Mean weights at age in Celtic Sea Herrings

Stock recruitment analysis for Celtic sea herring suggest that exploitation rates of F >0.4 carry a high probability of long term SSB decline. Fmed, which would carry a much lower risk of reducing the SSB, has been suggested as a candidate for Fpa and most recent analyses give this value at 0.29. However based on last years assessment only 4 of the 41 estimated fishing mortalaties were equal or less than 0.3 while 26 were higher or equal to 0.4 with the series average being F=0.50. This would indicate that F>0.4 does not seem carry a high probability of stock collapse. Thus there is an apparent discrepancy between the analyses and experience.

URI

http://hdl.handle.net/10793/1439

Description

Discussion document for the HAWG 15/03/00

Citation

Kelly, C. J., & Molloy, J. (2000). Mean weights at age in Celtic Sea Herrings. Discussion Document for the Herring Assessment Working Group 15/03/00. Marine Institute