Loach (1) and gibel carp (3) mounted on the light microscope using the pad made from two overlapping underlying glass (2).

 
 
  Part of: Halačka K, Janko K, Vetešník L (2021) Non-invasive ploidy determination in live fish by measuring erythrocyte size in capillaries. Acta Ichthyologica et Piscatoria 51(3): 275-280. https://doi.org/10.3897/aiep.51.65718