Stima del Rendimento Medio per Cala dei Trawl Surveys con Distribuzioni non Normali delle catture

The catch data from eight trawl surveys carried out in the Sicilian Channel, grouped into eight frequency distributions are subjected to the Kolmogorov-Smirnov test. When distribution is normal the usual theory is used to calculate average hauls and confidence limits. With non-normal distribution of hauls the same estimates are calculated using the 8 distribution.