Fisheries Infosite



Link to file
68_PAU7_09.pdf (696.2 kb)

A Bayesian length-based stock assessment model was applied to PAU 7 to estimate stock status and yield. 1985–87 was chosen as a reference period, because the model suggests that in these years biomass had stabilised following a ‘fishing down’ period that started in the 1970s, and the exploitation rate was moderate compared to later years. 

The assessment shows a depleted stock. The current spawning and recruited biomass levels are both much lower than they were when the catch data begin in 1974 or CPUE data begin in 1983. Both are lower than the agreed reference levels from 1985–87: spawning biomass has a median of 93%, with 5–95% range of 79–114%; recruited biomass has a median of 54% (46 65%). Both medians are below the agreed limit biomass reference points. Current exploitation (poorly determined because it depends on the assumed value for Umax ) is estimated to be 37% (33 42%).

Under the base case the model predicts that the stock may reach the reference level within 3 years.

Assessment results suggest that the current catch level is sustainable and the stock is likely to increase over three years. The list of cautions discussed above under “other factors” should be read in conjunction with this statement. Potential problems with the model are likely to cause model results to be optimistic.

Document date
Sunday, 31 May 2009
Document type
V 1.3
File format
Adobe PDF
File size
696.2 kb
Reference number
Sort order

Uploaded from
M:\SCIPOL\Working Groups 2009\Plenary 2009\FINAL\MFish 2009 May Plenary\May 2009 - PDF\68_PAU7_09.pdf

Uploaded date
Thursday, 11 June 2009

Search tags
Species: PAU;
Stock: PAU7;

If you are having problems opening this file, you may not have the software on your computer needed to view it. Click the link below to download and install a suitable program.