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| Abstract Submission No. | ABS-2022-06-0301 |
| Title of Abstract | Observed dead zone in the western Bay of Bengal continental margin and its impact in the functional diversity and distribution of demersal fishes |
| Authors | Hashim Manjebrayakath*, Aneesh Kumar K. V, Smitha B. R. |
| Organisation | Centre for Marine Living Resources and Ecology |
| Address | Centre for Marine Living Resources & Ecology (CMLRE) Kochi, Kerala, India Pincode: 682608 Mobile: 9495218512 E-mail: hashim@cmlre.gov.in |
| Country | India |
| Presentation | Oral |
| Abstract | Hypoxia effect the life near the bottom directly or indirectly on population structure, community composition, and ecosystem functioning. This may result in mortality and emigration of the organism from the region resulting dead zones. These ⿿dead zone⿿ occurs where oxygen depletion outpaces its replenishment or generation for which the key regulatory factors are stratification, residence time and vertical/horizontal mixing. Oxygen depletion in the oceanic waters impact the functional diversity, some species will adapt to hypoxic conditions and others will meet their energy requirements through anaerobic metabolism for a short period or try to migrate to oxygenated waters. In this context, the present study reports the occurrence of dead zone in the north western Bay of Bengal (300-500m depth contour along 15-18°N latitude) with nil fish catch in multiple bottom trawl operations, apart from some dead shells. The occurrence of the dead zone is seasonal indicating the influence of the natural or anthropogenically induced climatic variabilities even in the demersal/bottom dwelling organisms. The present work intends to discuss the drivers and implications of dead zones in the Indian waters based on the in-situ trawl based demersal fishery data sets collected onboard the FORV Sagar Sampada. |