Gumm et al XXXXXXXXXXstudied the preferences of female zebrafish for males with several possible fin characteristics. Each zebrafish can be long fin, short fin, or wildtype. Do females have a...

Gumm et al. (2009) studied the preferences of female zebrafish for males with several possible fin characteristics. Each zebrafish can be long fin, short fin, or wildtype. Do females have a preference for a particular fin type? In each trial, a female zebrafish (the focal individual) was placed in the central part of an aquarium. At one end, behind a divider, was a male of one of the fin types. At the other end, behind a divider, was a male of a contrasting fin type. The males are referred to as the stimulus fish. The researchers recorded the amount of time each female spent in the vicinity of each stimulus fish, yielding two measurements for each trial.