Data from: Hydrodynamic drag constrains head enlargement for mouthbrooding in cichlids

Sam Van Wassenbergh, Nuno Z. Potes & Dominique Adriaens
Presumably as an adaptation for mouthbrooding, many cichlid fish species have evolved a prominent sexual dimorphism in the adult head. Since the head of fishes serves as a bow during locomotion, an evolutionary increase in head volume to brood more eggs can trade-off with the hydrodynamic efficiency of swimming. Here, the differences between males and females in three-dimensional shape and size of the external head surfaces and the effect thereof on drag force during locomotion...
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