[dekhn]

zebrafish are trivial, they are basically tropical fish that were repurposed for scientific research. temperature, ph, feeding, and cleaning the tank are the key steps.

Maintaining a population of zebrafish for scientific research is a bit more challenging; you need to maintain a continuous environment, adhere to a protocol, etc, to reduce all the variables that would your make your research results less reproducible.

zebrafish are imho one of the truly great model organisms- more interesting to work with and more convenient for many things. If I hadn't picked tardigrades for my microscopy/computer vision projects, I would have gone with zebrafish.