Last year, more than 91 metric tons of pollutants were poured into the ocean from the province's 28 estuaries, he said.
The Guangdong provincial government has called for concrete and effective measures to be taken, Li said.
Xie Enyi, a professor at the Fisheries College of Guangdong Ocean University in Zhanjiang, said the growing number of red tides in Guangdong's waters were mainly caused by the increasing number of aquatic farms.
"Now many cities and counties in coastal areas have built farms for fish, shrimp, shellfish and other marine organisms for bigger profits," Xie told China Daily on Wednesday.
Xie predicted red tides will increasingly haunt Guangdong unless effective and measures are introduced to prevent and fight ocean pollution.
"Coastal cities and counties should reduce the number of farms cultivating fish and other marine creatures. Instead, more farms for seaweed, kelp, laver and other marine plants should be built to help improve the marine environment," he said.
"Meanwhile, we need to raise the awareness of protecting the sea in the province, particularly along the coastal areas."
He urged government departments to expand and tighten examinations to control red tide and prevent it from spreading.
Guangdong's ocean economy came to more than 1.1 trillion yuan ($177 billion) last year, up 12.3 percent year-on-year.
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