We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Trophic-level modelling of the coastal waters of the northern Bay of Bengal, West Bengal, India.
- Authors
Das, Isha; Hazra, Sugata; Das, Sourav; Giri, Sandip; Chanda, Abhra; Maity, Sourav; Ghosh, Shubhadeep
- Abstract
An ecosystem model was constructed for the northern Bay of Bengal (nBoB) using Ecopath (version 6.4.4). The model covered an area of 18,500 km2. There were 32 functional groups in the model including the non-living group, detritus. Trophic levels (TLs) for individual groups ranged from 1.0 to 4.22. Ecotrophic efficiency for most of the small pelagic fishes was found to be greater than 0.7. For hilsa it was 0.853, indicating high exploitation of this fish within the system. The nBoB was estimated to be a low ascendancy area (~ 19.2%) with a system overhead of 80.8%, which indicates system stability and a certain maturity. The total system throughput and the total primary production/total respiration estimated for the study area indicate that nBoB is a maturing ecosystem. The mean TL of the catch for the study area was 3.115. The results indicate that the nBoB system is still in a developing stage. The low mean TL of the catch indicates fishing practices targeting fish of lower TLs in the system. In the long run, this may cause fishing down the food web, which will eventually lead to declining catches. These results indicate that present fishing practices are unsustainable for the nBoB ecosystem.
- Subjects
TERRITORIAL waters; PELAGIC fishes; FISHING; RASTRELLIGER kanagurta; FISHERY management
- Publication
Fisheries Science, 2018, Vol 84, Issue 6, p995
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1007/s12562-018-1246-x