The effects of windchill exposure on the snow crab, Chionoecetes opilio
Thesis (M.S.) University of Alaska Fairbanks, 2001 Millions of snow crabs, 'Chionoecetes opilio, ' are aerially exposed during sorting in the annual Bering Sea commercial fishery. A laboratory experiment measured snow crab responses to windchill exposure. Crabs were exposed to 8 to 16 m/s...
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2001
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ftunivalaska:oai:scholarworks.alaska.edu:11122/4965 2023-05-15T15:43:45+02:00 The effects of windchill exposure on the snow crab, Chionoecetes opilio Warrenchuk, Jonathan J. 2001-08 http://hdl.handle.net/11122/4965 en_US eng http://hdl.handle.net/11122/4965 Fisheries Division Thesis ms 2001 ftunivalaska 2023-02-23T21:36:20Z Thesis (M.S.) University of Alaska Fairbanks, 2001 Millions of snow crabs, 'Chionoecetes opilio, ' are aerially exposed during sorting in the annual Bering Sea commercial fishery. A laboratory experiment measured snow crab responses to windchill exposure. Crabs were exposed to 8 to 16 m/s windspeed and air temperatures from -2 to -10 C̊ for 5 minutes. Mortality, autonomy, and righting response were assessed for seven days post-treatment. Crabs experienced 40% to 100% mortality at windchill from -10 to 16 C̊. Reduced exposure time significantly reduced mortality. Autonomy was variable but pronounced below -10 C̊ windchill. The righting response was impaired after all but the least severe treatment. Estimates of mortality of discarded snow crab in 1998 were calculated from deadloss of retained crab, a windchill model, and a temperature/windspeed model. No relationship existed between catch deadloss and the windchill conditions when the crabs were caught. Mortality of non-retained snow crab was estimated at 3.6% by the windchill model and 19.6% by the temperature /windspeed model. Thesis Bering Sea Chionoecetes opilio Snow crab Alaska University of Alaska: ScholarWorks@UA Bering Sea Fairbanks |
institution |
Open Polar |
collection |
University of Alaska: ScholarWorks@UA |
op_collection_id |
ftunivalaska |
language |
English |
description |
Thesis (M.S.) University of Alaska Fairbanks, 2001 Millions of snow crabs, 'Chionoecetes opilio, ' are aerially exposed during sorting in the annual Bering Sea commercial fishery. A laboratory experiment measured snow crab responses to windchill exposure. Crabs were exposed to 8 to 16 m/s windspeed and air temperatures from -2 to -10 C̊ for 5 minutes. Mortality, autonomy, and righting response were assessed for seven days post-treatment. Crabs experienced 40% to 100% mortality at windchill from -10 to 16 C̊. Reduced exposure time significantly reduced mortality. Autonomy was variable but pronounced below -10 C̊ windchill. The righting response was impaired after all but the least severe treatment. Estimates of mortality of discarded snow crab in 1998 were calculated from deadloss of retained crab, a windchill model, and a temperature/windspeed model. No relationship existed between catch deadloss and the windchill conditions when the crabs were caught. Mortality of non-retained snow crab was estimated at 3.6% by the windchill model and 19.6% by the temperature /windspeed model. |
format |
Thesis |
author |
Warrenchuk, Jonathan J. |
spellingShingle |
Warrenchuk, Jonathan J. The effects of windchill exposure on the snow crab, Chionoecetes opilio |
author_facet |
Warrenchuk, Jonathan J. |
author_sort |
Warrenchuk, Jonathan J. |
title |
The effects of windchill exposure on the snow crab, Chionoecetes opilio |
title_short |
The effects of windchill exposure on the snow crab, Chionoecetes opilio |
title_full |
The effects of windchill exposure on the snow crab, Chionoecetes opilio |
title_fullStr |
The effects of windchill exposure on the snow crab, Chionoecetes opilio |
title_full_unstemmed |
The effects of windchill exposure on the snow crab, Chionoecetes opilio |
title_sort |
effects of windchill exposure on the snow crab, chionoecetes opilio |
publishDate |
2001 |
url |
http://hdl.handle.net/11122/4965 |
geographic |
Bering Sea Fairbanks |
geographic_facet |
Bering Sea Fairbanks |
genre |
Bering Sea Chionoecetes opilio Snow crab Alaska |
genre_facet |
Bering Sea Chionoecetes opilio Snow crab Alaska |
op_relation |
http://hdl.handle.net/11122/4965 Fisheries Division |
_version_ |
1766377951547359232 |