FIG. 4. Frames from a in Pelvic-Fan Flaring and Inflation in the Three-Tooth Puffer, Triodon macropterus (Tetraodontiformes: Triodontidae), with Additional Observations on Their Behavior in Captivity

FIG. 4. Frames from a video of Triodon macropterus, Fish 3 (320 mm SL), recorded during the night (1900–0400 hours) of 16 to 17 November 2020 at the Okinawa Churaumi Aquarium. Frames A–U show behaviors that occurred during a 1:11 minute interval that included 13 buccal cavity expansions and 11 pump-like expansions and retractions of the pelvic fan. We term this behavior pump flaring. No inflation occurred. Supplemental Video 2 (see Data Accessibility) was the basis for this figure.