Fish development, Atlantic salmon, Salmo salar. Appearance of the embryonic spot in the egg 1, first embryo lineaments 2, appearance of the heart 3, fully formed 4, ready to hatch 5, and hatched 6. Chromolithograph by Pierre Lackerbauer after Jean-Joseph Zéphirin Gerbe from Alfred Fredol’s Le Monde de la Mer, the World of the Sea, edited by Olivier Fredol, Librairie Hachette et. Cie., Paris, 1881. Alfred Fredol was the pseudonym of French zoologist and botanist Alfred Moquin-Tandon, 1804-1863.

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Photo credit: © Florilegius / Alamy / Afripics
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