Assessing rockfish abundance in complex habitats using acoustics and cameras
Many species of rockfishes (Sebastes spp.) are difficult to assess using trawl surveys due to their propensity to aggregate near the seafloor in rocky high relief areas. A feasibility study was conducted during October 2009 in such an area south of Kodiak Island, AK, to evaluate the use of standard...
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Online Access: | https://scholars.unh.edu/ccom/646 https://doi.org/10.1121/1.3589032 |
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ftuninhampshire:oai:scholars.unh.edu:ccom-1646 2023-05-15T17:04:42+02:00 Assessing rockfish abundance in complex habitats using acoustics and cameras Jones, Darin Weber, Thomas C. Rooper, Chris Butler, John L Wilson, Christopher D de Robertis, Alex 2011-01-01T08:00:00Z https://scholars.unh.edu/ccom/646 https://doi.org/10.1121/1.3589032 unknown University of New Hampshire Scholars' Repository https://scholars.unh.edu/ccom/646 http://dx.doi.org/10.1121/1.3589032 Center for Coastal and Ocean Mapping Oceanography and Atmospheric Sciences and Meteorology text 2011 ftuninhampshire https://doi.org/10.1121/1.3589032 2023-01-30T21:32:58Z Many species of rockfishes (Sebastes spp.) are difficult to assess using trawl surveys due to their propensity to aggregate near the seafloor in rocky high relief areas. A feasibility study was conducted during October 2009 in such an area south of Kodiak Island, AK, to evaluate the use of standard fisheries acoustic survey methods in conjunction with stereo‐video cameras for estimating the distribution and abundance of dusky and northern rockfishes. Uniformly spaced parallel transects were repeatedly surveyed using single beam echosounders over several days. A multibeam echosounder was used to characterize the seafloor as trawlable or untrawlable and these designations were corroborated by camera. Rockfish abundance was estimated using a combination of acoustic and camerameasurements. At least 80% of the rockfish detections were observed in untrawlable habitat areas, and within 2.0 m of the seafloor. Over half of the rockfish seen by the camera were within the acoustic dead zone. Repeat passes exhibited high precision and there was no significant difference in fish abundance or height off bottom between night and day. Future work is planned during summer 2011 to evaluate the feasibility of using these methods in broader areas and for other rockfishes in the Gulf of Alaska. Text Kodiak Alaska University of New Hampshire: Scholars Repository Gulf of Alaska The Journal of the Acoustical Society of America 129 4 2693 2693 |
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Open Polar |
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University of New Hampshire: Scholars Repository |
op_collection_id |
ftuninhampshire |
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unknown |
topic |
Oceanography and Atmospheric Sciences and Meteorology |
spellingShingle |
Oceanography and Atmospheric Sciences and Meteorology Jones, Darin Weber, Thomas C. Rooper, Chris Butler, John L Wilson, Christopher D de Robertis, Alex Assessing rockfish abundance in complex habitats using acoustics and cameras |
topic_facet |
Oceanography and Atmospheric Sciences and Meteorology |
description |
Many species of rockfishes (Sebastes spp.) are difficult to assess using trawl surveys due to their propensity to aggregate near the seafloor in rocky high relief areas. A feasibility study was conducted during October 2009 in such an area south of Kodiak Island, AK, to evaluate the use of standard fisheries acoustic survey methods in conjunction with stereo‐video cameras for estimating the distribution and abundance of dusky and northern rockfishes. Uniformly spaced parallel transects were repeatedly surveyed using single beam echosounders over several days. A multibeam echosounder was used to characterize the seafloor as trawlable or untrawlable and these designations were corroborated by camera. Rockfish abundance was estimated using a combination of acoustic and camerameasurements. At least 80% of the rockfish detections were observed in untrawlable habitat areas, and within 2.0 m of the seafloor. Over half of the rockfish seen by the camera were within the acoustic dead zone. Repeat passes exhibited high precision and there was no significant difference in fish abundance or height off bottom between night and day. Future work is planned during summer 2011 to evaluate the feasibility of using these methods in broader areas and for other rockfishes in the Gulf of Alaska. |
format |
Text |
author |
Jones, Darin Weber, Thomas C. Rooper, Chris Butler, John L Wilson, Christopher D de Robertis, Alex |
author_facet |
Jones, Darin Weber, Thomas C. Rooper, Chris Butler, John L Wilson, Christopher D de Robertis, Alex |
author_sort |
Jones, Darin |
title |
Assessing rockfish abundance in complex habitats using acoustics and cameras |
title_short |
Assessing rockfish abundance in complex habitats using acoustics and cameras |
title_full |
Assessing rockfish abundance in complex habitats using acoustics and cameras |
title_fullStr |
Assessing rockfish abundance in complex habitats using acoustics and cameras |
title_full_unstemmed |
Assessing rockfish abundance in complex habitats using acoustics and cameras |
title_sort |
assessing rockfish abundance in complex habitats using acoustics and cameras |
publisher |
University of New Hampshire Scholars' Repository |
publishDate |
2011 |
url |
https://scholars.unh.edu/ccom/646 https://doi.org/10.1121/1.3589032 |
geographic |
Gulf of Alaska |
geographic_facet |
Gulf of Alaska |
genre |
Kodiak Alaska |
genre_facet |
Kodiak Alaska |
op_source |
Center for Coastal and Ocean Mapping |
op_relation |
https://scholars.unh.edu/ccom/646 http://dx.doi.org/10.1121/1.3589032 |
op_doi |
https://doi.org/10.1121/1.3589032 |
container_title |
The Journal of the Acoustical Society of America |
container_volume |
129 |
container_issue |
4 |
container_start_page |
2693 |
op_container_end_page |
2693 |
_version_ |
1766059015318536192 |