...that tuna and some species of sharks are warm-blooded, and able to raise their body temperature significantly above that of the ambient water surrounding them?
File:Ichthus.svg...that Ichthys is a symbol resembling a fish, used by early Christians as a secret symbol and is now known colloquially as the "Jesus fish." Ichthus (ΙΧΘΥΣ, Greek for fish) is an acronym to "Jesus Christ God's Son is Saviour"?
...that the Little Mermaid statue of Copenhagen, a popular target of vandalism, has had its arm and head sawn off, painted a red bra, draped in a burka, blasted off its rock possibly with dynamite, and attached to a dildo?
File:Tizil u0.gif...that some species of tilapia are sometimes called St. Peter's fish from the account in the Christian Bible about Peter catching a fish that carried a shekel coin in its mouth?
File:Sharks Lateral Line.svg...that the lateral line, a faint line running lengthwise down each side of the body of a fish, is a sense organ used to detect movement and vibration in the surrounding water?
File:Spearfish remora.jpg... that remoras have been used for catching sea turtles: when a turtle is sighted the remora with rope attached to its tail is released from the boat; it usually heads directly for the turtle and fastens itself to the turtle's shell, and then both remora and turtle are hauled in?
File:Common carp.jpg...that a popular Chinese lyric circulating two thousand years ago relates how a man far away from home sent back to his wife a pair of carps, in which when the wife opened the fish to cook was found a silk strip that carried a love note?
File:Oncorhynchus mykiss.jpg...that there are two forms of rainbow trout; the freshwater form and the "steelhead" form which spend 1 to 2 years maturing in salt water then return to fresh water to reproduce?
File:Icefishuk.jpg...that blood of icefishes is transparent because they have no hemoglobin and/or only defunct erythrocytes. Their metabolism relies only on the oxygen dissolved in the liquid blood, which is believed to be absorbed directly through the skin from the water?
File:Chinook salmon.jpg...that the Chinook salmon, depending on the timing of adult entry into fresh water, are typically divided into "spring chinook", "summer chinook", and "fall chinook"?
File:Opsanus beta 1.jpg...that the male toadfish, trying to attract females, "sing" so loudly that they have disrupted people on houseboats?
File:ChromisNiloticus.jpg...that in the 'loaves and fishes' Bible story, tilapia is the fish Jesus is purported to have multiplied to feed 5000?
File:Beaver pho34.jpg...that in the 17th century, the Roman Catholic Church ruled that the beaver was a fish for purposes of dietary law? Therefore, the general prohibition on the consumption of meat on Fridays during Lent does not apply to beaver meat.
File:Pterapogon kauderni1.JPG...that the Banggai cardinal (Pterapogon kauderni) was recently denied protection under CITES because the fish can be captive-bred and "it appears that a listing in Appendix II is not necessary and, on the contrary, could be counterproductive as favouring illegal activities"?
File:Dallia pectoralis (line art).jpg...that the Alaska blackfish (Dallia pectoralis) is able to safely weather water temperatures at 0C for extended periods, and in lab tests has been able to survive being super-cooled to temperatures as cold as -20C so long as it is kept free of ice crystals?
...that the yoyo loach (Botia almorhae) from India and Pakistan is named for their black and white patterns, which often can be seen to spell "yoyo" especially in younger specimens?
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