Those growing out barramundi in their Aquaponics setup will most likely experience issues with the cool weather, and the most common is saprolegniaisis. Make sure you run your UV and enrich their diet with vitamin C. Feed sparingly during the cool weather. If possible to heat their tanks, the better it is. Keep water temperature above at least 20-22 degrees Celsius.
Similar conditions can happen with cool water tolerant fishes such as koi and goldfish. So, keep an eye on them.
