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Seafloor habitat definition for spatial management in fisheries: A case study on the continental shelf of southeast Australia
Institution:1. Unidad de Arritmias, Hospital Universitario de Burgos, Burgos, España;2. Unidad de Arritmias, Hospital General Universitario de Alicante, Alicante, España;3. Unidad de Arritmias, Consorcio Hospital General Universitario de Valencia, Valencia, España;1. Department of Mechanical Engineering, University of Kansas, 1530 W 15th St., Learned Hall Room 3138, Lawrence, KS 66045, USA;2. Department of Neurosurgery, University of Kansas Medical Center, 3901 Rainbow Blvd, Kansas City, KS 66160, USA;3. Department of Orthopaedic Surgery, Children''s Mercy Hospital and Clinics of Kansas City, 2401 Gillham Rd, Kansas City, MO 64108, USA;4. Bioengineering Graduate Program, University of Kansas, 1450 Jayhawk Blvd, Lawrence, KS 66045, USA
Abstract:The importance of habitat to fisheries production on Australia's southeast continental shelf is part of a five-year study of ecosystem functioning and its implications for a sustainable fishery. Benthic habitats from 40 m to ~200 m were studied, based on identification of suitable sites from local fishers' information. Results presented here concentrate on data from a single mesohabitat at 40–60 m depth collected over two days. Macrohabitats within this mesohabitat were discriminated as soft, hard and rough from visual inspection of acoustic echograms. Subsequent analysis of the return echoes using roughness and hardness indices did not significantly improve real-time visual discriminations. Macrohabitats were sampled with an underwater video camera, sediment sampler, benthic sled, demersal trawl, gillnets and fish traps to relate the acoustic classifications to biological habitats. There were distinct differences in the benthic and fish communities between macrohabitats discriminated by acoustics. We concluded that discrimination of habitats from visual inspection of echograms, plus limited verification with physical sampling, could provide sufficient information for spatial management. However, successful management of individual species, the fish community and the ecosystem requires an understanding of the association of fishes with habitat at the macrohabitat and mesohabitat level, and its variability through time.
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