I am looking for examples where individual hobbyists, scientists, small non-zoo organizations and maybe commercial venues helped in protection, discovery or research of animals ex-situ, especially in Europe.
I found mentions of several freshwater fish which only survived in private tanks. There...
The Goodeid Working Group is a working group which aims to coordinate all keepers of Gooedeid fish for the purpose of their ex-situ conservation.
I know that there are a number of aquarist hobbyists on this site so I strongly encourage anybody who wants to get involved in this effort to do so...