We revised stock status assessments of D. eleginoides in SSRUs C and D using comparative CPUE, modified Lincoln-Petersen and CASAL models following advices during the last WG-SAM meeting. Detailed results using CASAL models in SSRU C are described in a separated document.
The catch and tagging data in SSRU D were not enough to be applied to modified Lincoln-Petersen and CASAL models. Thus the stock sizes of D. eleginoides in SSRU D is estimated only by using CPUE comparison with the stock size estimates in SSRU C obtained from each method.
The estimated stock size in SSRU C from CPUE comparison (548 tonnes) was similar to that (542 tonnes) from modified Lincoln-Petersen. However, the stock size estimated from CASAL base model (1040 tonnes) was about 2 times higher than those from the two methods.
Since we have not obtained enough evidence to estimate plausible stock size, and accordingly have not been able to determine catch limit yet, we would like to conduct research repeated for at least one more year in the same locations as in the 2012/13 season, with the same survey design and sample size of a total of 50 tonnes in SSRUs C and D for the 2013/14 as in the 2012/13, thereafter, the phase of the survey will be moved from effort limited to catch limited.