Freshwater fish — an important source of protein in the global food supply — could find themselves struggling to procreate and survive.

Some corals glow bright after a warm ocean spell, rather than bleaching and dying, as a final effort to help attract algae.

Known as a siphonophore Apolemia, it looks like an "incredible U.F.O," a researcher said.

It would be the third such mass coral bleaching to hit the world's largest reef system in five years.

"A single thread [of plastic] in the stomach of a larval fish is potentially a killer."

Most of Mumbai, and other coastal Asian cities, will be submerged.

A change in ocean chemistry is also endangering marine ecosystems, reducing seafood supplies.

Experts say the high concentration of glowing phytoplankton off the coast is a sign of environmental damage.

Chitin, a tough material found in crustacean shells, has plastic-like properties and degrades within a few months.