There are plenty of fish that don't need year round flows. One famous example that springs to mind is even from that region. https://www.nationalgeographic.org

There are plenty of fish that don't need year round flows. One famous example that springs to mind is even from that region. https://www.nationalgeographic.org/media/west-african-lungfish/ https://www.nationalgeographic.org/media/west-african-lungfi...