are coming down for this warm tropical salty water where they can really relax and -- >> reporter: katherinaishermen to develop a conservation focused eco-tourism program. >> when the whales win, everyone wins. people here really understand. >> reporter: former fishing boats have now been repurposed that whale-watching vessels. >> a whale just jumped! >> reporter: which are really tail watching vessels. when whales dive they flash their tails, known as flukes. when the hump backs are in residence here, they put on quite a show. >> this is just amazing! i have never seen this before. >> reporter: audley took these photos on the boat. on land, we got online and that's where this tale gets a little deeper. seven times, wow. >> wow. so we have seen this before. it has an i.d. >> reporter: this whale is crc 18946. this one crc 18241. turns out, we weren't the first to watch these bhaels. >> these are all the pictures that different people have taken of this whale. >> reporter: every whale's tail is unique. the ridges of the top, the colors and patterns of the fluke, it's like a fingerprint. a clu