Toxic algal blooms can kill fish, crabs and birds but they seem to be able to avoid algae mats. Anabaena spp. produces neurotoxins and deaths result from paralysis of skeletal and respiratory muscles. Fish are often safe until a pond or dam dries or is drained down, bringing them in contact with floating algae. Fish may also die due to depletion of oxygen during algal blooms.
Check out Dr Loh’s video on toxic algae – http://youtu.be/5maKhOJAFTY
