Definition

Unnatural coloured areas in the SEA due to the existence of SHOALS. SEA WATER having a colour other than the blues and greens normally seen. Variations of the colours red, yellow, green and brown, as well as black and white, have been reported. Dis­colorations may appear in patches, streaks, or large areas and may be caused by concentrations of inorganic or organic particles or PLANKTON. See RED TIDE.