The difference of selectivity of gill net between least square method with polynomials in Kitahara s and maximum likelihood analysis

Abstract

This paper showed the difference between the selectivity of gill net by least square method with polynomials inKitahara s and that by maximum likelihood analysis for Japanese sandfish and Korean flounder. Catchexperiments for Japanese sandfish using commercial vessels off the eastern coast of Korea were conductedwith six different mesh sizes between October and December 2007 and those for Korean flounder with fivedifferent mesh sizes between 2008 and 2009. The mesh size of 50% probability of catch corresponding tobiological maturity length of fish was not different between that by least square method and that by maximumlikelihood analysis for Japanese sandfish, however, a little different for Korean flounder, that is, those meshsizes of 50% probability of catch for biological maturity length of Korean flounder were 10.6cm and 10.1cmby least square method and maximum likelihood analysis, respectively.Keywords: Selectivity, Gill net, Kitaharas method, Least square method, Maximum likelihood analysis,Japanese sandfish, Korean flounder