Summary of Abstract Submission

Abstract Submission No. IO50-09-0064PresentationPoster

HILSA SHAD, TENUALOSA ILISHA (CLUPEIFORMES, CLUPEIDAE) HABITAT MODELING IN THE NORTHERN BAY OF BENGAL

M. Shahadat Hossain*1, S.M. Sharifuzzaman1, Sayedur Rahman Chowdhury1, Subrata Sarker2

1 Institute of Marine Sciences & Fisheries, Chittagong University, Bangladesh
2 Alfred Wegener Institute for Polar and Marine Research, Germany

ABSTRACT :

Geo-spatial modeling of fish habitat is used to support a wide range of a management needs involving with in-situ conservation. Preset study was carried out to develop habitat suitability modeling of anadromous Hilsa shad (Tenualosa ilisha) using GIS-based multi-criteria evaluation of hydro-meteorological parameters for egg, fry, juvenile, adult and brood. Landsat imagery and thematic layers were analyzed with ENVI and GIS, and developed a series of GIS models to identify and ranking of suitable areas for Hilsa habitat. Thus, 29,484km2 area of the northern Bay of Bengal including rivers, tributaries and channels of Bangladesh covers the study area. The overall evaluation shows that 29% of the water body (=8,674km2) consisting of the rivers of Meghna, Shahbajpur, Tetulia and Ander Manik as well as Sandwip, Kutubdia and Moheshkhali channels is most suitable for Hilsa habitat. Whereas, 27% (= 7,863km2) area including upstream riverine ecosystem and the near shore shallow regions are moderately suitable, and in particular, the offshore higher depth zones occupying 44% (=12,946km2) area is least suitable. The model outputs were verified after field data of fishers┐ indigenous knowledge with an accuracy level of 92%. This study attempts to translate science-based habitat modeling for life stage-specific conservation and management of Hilsa as well as to enhance recruitment success that will eventually improve fish populations in the northern Bay of Bengal and adjacent rivers.