A Consideration on the Density Index of Fish Population

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  • 魚の棲息密度指数についての考察
  • サカナ ノ セイソク ミツド シスウ ニ ツイテ ノ コウサツ

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Abstract

For estimating the density of fish population, catch per unit of effort is commonly used. But in order to allow such a method, distribution pattern of fish should be researched.<br> In a fishing ground, distribution of individuals and schools would be not random but contagious distribution. Frequency distribution of catch of many species is represented well by PÓLYA-EGGENBERGER type. And by transformation<br> x'=k-1/2sinh-1(kx)1/2<br> where k is constant, the standard deviation approaches a constant without regard to the mean. By this method, we can compare the groups with each other or examine the correlation of them.<br> In this examination, catch of th ?? demarsal fish in the East China and the Yellow Seas was used.

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