Common name: Swordfish. Scientific name: Xiphias gladius. Family: Xiphiidae.

(Sorry this is late – it put up a good fight and took a few days to land)

Swordfish: This is a cool fish. Check this out –¬† swordfish have special organs next to their eyes to heat their eyes and brain. Temperatures of 10 to 15C above the surrounding water temperature have been measured.

The heating of the eyes gives them better vision and so improves their ability to catch prey. Only 22 of the more than 25,000 fish species can do this. Marlin, tuna and some sharks can also do it.

The swordfish is named after its bill resembling a sword (Latin gladius) but is also known broadbill in some countries.

They are large, highly migratory and a good predator fish.

Swordfish are elongated, round-bodied, and lose all teeth and scales by adulthood. Found widely in tropical and temperate parts of the Atlantic, Pacific and Indian oceans, and can typically be found from near the surface to a depth of 550m. They commonly reach 3m in length, and the maximum reported is 4.55m and 650kg in weight.