The model fitted reasonably well to the data. A summary of the results of the assessments is presented in Table 2.6.1a and Figure 2.6.1a.
The results from the assessment indicate that the current biomass of Sardinella
spp. is 24 percent above B0.1
. The relationship between the current fishing mortality at F0.1
is 56 percent, and the fishing mortality is lower than the fishing mortality coefficient that will provide a sustainable yield in the long term. Table 2.6.2
: Summary of the results for the Sardinella
in the northern stock
|Stock/abundance index ||Bcur/B0.1 ||Fcur/FSYcur ||Fcur/FMSY ||Fcur/F0.1 |
|Sardinella spp. (North/CPUE Liberia Industrial) ||124% ||79% ||50% ||56% |
: Relationship between the estimated biomass for the last year and the corresponding biomass at F0.1
: Relationship between the fishing mortality coefficient observed over the last year of the series and the coefficient that would provide a sustainable yield at the current biomass level.
: Relationship between the fishing mortality coefficient observed over the last year of the series and the coefficient that would provide a sustainable yield over the long term.
: Relationship between the fishing mortality coefficient observed over the last year of the series F0.1
Although the model shows that the stock is not fully exploited, knowledge on the fisheries from the region reveals that Sardinella
spp. is fully exploited. As a precautionary measure the catch should not exceed the last year catch of the series. The main limitation to the assessment is non-availability of time series data in the region. Time series data from surveys still remain a problem, but recent survey data in 2008 and 2009 are available for Sierra Leone (not present in the Working Group meeting in 2009). Additionally, Sierra Leone has a very short catch and effort data time series (2002–2007).