How to allow starvation but ensure crabs don't molt if they haven't gained enough weight.

[cstawitz]

Added ability for crabs to endure starvation, but molt occurs on a set time scale even if weight gained is too small to support molting. How do we set a minimum threshold for molt timing?

[wStockhausen]

Aha! Avoiding the vacation notice!

One of the life stage parameters is "minimum stage duration" (so, time-in-stage) and another is "minimum size at metamorphosis" (or something similar). Either of these might work without modifying the code much at all. [You could interpret the latter, for example, as a minimum weight--rather than length or CW. However, this would mean defining life stages for each instar (not java classes, just LHS Types), which would be a bit of a pain given the number of benthic instars.]

A more straightforward, and easier, way would just be to require that molting only occurs if the weight gained is large enough to support it AND the minimum number of degree days has been experienced. Just involves keeping track of weight gained within a stage, as well as the number of degree days.

---

• Dr. William T. Stockhausen *

  ---

• Resource Ecology and Fisheries Management *
• Alaska Fisheries Science Center *
• National Marine Fisheries Service *
• National Oceanic and Atmospheric Administration *
• 7600 Sand Point Way N.E. *
• Seattle, Washington 98115-6349 *

  ---

• email: William.Stockhausen@noaa.gov *
• voice: 206-526-4241 fax: 206-526-6723 *
• web : http://www.afsc.noaa.gov *

  ---

  All models are wrong, some are useful.--G.E.P. Box Beware of geeks bearing equations. --W. Buffett

  ---

  Disclaimer: The opinions expressed above are personal and do not necessarily reflect official NOAA policy.

On Fri, Mar 23, 2018 at 2:44 PM, Christine Stawitz <notifications@github.com

wrote:

Added ability for crabs to endure starvation, but molt occurs on a set time scale even if weight gained is too small to support molting. How do we set a minimum threshold for molt timing?

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/wStockhausen/DisMELS_SnowCrab/issues/1, or mute the thread https://github.com/notifications/unsubscribe-auth/AFgB9OUIU-4tDw1rAWaZYceSCl270l1mks5thUJ0gaJpZM4S5NRo .

[cstawitz]

Yes, definitely don't want to have a separate life stage per instar.. Thanks! I swear I wasn't trying to contact you during your leave, just making a note for myself.. sorry!

On Sat, Mar 24, 2018 at 5:17 AM wStockhausen notifications@github.com wrote:

Aha! Avoiding the vacation notice!

One of the life stage parameters is "minimum stage duration" (so, time-in-stage) and another is "minimum size at metamorphosis" (or something similar). Either of these might work without modifying the code much at all. [You could interpret the latter, for example, as a minimum weight--rather than length or CW. However, this would mean defining life stages for each instar (not java classes, just LHS Types), which would be a bit of a pain given the number of benthic instars.]

A more straightforward, and easier, way would just be to require that molting only occurs if the weight gained is large enough to support it AND the minimum number of degree days has been experienced. Just involves keeping track of weight gained within a stage, as well as the number of degree days.

---

• Dr. William T. Stockhausen *

  ---

• Resource Ecology and Fisheries Management *
• Alaska Fisheries Science Center *
• National Marine Fisheries Service *
• National Oceanic and Atmospheric Administration *
• 7600 Sand Point Way N.E. <https://maps.google.com/?q=7600+Sand+Point+Way+N.E.+++++++++++++++++++++++++%0D%0A*+Seattle,+Washington+98115&entry=gmail&source=g>
• Seattle, Washington 98115 https://maps.google.com/?q=7600+Sand+Point+Way+N.E.++++++++++++++++++++++++*+%0D%0A*+Seattle,+Washington+98115&entry=gmail&source=g-6349

• ---

• email: William.Stockhausen@noaa.gov *
• voice: 206-526-4241 <(206)%20526-4241> fax: 206-526-6723 <(206)%20526-6723> *
• web : http://www.afsc.noaa.gov *

  ---

  All models are wrong, some are useful.--G.E.P. Box Beware of geeks bearing equations. --W. Buffett

  ---

  Disclaimer: The opinions expressed above are personal and do not necessarily reflect official NOAA policy.

On Fri, Mar 23, 2018 at 2:44 PM, Christine Stawitz < notifications@github.com

wrote:

Added ability for crabs to endure starvation, but molt occurs on a set time scale even if weight gained is too small to support molting. How do we set a minimum threshold for molt timing?

— You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub https://github.com/wStockhausen/DisMELS_SnowCrab/issues/1, or mute the thread < https://github.com/notifications/unsubscribe-auth/AFgB9OUIU-4tDw1rAWaZYceSCl270l1mks5thUJ0gaJpZM4S5NRo

.

— You are receiving this because you were assigned. Reply to this email directly, view it on GitHub https://github.com/wStockhausen/DisMELS_SnowCrab/issues/1#issuecomment-375882290, or mute the thread https://github.com/notifications/unsubscribe-auth/AGzWJlmrwyV-VOKWTrYSTHY0ldD6xSQJks5thjkagaJpZM4S5NRo .