51³Ô¹ÏÍø

a) fertilized salmon egg at the beginning of development, b-d) fertilized salmon egg after 7 weeks of development, e) fertilized trout egg at the beginning of the development, f) fertilized trout egg after 7 weeks of development, g) trout after hatching from the egg, h) trout about 3 weeks old, i) visual representation of the artificial fertilization of trout eggs, k) pipette for fish eggs, l) small Pliers for sorting out dead fish eggs, m-p) Incubators for fish eggs with different grids. Woodcut engraving, published in 1881.