FIG. 4.

The anal fin morphology changes from a simple fin fold to a rayed fin. (A) Anal fin phenotype 1 (B) anal fin phenotype 2 (C) anal fin phenotype 3 (D) anal fin phenotype 4 (E) anal fin phenotype 5. (F) The distribution of anal fin phenotypes 1–5 by SL as the fish grows to adulthood. (G) Close up of anal fin phenotype 2. (H) Close up of anal fin phenotype 3. (I) Close up of anal fin phenotype 4. (J) Close up of anal fin phenotype 5. Arrowheads indicate forking points of fin rays. Color images available online at www.liebertpub.com/zeb