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Assuming 100% discard mortality

Laura Lee, modified 2 Years ago.

Assuming 100% discard mortality

Youngling Posts: 95 Join Date: 3/31/16 Recent Posts

Hello all!

In my model, all the discards I have entered are dead discards and used discard option = 2 in the Selectivity and Discard section in the control file, which does not require additional discard mortality parameters as all discarded fish are assumed dead with this option. Also, this option reads four retention parameters (logistic). I would like to explore dome-shaped retention (discard option = 4) and this option requires four discard mortality parameters. At what values should I set these parameters to assume 100% discard mortality?

Thanks in advance!

Cheers,

Laura

CW
Chantel Wetzel, modified 2 Years ago.

RE: Assuming 100% discard mortality

Youngling Posts: 32 Join Date: 10/7/15 Recent Posts

Hi Laura,

Setting discard mortality to 100% can be done by adjusting the  3rd discard mortality parameter (DiscMort_L_level_old_fleet) to 1.0.  You should be able to confirm this by looking at the selection, retention, mortality figure from r4ss.  

 

Chantel

 

Laura Lee, modified 2 Years ago.

RE: Assuming 100% discard mortality

Youngling Posts: 95 Join Date: 3/31/16 Recent Posts

Thanks so much, Chantel!