Mapping coastal lagoon characteristics for the aquaculture suitability using multi-criteria decision support (MCDS) spatial analysis - A case study from South-East Coast of India,

Abstract

A large extent of brackishwater resources is yet to be used for aquaculture as the present development stands at only 13% in India. But, growing environmental concerns and crop failures have made site selection a mandatory requirement for cage aquaculture. The case study carried out at Muttukadu Lagoon, India, has used thirteen factors to assess cage site suitability, including physical characteristics and environmental conditions. Spatial analysis has integrated the most influencing variables such as depth, turbidity, salinity, temperature, dissolved oxygen, pH, and total ammonia nitrogen using suitability scores and its comparative rank. pH, salinity, temperature, and TAN were in the acceptable range throughout the year. Concerning depth, turbidity, and dissolved oxygen, 12 to 52 %, 30 to 91 %, and 84 to 91 % of the lagoon were found to be suitable at different seasons. Overall, 11 % of the lagoon region was found to be fit for cage aquaculture. Water depth was the major limiting factor in cage site selection. From the study, crucial management measures are outlined for successful fish culture and maintain the lagoon's health. This study will serve as a model to make use of the brackishwater regions to support the coastal population's livelihoods