Female zebrafish (Danio rerio) do not prefer mutant longfin males

When we presented longfin and normal male zebrafish to females in an aquarium experiment, females did not spend more time adjacent to longfin than normal males and did not interact more with longfin than normal males. When we tested for effects of longfin mutants on male-male interactions by comparing aggressive interactions between two normal males to interactions between a normal male and a longfin mutant male, there was no difference in male-male aggression. These results suggest that neither male nor female zebrafish use fin size in evaluating male status.