[FLR-list] age and length structured simulation models using FLR

[Iago Mosqueira]

Hi.

I cannot recall anybody doing it. If I understand correctly you want
both age and length dimensions. You could as you say use unit for this,
or, as we once planned for salmon, use a more complex naming convention
in the first 'quant' dimension that mixes both dimensions, e.g. 1_50,
1_55, 1_60, 2_50, ... Anyway, the main issue is that most methods work
on ages, so you would have to check at every step and probably rewrite
some code, or at least write some to neatly collapse by age or length

Best regards,


Iago

On 09/10/2012 12:17 PM, Sarah Kraak wrote:
>
> Dear FLR user,
>
> I plan to develop a simulation model that is partly
> age-length-structured. For projecting the cohorts forward through time
> I would collapse the age-length structure to age structure, but for
> e.g. simulating the effect of alternative gear I would switch to
> length-by-age structure within the time step. Is there anybody who has
> experience with this? I tried to avoid reinventing the wheel if
> someone else already has. I haven't worked with FLR for ages (not
> since 2008), so at the moment I'm probably pretty ignorant. I was
> thinking of using the dimension "unit" within the FLQuant for the
> length-disaggregated data. Does that make sense? If this is stupid,
> please let me know.
>
> Kind regards, and thanks a lot in advance,
>
> Sarah
>
> *Sarah B. M. Kraak, PhD**
> **Senior Postdoctoral Fisheries Researcher**
> **UniversityCollegeCork
> Based at:**
> **Marine Institute**
> **Rinville**
> **Oranmore**
> **Co. **Galway
> Ireland
> **phone +353 (0)91 387392**
> **fax +353 (0)91 387201**
> **email **sarah.kraak at marine.ie* <mailto:sarah.kraak at marine.ie>
> Did you know that salmon will have a troubled (social) life if their
> mother was stressed during the production of the eggs from which they
> originate? (/J. Fish Biol./79, 575-586). I find this terribly sad...
>
>
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-- 
Dr Iago Mosqueira

European Commission – Joint Research Center
Institute for the Protection and Security of the Citizen (IPSC)
Maritime Affairs Unit FISHREG – Scientific Support to Fisheries
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I-21027 Ispra (VA), Italy

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