Fwd: [Fisheries Think Tank] Save the Date: Online only! Kristin Privitera-Johnson on 5/2 at 2 PM PST

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Marta Rufino

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Apr 26, 2023, 4:58:02 AM4/26/23

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Kristin Privitera-Johnson: MS, Graduate student, School of Aquatic and Fishery Sciences, University of Washington

Title: Methods for improving catch stability: featuring phase-in provisions for large changes in catch limit recommendations

Date and Time: 5/2/2023 from 2 PM - 3:30 PM PST

GoToMeeting link: https://attendee.gotowebinar.com/register/1443105044115683163

Description:

The status of a stock can change when a new stock assessment includes new data, different values for pre-specified parameters, or different model assumptions. At present within the US, changes in annual catch limits given changes in assessments (and hence overfishing limits and acceptable biological catches) may be implemented immediately at the start of the next management period. However, two provisions added during recent revisions to the National Standard 1 guidelines may provide opportunities to specify catch limits to produce more stable harvests over time. The provisions allow Councils to develop flexible harvest control rules that a) phase-in changes to the acceptable biological catch over a time window, not to exceed three years, and b) include contingencies for carrying-over some of the unused portion of an annual catch limit (i.e., an underage) from one year to increase the acceptable biological catch for the next year. This project will use management strategy evaluation to investigate to what extent management strategies can minimize interannual variation in catch when new stock assessments result in a large increase or decrease in catch recommendations. Specifically, I will investigate the performance of harvest control rules that phase in new catch limits over time (see Wiedenmann and Holland [2020] for carryover!) and use constraints on catch limits or fishing mortality rate. The objective will be to explore the consequences of assessment model misspecification due to assumptions used for natural mortality, stock-recruit steepness, catch history, and selectivity form when a new assessment is conducted for long- and short-lived stocks.

Spring 2023 UW SAFS Fisheries Think Tank Schedule

Recordings, when applicable.