Karachi, November 27, 2025 – The World Wide Fund for Nature-Pakistan (WWF-P) on Wednesday clarified that the striking green discolouration and night-time glow recently observed along Karachi and Balochistan coasts is a harmless natural phenomenon caused by massive blooms of Noctiluca scintillans — commonly known as “sea sparkle” — and has no connection with pollution or harmful algal blooms.
WWF-Pakistan has clarified the reason behind the recent greenish colour of seawater and the glowing light observed at night along the coasts of Karachi and Balochistan — a phenomenon that had caused concern among fishermen and local communities.
Many people had assumed that the… pic.twitter.com/zPKLRTca2g
— The Express Tribune (@etribune) November 26, 2025
WWF-P explained that the vivid colours and bioluminescence are produced by billions of these tiny free-floating organisms and their photosynthetic symbionts. Blooms frequently appear in green or orange hues along Pakistan’s coast and are driven purely by seasonal ocean conditions.
“The organism itself is non-toxic and poses no threat to marine life or human health,” the organisation stressed, dismissing social media speculation linking the spectacle to industrial waste or eutrophication.
Similar large-scale sea sparkle blooms are regularly recorded across the northern Arabian Sea, including the coasts of Oman, Iran, Yemen, Pakistan, and western India.
Marine experts urged the public to enjoy the rare natural light show while reassuring fishermen and coastal communities that fishing and swimming remain safe during this seasonal event.
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