Two previously recorded species, Raja georgiana and Bathyraja meridionalis were recorded as-bycatch on one vessel in the South Georgia toothfish fishery, 2000. One further species could not be identified and was referred to as R. species 1. R. georgiana occurred in shallow water, the other two in deep water. The average catch rate was 0.23 rajids/1000 hooks. Distribution and length at maturity is described, as is the results of initial investigations of age determination using both vertebrae and thorns.
There is no abstract available for this document.
There is no abstract available for this document.
There is no abstract available for this document.
There is no abstract available for this document.
There is no abstract available for this document.
There is no abstract available for this document.
Abstract:
Estimates of natural mortality are currently unavailable for Patagonian toothfish. Such estimates are needed for estimating recruitments and for use in assessing yield. This paper proposes a method for jointly estimating natural mortality and cohort strength at age 4 using a negative log-likelihood function based on one or more cohorts for which their abundance has been estimated in two or more years. A worked example is provided in an appendix.
