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Comparative data on the reproduction in captivity and ontogenetic development of six of mormyrid species and seven gymnotiform species are reported. Mormyrid fishes: egg diameter ranged from 1.8 (Petroephalus soudanensis) to 3.0 mm (Hippopotamyrus pictus, Campylomormyrus phantasticus); fecundity (egg number per spawning) from 28 to 215 (Pollimyrus isidori) and 121 to 1662 (Campylomormyrus cassaicus);...
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