Authorities have been investigating environmental factors that could have created a trout with two heads.
A number of gigantic amphipods measuring 10 times the regular size have been fished up from the depths.
The unusually coloured crustacean was saved from the dinner table when it was spotted at a fish market.
A three-eyed fish has been caught in a reservoir near a nuclear power plant in Argentina.
Jon Rowe snapped two mysterious shapes in the water while he was photographing a rainbow.
In a heartwarming story of survival, two goldfish survived 4 months without food after an earthquake.
The first ever pictures of a fish using a tool have been taken at Australia's Great Barrier Reef.
Lionfish have been invading reefs along the Florida coast and devastating ocean fish stocks.
Poisonous algae and jellyfish are being found in British waters due to warmer ocean temperatures
A fisherman has reported having his boat rammed and almost toppled over by a giant man-eating shark.
An increase in ocean acidity is making clownfish deaf and vulnerable to predators.
Scientists fear the non-native lionfish may be taking over the Caribbean reefs in great numbers.
A mutant crab with three pincers has been fished up in a lobster pot off the coast of Northumberland.
Capuchin monkeys have come up with their own tool-conserving method to fish for termites.
Whale sharks could prove to be even bigger than first thought at over 20 metres in length.
Over two thousand fish floated dead to the surface after a strange object had hovered overhead.
The permanantly miserable looking blobfish is facing extinction due to overfishing.
Biologists have discovered a remarkable fish, the European eelpout, that suckles its young.
An angler in the US had quite a shock when a fish he'd caught bit him with distinctly human-like teeth.
A new study in to the behaviour of the flying fish has revealed that it can stay in the air for a staggering 45 seconds.