Remarks on natural mortality of Dissostichus eleginoides in Subarea 48.3

With samples originated in the Chilean longline fishery of Dissostichus eleginoides of subarea 48.3 (N=7848) after Sparre (1990) the natural mortality was calculated . The Von Bertalanffy parameters obtained independently by three authors were used and considering as variables: fishing site, fishing depth and hook type.
It was determined that there was no significative differences, in M value, in the considered cases with the different growing parameters, with the exception of the case of fishing sites. By other hand, when comparing the different mean values of M for the different variables , it was found that there were significative differences between fishing sites and curve hooks N° 14 and straight hooks N° 22.
The general mean value of M calculated for the 44 analyzed situations was 0.14 ± 0.03, being the range between 0.0623 - 0.2727.