Many scientists believe HABs are on the rise due to pollution of coastal waters, the spread of exotic plankton species by ships, and climate change.
Baitsesaense ba re tshenyo e ntsi e bakilwe ke ditsuatsue, go ata ga ditlhapi tsa crown-of-thorns starfish [Acanthaster planci] le go tswa mmala ga dikorale ka ntlha ya go tlhatloga ga themperetšha mo lewatleng.