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I never took a fish-id specialty because my uncle was a marine biologist and I did most of my diving over the first few years with him and didn't need it because he was a walking encyclopedia about such things.
That experience, however, DID confirm to me that pretty much everyone would benefit from a fish-id specialty.
Think about a hiker in the woods. If you're going to go hiking to look for a honey badger then it might be a good idea to know it's habitats, its diet, habits, whether or not it's dangerous to humans and maybe even if it's nocturnal. You might not even recognise one when you see it if you don't and if you don't know anything about it then you may search every square inch of the Appalachian Mountains and become very frustrated by your efforts, to the point of even thinking that they don't exist.
Or join REEF and watch some of their many fishinairs which are videotaped. Then join one or more of their regional discussion groups on facebook and discover that fish sex is messy and there are all sorts of hybrids and anomalies. When they just cast their heritage into the ocean who knows what all mixes with what. Fun to watch the pros discuss and debate what is and is not a species and what are and are not identifying traits.
Fish ID was an option as one of the specialties for my AOW course. It didn't tell me where to hike (dive) to find them, what they ate, or what time of the day to search for them. It gave shapes of the families, markings and names. That was about it. Now..., I did not take that specialty as I felt I could learn more on youtube than in the course. Things could have changed from four years ago, or there could be more in a "full fledged course". But, I still think I could learn more on youtube than going to Panama City, FL to take a fish ID course.
Fish ID was an option as one of the specialties for my AOW course. It didn't tell me where to hike (dive) to find them, what they ate, or what time of the day to search for them. It gave shapes of the families, markings and names. That was about it. Now..., I did not take that specialty as I felt I could learn more on youtube than in the course. Things could have changed from four years ago, or there could be more in a "full fledged course". But, I still think I could learn more on youtube than going to Panama City, FL to take a fish ID course.
Well, Fish ID was useful back before Youtube existed. I guess nowadays one could learn everything about scuba diving from the Internet. Why bother with courses.