In the US, almost all animals should be accounted for by the IACUC at the research organization. In practice that includes rats, mice and fish even though the

In the US, almost all animals should be accounted for by the IACUC at the research organization. In practice that includes rats, mice and fish even though the animal welfare act excludes them, because the Public Health Service does not. It does not surprise me that they do not always appear in papers. How often does an experiment end without any result at all? Pretty often.