Ticket #1600 (closed assessed: not an issue)
MSY strange behaviour
| Reported by: | viliyc | Owned by: | |
|---|---|---|---|
| Priority: | normal | Milestone: | |
| Component: | MSY | Version: | 6.6 beta |
| Severity: | minor | Keywords: | |
| Cc: |
Description
I was checking the MSY calculations in Ecosim, and noticed some very strange behavior on the simple model I used for the purpose: Anchovy Bay (attached)
In the model Cod has an F of 0.15/year, but when running the MSY search the full compensation stops at 0.04 and crashes the cod. See screenshot. They then bounce briefly back at an F around 0.15 but crashes again. I’ve tried to make long-term (500 years) run in Ecosim where I gradually increase F from 0 to 0.15 and the model behaves absolutely reasonable in that case. The stationary fmsy is probably ok (around 0.09). I cannot figure out what is going on, but it is definitely not right. Worrisome as I have to run a bunch of models to get fmsy with short deadline.
Would you look into is, asap, please
Attachments
Change History
Changed 6 years ago by jeroens
- Attachment Anchovy Bay.EwEmdb.zip added
Changed 6 years ago by jeroens
- Attachment Screenshot 2018-09-03 15.23.19.png added
Example of the error
comment:1 Changed 6 years ago by jeroens
Chatted with Carl, he thought it was dynamic instability (which it indeed looked like) caused by foraging time adjustment. I couldn’t get it to show dynamic instability in Ecosim, but the problem disappeared when foraging time adjustment was set to 0 for all but marine mammals.
Model to reproduce the error