How brackish is the brackish water there? because there are plenty of species of plants that tolerate brackish water, including some species of letuce, beets, barley etc.
You can also breed algae and fish in brackish water, like maybe crucian carp, silver carp or amur carp? Then use their crap to fertilise land?
The first hit on google says 1-4 parts per thousand, or about 1⁄10 as salty as seawater. If 0.5‰ is considered fresh, then that’s probably plenty low to support some plants.
How brackish is the brackish water there? because there are plenty of species of plants that tolerate brackish water, including some species of letuce, beets, barley etc.
You can also breed algae and fish in brackish water, like maybe crucian carp, silver carp or amur carp? Then use their crap to fertilise land?
The first hit on google says 1-4 parts per thousand, or about 1⁄10 as salty as seawater. If 0.5‰ is considered fresh, then that’s probably plenty low to support some plants.