Microbes in fish guts help shape ocean chemistry

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A new study reveals that bacteria living inside marine fish play a key role in producing calcium carbonate, influencing ocean health and carbon storage. The findings challenge previous assumptions that fish alone handled this process. Researchers from the University of Miami led the work published in PLOS Biology.

Scientists found that gut microbes in bony fish, known as teleosts, work with their hosts to form solid calcium carbonate pellets called ichthyocarbonates. These minerals help regulate ocean chemistry as fish drink seawater to stay hydrated. Experiments with Gulf toadfish showed higher production in saltier water conditions.

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Coral reefs host unique microbes with medical potential

Scientists have discovered that coral reefs contain diverse communities of microbes, many previously unknown, that produce compounds with potential uses in medicine and biotechnology. The findings come from a large-scale study across the Pacific.

Scientists uncover ocean methane source tied to phosphate scarcity

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Researchers at the University of Rochester have identified a key mechanism for methane production in the open ocean, driven by phosphate scarcity. The discovery, published in Proceedings of the National Academy of Sciences, suggests warming oceans could boost these emissions, creating a potential climate feedback loop. This resolves a long-standing puzzle about methane in oxygen-rich surface waters.

May 12, 2026 19:33

Brazil fossil reanalysis challenges early animal origins

April 18, 2026 11:09

Study finds sharks and tuna risk overheating in warming oceans

April 15, 2026 00:49

Social bonds shape gut bacteria in Seychelles warbler birds

April 13, 2026 06:32

Study links modern living to higher oestrogen-recycling gut bacteria

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