Bangladesh is a major deltaic region with vast floodplains and wetlands that shape national food security, fisheries production, and rural livelihoods. However, these vital freshwater ecosystems are facing severe degradation due to intensified local anthropogenic pressures (agricultural runoff and domestic wastewater) and nutrient loads from upstream transboundary rivers.

Climate change is causing more floods, leaving farmers with less dry land to grow food. This research looks at a traditional local practice where farmers build floating gardens out of water hyacinth. Instead of treating the weed as a useless nuisance, the study uses it as a free, floating platform to grow vegetables.

By adding filter-feeding fish (like Silver carp and Mola) into the same pond, the system works naturally. The fish eat the excess algae, and the vegetables absorb the bad nutrients from the water. This creates a cheap, fertilizer-free ecosystem that cleans the water, provides clean food, and helps poor families survive floods.