Illustrating tetra mating. This pair of tetras (Copella arnoldi) swim together towards the water's surface (1), attach themselves briefly to the underside of a leaf where the female lays eggs and the male fertilizes them (2), this may be repeated many times until all eggs are laid. The female then leaves but the male guards the eggs until they hatch (3), splashing them with his long caudal fin to keep them moist.
Michigan Science Art (copyright holder)
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