Department of Fisheries Oceanography/SMAST seminar - January 25, 2017 - Vanessa Trijoulet
When: Wednesday,
January 25, 2017
3:30 PM
-
4:30 PM
Where: Fairhaven Campus
Description: Bioeconomic modelling of grey seal predation impacts on the West of Scotland fisheries
Vanessa Trijoulet
Northeast Fisheries Science Center
Wednesday, January 25, 2016
3:30 pm - 4:30 pm
SMAST II, Room 157
200 Mill Road, Fairhaven, MA
Note: Seminar will be simulcast to SMAST I, Room 204
You can view the seminar live at https://echosystem.umassd.edu:8443/ess/portal/section/639b0a8e-baf5-49a4-93c3-8f1831f13692
Please note: the earliest you will be able to log in is
15 minutes before the regularly scheduled time.
Abstract:
Cod (Gadus morhua) are preyed upon by grey seals (Halichoerus grypus), and there is debate over the impact this has had on the decline of stocks and their prospects for recovery. We analysed a depleted stock to the West of Scotland and show that seal predation rate is consistent with a type II functional response. Forward projections of a model including the functional response under varying levels of fishing and seal population size suggest that stock recovery is possible under current conditions, but there is a modest probability that the stock will decline further in both the short and long term. The potential recovery is fragile and sensitive to relatively small increases in either fishing or seal predation. Forward projection models that exclude the functional response estimate a lower probability of stock decline and may underestimate the risk to the stock. At low stock sizes and high fishing mortality rates, functional response models project slower recovery but the opposite is true at low fishing mortality.
To view a video of an SMAST seminar (post-October 1, 2014), go to http://www.umassd.edu/smast/newsandevents/seminarseries/ and click on a highlighted title.
for more information, please contact cfox@umassd.edu
Vanessa Trijoulet
Northeast Fisheries Science Center
Wednesday, January 25, 2016
3:30 pm - 4:30 pm
SMAST II, Room 157
200 Mill Road, Fairhaven, MA
Note: Seminar will be simulcast to SMAST I, Room 204
You can view the seminar live at https://echosystem.umassd.edu:8443/ess/portal/section/639b0a8e-baf5-49a4-93c3-8f1831f13692
Please note: the earliest you will be able to log in is
15 minutes before the regularly scheduled time.
Abstract:
Cod (Gadus morhua) are preyed upon by grey seals (Halichoerus grypus), and there is debate over the impact this has had on the decline of stocks and their prospects for recovery. We analysed a depleted stock to the West of Scotland and show that seal predation rate is consistent with a type II functional response. Forward projections of a model including the functional response under varying levels of fishing and seal population size suggest that stock recovery is possible under current conditions, but there is a modest probability that the stock will decline further in both the short and long term. The potential recovery is fragile and sensitive to relatively small increases in either fishing or seal predation. Forward projection models that exclude the functional response estimate a lower probability of stock decline and may underestimate the risk to the stock. At low stock sizes and high fishing mortality rates, functional response models project slower recovery but the opposite is true at low fishing mortality.
To view a video of an SMAST seminar (post-October 1, 2014), go to http://www.umassd.edu/smast/newsandevents/seminarseries/ and click on a highlighted title.
for more information, please contact cfox@umassd.edu
Contact: > See Description for contact information
Topical Areas: School for Marine Sciences and Technology, SMAST Seminar Series