Assessing bottom structure influence on fish abundance in a marine hill by using conjointly acoustic survey and geographic information system

Acoustic survey and a geographic information system (GIS) were used conjointly to estimate the significance of bottom substrate to explain fish abundance distribution in the complex topography context of a marine hill. The survey was conducted in the Hachirigase hill, off south-western Honshu Island...

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Bibliographic Details
Published in:Fisheries science 2008-06, Vol.74 (3), p.469-478
Main Authors: TANOUE, Hideaki, HAMANO, Akira, KOMATSU, Teruhisa, BOISNIER, Etienne
Format: Article
Language:English
Subjects:
acoustic survey
Acoustics
Biomedical and Life Sciences
bottom structure influence
Fish
Fish & Wildlife Biology & Management
fish abundance distribution
Food Science
Freshwater & Marine Ecology
Geographic information systems
GIS
Life Sciences
Marine
marine hill
Polls & surveys
Remote sensing
Substrates
Topography
Water depth
Water temperature
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Summary:Acoustic survey and a geographic information system (GIS) were used conjointly to estimate the significance of bottom substrate to explain fish abundance distribution in the complex topography context of a marine hill. The survey was conducted in the Hachirigase hill, off south-western Honshu Island in the Sea of Japan. Analysis of acoustic data focused on a 10-m thick layer beginning at the bottom, assuming that bottom influence does not exceed this distance. Area backscattering strength (Sa) values were rescaled in order to reflect real differences before being analyzed. Results show that the influence of the different parameters taken into account (bottom depth, bottom substrate and water temperature) varies widely from one place to another. Bottom substrate is above all important in the zone located to the west of the peak. The kriging and stratification methods were applied to the Sa distribution for estimating the total Sa in the hill. Differences between results are discussed. Conjoint use of acoustic survey and GIS is an effective method for analyzing and estimating fish abundance distribution in a marine hill.
ISSN:0919-9268
1444-2906
DOI:10.1111/j.1444-2906.2008.01548.x