Answer :
The biggest form of biological pollution is red tides.
Algal blooms known as red tides occur in the ocean or other bodies of water when there are high concentrations of organic materials, typically from agriculture. Algal colonies, which are basic freshwater and ocean plants, can go out of control and have harmful or hazardous effects on humans, fish, shellfish, marine life, and birds. These occurrences are referred to as HABs, or hazardous algal blooms. Despite being rare, human infections caused by HABs have the potential to be fatal or profoundly incapacitating.
Despite the fact that many people call these blooms "red tides," scientists prefer the term "harmful algal bloom." Along Florida's Gulf Coast, a HAB with widespread recognition occurs almost every summer.
Hence, red algal bloom decreases dissolved oxygen.
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