Fish of Trou Caiman

We went to lake Trou Caiman (Camain hole) this morning to see if flamingos were there.  They had already flown away, but we saw these men catching these fish by slapping the water to chase the fish into nets.  Women were preparing them for the market.  Anyone know what they are?

With our guide.

Men slapping the water to chase fish into a net.  They are standing, the lake is shallow.