Why zebrafish? I seem to remember fruit flies (drosophila?) from Biology lessons and summink to do with their genetic make up, or was it just they had such a short breeding cycle you could observe changes through successive generations more quickly?It’s a good point. The majority of animals used in medical testing are fruit flies and nematode worms.
Then zebrafish are another major one.
Most would think nothing of swatting a fly in their house or guzzling a cod on a Friday night despite not needing to for survival.