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Stock synthesis example models for users
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Length-to-Length structure dynamics SS3 #36

Open MauroMardones opened 3 weeks ago

MauroMardones commented 3 weeks ago

I'm wondering if SS3 have examples of size- structured models like those reviewed by Punt et al. (2013). Is it possible to condition SS3 to model dynamics based on length rather than age? I am working with fisheries that hard to age and this issue was a point raised in a peer review.

Thank you in advance.

Rick-Methot-NOAA commented 3 weeks ago

The dynamics of recruitment growth and mortality are all age based. The age specific rates of fishing mortality can be linked to length specific selectivity. If growth platoons are invoked, then each platoon can have different age specific F due to interaction of length selectivity with their different size at age. Rick

On Wed, Aug 28, 2024 at 12:57 PM MauroMardones @.***> wrote:

I'm wondering if SS3 have examples of size- structured models like those reviewed by Punt et al. (2013) https://doi.org/10.1093/icesjms/fss185. Is it possible to condition SS3 to model dynamics based on length rather than age? I am working with fisheries that hard to age and this issue was a point raised in a peer review.

Thank you in advance.

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MauroMardones commented 2 weeks ago

Thanks Richard.

So, it is vital for my question to consider how fishing mortality does not vary with age, but with length and platoons. This will allow to adjust the length selectivity. Now, how to define the number of platoons is what I must configure.