1 / 13

MEDITERRANEAN SWORDFISH

MEDITERRANEAN SWORDFISH. SCI-020. Background. Unique genetic stock Some mixing with the N. Atlantic one Different biological characteristics than the Atlantic stocks Last assessment few weeks ago. Fishery. Catches around 12000-16000 t in the last decade.

mitchellbruce
Télécharger la présentation

MEDITERRANEAN SWORDFISH

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. MEDITERRANEAN SWORDFISH SCI-020

  2. Background • Unique genetic stock • Some mixing with the N. Atlantic one • Different biological characteristics than the Atlantic stocks • Last assessment few weeks ago.

  3. Fishery • Catches around 12000-16000 t in the last decade. • 14000 t in 2005. Incomplete information for 2006. • Gears: Longlines & Gillnets

  4. Catch composition • Large catches of juveniles (50-70%) SWO Figure 4 Proportion of catch numbers at age by year.

  5. Stock assessment } • Two assessment types • Production modelling (long data series) • Age based VPAs (short data series) Stock decline

  6. State of the stocks Current stock level about 13% lower than optimum Production modeling Current F about 25% higher than optimum 40% reduction in spawning stock level but modest changes in the last decade VPA Stable recruitment over the past 20 years. Current spawning stock level half than optimum Y/R Current F double than optimum

  7. Current (2005) stock status VPA median Prod. Mod. median

  8. Time trends VPA Production modeling

  9. Projections VPA Production modeling

  10. Assessment conclusions • The stock is below the level which can support MSY • Current fishing mortality exceeds FMSY. • The degree to which biomass is below BMSY and F is above FMSY differs between assessment models. • Fishing pressure needs to be reduced to move the stock towards to biomass levels which could support MSY and away from levels which could result in non-negligible risks of rapid stock decline; although such worrying signals have not been seen so far in the fisheries.

  11. Mediterranean Swordfish Summary

  12. Exploitation scenarios Fishery closures during recruitment

  13. Management recommendations • Adoption of a management plan with the goal of rebuilding the stock to levels that are consistent with the ICCAT Convention objective. • Technical measures, such as fishery closures and gear modifications, as well as capacity reductions should be considered in the frames of a management plan

More Related