Find out what do the terms 'algal bloom' and 'red tides' signify?

(a) Algal bloom : When the algae in water body have excessive growth due to the enrichment of excessive nutrients in it, this refers to algal bloom.
(b) Red tides : When the sea appears red due to the rapid multiplication of red dinoflagellates e.g., Gonyaulax, it is called as red tides.