Have you ever seen an orange shark? The above fish was caught this month by Garvin Watson in the Pacific Ocean off Costa Rica.  This was a 6-foot 6-inch nurse shark.  Watch this video. That catch made me wonder about other oddities in nature.  For example, is there a red shark?  The answer, apparently, is no.   I once had an elaborate aquarium, a few fish were  red-tailed black sharks .  However, this fish belongs to the carp family, and only the tail, caudal penuncle, was red.  Mine only grew to maybe three inches, but these can get up to 6 inches.  They are found in Thailand. There is also the  rainbow shark , also from Southeast Asia. The reddest of these aquarium fish identified as a shark (and all of them aren't sharks), is the albino rainbow shark. A similar fish specie is the Galactic Purple Shark. About real sharks, there is a  lemon shark , but the skin is only somewhat yellowish.  Grows to 11 feet. There ar...