Photo-identification is a way to identify individual animals. This is useful for many things, but it is especially useful as a tool to understand and monitor the status of a population of animals. For dolphins, the dorsal fin, (the fin on the back), can act as an individual identifier, like a finger print. But, it isn’t 100% as there are individuals that have non-distinct fins. Most dolphins, however, have various marking or nicks on the trailing edge of the dorsal fin that are distinct and unique.

Scientists studying cetaceans (Whales, dolphins and porpoises), that use photo-identification for their research must have a research permit issued from The National Marine Fisheries Service (NMFS)if they collect photos while on a boat. Why, you ask? Because boats can be a source of agitation for many dolphins and marine mammals are protected under the Marine Mammal Protection Act, 1972. If, however, photos are taken from a land point, there is no need to obtain a NMFS research permit.

When I started this project, I wanted to create a citizen science program for dolphins and I wanted to get interested people to submit photos of dolphins. But, I admit, I was a bit apprehensive at first because I didn’t want to promote any illegal actions against dolphins. So, in this blog, I am letting people know that I am really interested in getting pics of dolphins and dolphin dorsal fins in the Port Aransas Channel or surrounding area. But…….Please only take pictures from the land, like a jetty, Roberts Point Park in Port Aransas, the beach, a bridge, etc. Or, if you happen to be on a dolphin watching boat, and you get some good images, please share! (Dolphin watching boats need a NMFS permit).

In this blog, you will see many images of dolphins’ dorsal fins. Please note that you will see a series of distinct dorsal fins as well as non-distinct ones. Please share your feedback and let me know if you have any questions!