An example of harvest rule control for recovery the jack mackerel population
Sponsored Links
This presentation is the property of its rightful owner.
1 / 15

An example of harvest rule control for recovery the jack mackerel population PowerPoint PPT Presentation

  • Uploaded on
  • Presentation posted in: General

An example of harvest rule control for recovery the jack mackerel population. Cristian Canales- IFOP- Chile. Main questions. What we want to do with jack mackerel (JM) population ? What is the status of JM population ? Why and how rebuild the JM population ?.

Download Presentation

An example of harvest rule control for recovery the jack mackerel population

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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.

- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript

Anexample of harvest rule control forrecoverythejackmackerelpopulation

Cristian Canales- IFOP- Chile


  • Whatwewantto do withjackmackerel (JM) population?

  • Whatisthe status of JM population?

  • Why and howrebuildthe JM population?

Whatwewantto do with JM population?

  • Wesupposethere’sanimplicitdesire, thatistheconservation. Whatdoesconservation mean?

  • Thesustainableexploitation: allcountrieswantto be at thebussinessforlong time.

  • Ideally, wewanttogetthemaximumyield and maintainitover time (MSY). Howthereachit?

“Believeornotbelieve in MSY”

  • Why in fishery management is considered a biomass escapement level?.

  • When we accept the existence of S-R relationship (no parents -> no recruits), we are accepting the existence of MSY implicitly.

Whatisthe status of JM population?

  • A general target of many fishery resources is to maintain the population and its fishery around MSY (Bmsy and Fmsy).

  • In this sense, the pair (Bmsy; Fmsy) defines the Biological Reference Points - BRP (or any quantity close to these). When we cannot estimate the MSY variables properly, we can adopt a proxy (~40%Bo)

  • We have talked about about this. See Canales C.(SWG-11-JM-01, 2012), Canales & Hintzen (SWG-11-JM-09, 2012)


Whatisthe status of JM population?

(Cooper, 2006)

Estimatingthe MSY in JM


Whatisthe status of JM population?



HereFmsyisappliedindependently of population status

2)Rampstrategy(F = Fmsy * SSB/SSBo),

Here the Fmsy is reduced as a proportion of population depletion when the overfished have been declared

The target isreachedafter 8 years

It is necessary more than 10 yrs to reach the target

Ramp strategy: The cost are lower catches at the beginning , but in the future, landings will be larger.

If the recruitment doesn’t back to historical level, the MSY won’t be reached never.

If a regime shift is going on, the BRP should be re-evaluated


1.To recovery the population, it is necessary to declare the condition as overfished

2.To declare the overfished condition, it is necessary define BRP (target and/or limit)

3. The population recovery may be reached, considering the variables related to MSY (or proxy) as biological reference points (BRP)

4.Considering the uncertainty of the future recruitments, a harvest rule control should be defined in order to sure the population’s rebuild.

  • Login