Gill arches, food intake, and absolute mRNA expression of eda and edar.aS. chuatsi preying on a live fish. b Absolute copies of eda and edar in adult S. chuatsi and D. rerio (n = 3 for eda, n = 6 for edar). c The gill arches in adult zebrafish. WT adult zebrafish have 11–14 gill rakers; fewer gill rakers are observed in edar+/− fish. In edar−/− fish, 1–3 gill rakers remain on the outside of the first gill arch, whereas complete loss of gill rakers is observed on the inside of the first gill arch. d, e Intake of brine shrimp (d) and dead prey (e) by adult zebrafish (n = 6). The boxplot elements are defined as: center line, median; box limits, the third and first quartiles; whiskers, 1.5× interquartile range. * indicates a significant difference (P < 0.05).
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