results obtained for the pursing drag is difficult at present. In this study, the pursing drag of a Peruvian small purse seine was calculated by applying the method of Miyoshi and that of the authors. In an equilibrium condition of the force and at a standard fishing operation, the purisng drag calculated by the method of Miyoshi was 473kgw, while that by the method of the authors was 478kgw. The results obtained by the two methods were in close agreement. It was found that both methods were applicable in determining the pursing drag of a rectangular purse seine. The method of Miyoshi, however, required some numerical analysis while the method of the authors was simple to apply.