Did you know that the EggSorter works with small biological entities from different species: from zebrafish, medaka and killifish eggs to xenopus oocytes and embryos? Sounds cool, right? But do you know where these species exactly come from and what they are used for in research? This article presents the ecology of these organisms and gives a glimpse of how they are used in research. Zebrafish Medaka Killifish African clawed frog Conclusion References Zebrafish The zebrafish is used as a model organism in laboratories because they are easy to feed…