Assessing bottom structure influence on fish abundance in a marine hill by using conjointly acoustic survey and geographic information system
Version of Record online: 2 JUN 2008
© 2008 Japanese Society of Fisheries Science
Volume 74, Issue 3, pages 469–478, June 2008
How to Cite
TANOUE, H., HAMANO, A., KOMATSU, T. and BOISNIER, E. (2008), Assessing bottom structure influence on fish abundance in a marine hill by using conjointly acoustic survey and geographic information system. Fisheries Science, 74: 469–478. doi: 10.1111/j.1444-2906.2008.01548.x
- Issue online: 2 JUN 2008
- Version of Record online: 2 JUN 2008
- Received 13 April 2007. Accepted 11 December 2007.
- acoustic survey;
- bottom structure influence;
- fish abundance distribution;
- marine hill
ABSTRACT: 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.