I agree. If we know the provenance of fish we get, we should tag it. We are learning so much about the evolution of fishes, speciation, local forms, etc that the info could prove useful. That is, if we propagated our fish.The aquarium hobby is far behind other animal hobbies when it comes to keeping species, lines, locales, morphs, true.
First off you can throw out ball pythons. You would be lucky if you can find a wild type ball python now. Almost the same for kingsnakes and corn snakes.
Dart frog hobbyists are quick to squash someone who wants to hybriidize and I have seen people become completely ostracized because of their intentions or actions.
Tarantula keepers take it to another level. Say there was an importation from Brazil in 2020, and in that import came spiders of the species Grammostola pulchripes. Now say in 2024 there was another import from Brazil with the same species. Tarantula keepers will not even breed the two imports together. Read that again. Yep they will only breed 2020 imports together and 2024 imports together. Because they are unsure of the actual species so when in doubt they leave it out.
Sorry but the aquarium hobby is still in the uneducated dark ages.
The killie hobby, a tiny corner, gets it.
Otherwise, this is a consumer hobby, and the progress made on fish breeding is falling back. Breeding fish as I do, I was an average "into it" keeper 20 years ago, but now in our club I get treated like a wizard. It really is high time we reinvented the wheel.