Department of Fisheries Oceanography/SMAST seminar - March 29, 2017 - Diego Bernal
When: Wednesday,
March 29, 2017
3:30 PM
-
4:30 PM
Where: Fairhaven Campus
Description: Department of Fisheries Oceanography
Stressed out sharks: What are the consequences of being captured?
Diego Bernal
Biology Department / UMD
Wednesday, March 29, 2017
3:30 pm - 4:30 pm
SMAST II, Room 157
200 Mill Road, Fairhaven, MA
ABSTRACT: Research on fishing-related stress indicates that the post-release survival of sharks captured with commercial longline (both pelagic and demersal) and purse seine, and with recreational gear may be impaired due to significant physiological disruptions related to the capture event. The magnitude of the stress response in sharks is both species-specific and gear-specific, but there is growing evidence that there is a direct correlation between time on the line (i.e., degree of struggle) and post-release mortality. Recent work using shark blood taken at the time of capture shows that the values for some ions and metabolites significantly change with time-on-the-line and are elevated when compared to values taken from relatively unstressed specimens during captive studies. There is increasing evidence that the level of several stress markers measured in the blood of sharks at the time of capture may be indicative of whole-animal physiological condition and may be used as predictors of post-release mortality. However, these relationships are complex and each shark species presents a unique suite of capture-related physiological stress response. For these reasons, there is a critical need for the assessment of species-specific physiological responses to capture stress with the aim of decreasing the impacts of any fishery interaction and aiding in more sustainable fisheries.
Note: Seminar will be simulcast to SMAST I, Room 204
You can view the seminar live by clicking here: 'live event'. or
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.
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
Stressed out sharks: What are the consequences of being captured?
Diego Bernal
Biology Department / UMD
Wednesday, March 29, 2017
3:30 pm - 4:30 pm
SMAST II, Room 157
200 Mill Road, Fairhaven, MA
ABSTRACT: Research on fishing-related stress indicates that the post-release survival of sharks captured with commercial longline (both pelagic and demersal) and purse seine, and with recreational gear may be impaired due to significant physiological disruptions related to the capture event. The magnitude of the stress response in sharks is both species-specific and gear-specific, but there is growing evidence that there is a direct correlation between time on the line (i.e., degree of struggle) and post-release mortality. Recent work using shark blood taken at the time of capture shows that the values for some ions and metabolites significantly change with time-on-the-line and are elevated when compared to values taken from relatively unstressed specimens during captive studies. There is increasing evidence that the level of several stress markers measured in the blood of sharks at the time of capture may be indicative of whole-animal physiological condition and may be used as predictors of post-release mortality. However, these relationships are complex and each shark species presents a unique suite of capture-related physiological stress response. For these reasons, there is a critical need for the assessment of species-specific physiological responses to capture stress with the aim of decreasing the impacts of any fishery interaction and aiding in more sustainable fisheries.
Note: Seminar will be simulcast to SMAST I, Room 204
You can view the seminar live by clicking here: 'live event'. or
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.
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