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Development and use of a novel main Hawaiian Islands bathymetric and backscatter synthesis in a stratified fishery-independent bottomfish survey.
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2019
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Description:The Hawaii deep-slope bottomfish fishery preferentially targets seven high value species (i.e. six snappers and one grouper, hereafter referred to as Deep7) and represents the major insular commercial fishery in the state. The NOAA Pacific Islands Fisheries Science Center (PIFSC) Stock Assessment Program (SAP) is responsible for regularly assessing this stock complex. To augment and improve the data used in the main Hawaiian Islands Deep7 Stock Assessment, PIFSC began developing a multi-gear Bottomfish Fishery-Independent Survey for the Deep7 in 2011. Benthic habitat has been shown to play a key role in determining the spatial distribution of demersal living marine resources. Accordingly, the BFISH survey employs a stratified random sampling design based on depth and habitat. Prior to the work presented here, full development of the BFISH survey was impeded by a lack of usable backscatter data across the entire MHI domain. Backscatter data had been collected throughout the MHI using various platforms and sensors, thus producing a data set that included numeric backscatter values representing different levels of substrate hardness in different areas. To remedy this situation, and to improve stratification of the BFISH survey, the NOAA Pacific Islands Fisheries Science Center collaborated with the University of Hawaii at Mānoa, to create a comprehensive, high-resolution, bathymetric and backscatter synthesis for the MHI. We describe this effort in two parts: 1. Part I: Developing the 5-m resolution bathymetric and backscatter synthesis covering the MHI at depths of 75 to 400 m; 2. Part II: Using these new products to refine and improve stratification for the NOAA PIFSC Bottomfish Fishery-independent Survey in Hawaii.
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