Visual characteristics of walleye pollock and Chinook salmon: Modeling theoretical visual space and target contrast of trawling materials in the Bering Sea
Walleye pollock (Gadus chalcogrammus) and Chinook salmon (Oncorhynchus tshawytscha) are economic and cultural resources in Alaska. Chinook salmon bycatch is a large concern within the pollock fishery. Current strategies to reduce salmon bycatch include modifying trawl gear by implementing artificial...
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ftwestwashington:oai:cedar.wwu.edu:wwuet-2290 2024-01-07T09:42:27+01:00 Visual characteristics of walleye pollock and Chinook salmon: Modeling theoretical visual space and target contrast of trawling materials in the Bering Sea Haehn, Rebecca 2023-01-01T08:00:00Z application/pdf https://cedar.wwu.edu/wwuet/1252 https://cedar.wwu.edu/context/wwuet/article/2290/viewcontent/Haehn_thesis_final_format_a.pdf English eng Western CEDAR https://cedar.wwu.edu/wwuet/1252 https://cedar.wwu.edu/context/wwuet/article/2290/viewcontent/Haehn_thesis_final_format_a.pdf Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission. WWU Graduate School Collection Alaska Chinook salmon walleye pollock fishing trawl vision Environmental Sciences text 2023 ftwestwashington 2023-12-10T17:44:29Z Walleye pollock (Gadus chalcogrammus) and Chinook salmon (Oncorhynchus tshawytscha) are economic and cultural resources in Alaska. Chinook salmon bycatch is a large concern within the pollock fishery. Current strategies to reduce salmon bycatch include modifying trawl gear by implementing artificial light near or on escapement panels to increase salmon escapement. The visual characteristics of pollock and Chinook salmon were investigated to understand the perception of trawl gear. The visual pigments of each species were measured using microspectrophotometry (MSP). Pollock were dichromats with spectral sensitivity ranging from 449nm–518 nm and Chinook salmon were trichromats with sensitivity ranging from 436 nm–545 nm. The green opsins within Chinook salmon will activate when stimulated by wavelengths that are outside of the spectral sensitivity of pollock. Microspectrophotometry data defining pollock and Chinook salmon visual pigments, spectral irradiance data from the Bering Sea, and spectral reflectance of commonly used trawl components were input into two visual models, VPModel® and the R package pavo. Visual models predict how the organism’s visual system responds to visual stimuli. Modeling the spectral distribution and physiological visual characteristics predicts how fish interact and adapt to the changing light environment. Spectral irradiance availability decreased with depth and increasing chlorophyll a concentration. Target contrast against the background space light was dependent on the light environment characteristics including depth. Using the physiological data and theoretical model output provides spectral range and intensity limitations to behavior experiments aiming to increase the escapement potential of Chinook salmon in the pollock fishery Text Bering Sea Alaska Western Washington University: CEDAR (Contributing to Education through Digital Access to Research) Bering Sea |
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Open Polar |
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Western Washington University: CEDAR (Contributing to Education through Digital Access to Research) |
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ftwestwashington |
language |
English |
topic |
Alaska Chinook salmon walleye pollock fishing trawl vision Environmental Sciences |
spellingShingle |
Alaska Chinook salmon walleye pollock fishing trawl vision Environmental Sciences Haehn, Rebecca Visual characteristics of walleye pollock and Chinook salmon: Modeling theoretical visual space and target contrast of trawling materials in the Bering Sea |
topic_facet |
Alaska Chinook salmon walleye pollock fishing trawl vision Environmental Sciences |
description |
Walleye pollock (Gadus chalcogrammus) and Chinook salmon (Oncorhynchus tshawytscha) are economic and cultural resources in Alaska. Chinook salmon bycatch is a large concern within the pollock fishery. Current strategies to reduce salmon bycatch include modifying trawl gear by implementing artificial light near or on escapement panels to increase salmon escapement. The visual characteristics of pollock and Chinook salmon were investigated to understand the perception of trawl gear. The visual pigments of each species were measured using microspectrophotometry (MSP). Pollock were dichromats with spectral sensitivity ranging from 449nm–518 nm and Chinook salmon were trichromats with sensitivity ranging from 436 nm–545 nm. The green opsins within Chinook salmon will activate when stimulated by wavelengths that are outside of the spectral sensitivity of pollock. Microspectrophotometry data defining pollock and Chinook salmon visual pigments, spectral irradiance data from the Bering Sea, and spectral reflectance of commonly used trawl components were input into two visual models, VPModel® and the R package pavo. Visual models predict how the organism’s visual system responds to visual stimuli. Modeling the spectral distribution and physiological visual characteristics predicts how fish interact and adapt to the changing light environment. Spectral irradiance availability decreased with depth and increasing chlorophyll a concentration. Target contrast against the background space light was dependent on the light environment characteristics including depth. Using the physiological data and theoretical model output provides spectral range and intensity limitations to behavior experiments aiming to increase the escapement potential of Chinook salmon in the pollock fishery |
format |
Text |
author |
Haehn, Rebecca |
author_facet |
Haehn, Rebecca |
author_sort |
Haehn, Rebecca |
title |
Visual characteristics of walleye pollock and Chinook salmon: Modeling theoretical visual space and target contrast of trawling materials in the Bering Sea |
title_short |
Visual characteristics of walleye pollock and Chinook salmon: Modeling theoretical visual space and target contrast of trawling materials in the Bering Sea |
title_full |
Visual characteristics of walleye pollock and Chinook salmon: Modeling theoretical visual space and target contrast of trawling materials in the Bering Sea |
title_fullStr |
Visual characteristics of walleye pollock and Chinook salmon: Modeling theoretical visual space and target contrast of trawling materials in the Bering Sea |
title_full_unstemmed |
Visual characteristics of walleye pollock and Chinook salmon: Modeling theoretical visual space and target contrast of trawling materials in the Bering Sea |
title_sort |
visual characteristics of walleye pollock and chinook salmon: modeling theoretical visual space and target contrast of trawling materials in the bering sea |
publisher |
Western CEDAR |
publishDate |
2023 |
url |
https://cedar.wwu.edu/wwuet/1252 https://cedar.wwu.edu/context/wwuet/article/2290/viewcontent/Haehn_thesis_final_format_a.pdf |
geographic |
Bering Sea |
geographic_facet |
Bering Sea |
genre |
Bering Sea Alaska |
genre_facet |
Bering Sea Alaska |
op_source |
WWU Graduate School Collection |
op_relation |
https://cedar.wwu.edu/wwuet/1252 https://cedar.wwu.edu/context/wwuet/article/2290/viewcontent/Haehn_thesis_final_format_a.pdf |
op_rights |
Copying of this document in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission. |
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