![Photo taken on March 29 shows "red tide", algae bloom in beach in Pula, Croatia. Red tide is a phenomenon caused by algal blooms during which algae become so numerous that they Photo taken on March 29 shows "red tide", algae bloom in beach in Pula, Croatia. Red tide is a phenomenon caused by algal blooms during which algae become so numerous that they](https://c8.alamy.com/comp/2KXMTHD/photo-taken-on-march-29-shows-red-tide-algae-bloom-in-beach-in-pula-croatia-red-tide-is-a-phenomenon-caused-by-algal-blooms-during-which-algae-become-so-numerous-that-they-discolor-coastal-waters-photo-srecko-niketicpixsell-2KXMTHD.jpg)
Photo taken on March 29 shows "red tide", algae bloom in beach in Pula, Croatia. Red tide is a phenomenon caused by algal blooms during which algae become so numerous that they
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![Photo taken on March 29 shows "red tide", algae bloom in beach in Pula, Croatia. Red tide is a phenomenon caused by algal blooms during which algae become so numerous that they Photo taken on March 29 shows "red tide", algae bloom in beach in Pula, Croatia. Red tide is a phenomenon caused by algal blooms during which algae become so numerous that they](https://c8.alamy.com/comp/2KXMTE2/photo-taken-on-march-29-shows-red-tide-algae-bloom-in-beach-in-pula-croatia-red-tide-is-a-phenomenon-caused-by-algal-blooms-during-which-algae-become-so-numerous-that-they-discolor-coastal-waters-photo-srecko-niketicpixsell-2KXMTE2.jpg)