Gonadal steroid hormone patterns in saddleback wrasses are paralleled by differences in gonadal ultrastructure and steroid hormone synthetic capacity. Females exhibited greater gonadal E2 synthetic capacity than advanced sex changers in vitro when stimulated by salmon gonadotropin, while terminal phase males showed greater 11KT synthesis than females in vitro with advanced sex changers being intermediate . A follow up study compared terminal phase males with female-mimic initial phase males . Initial phase males are externally indistinguishable from females except for the genital papilla. This external similarity is likely important for success in ‘sneaker’ mating tactics (a topic I return to in section 3). Initial phase male saddleback wrasses show both lower plasma levels and lower production of 11KT by the testes in vitro than terminal phase males.
Consistent with most other sex modifying kinds, highest degrees of Elizabeth
Stoplight parrotfish (Sparisoma viride) exhibit a similar pattern of sexual phenotype differentiation characterized by diandric protogyny with colorful and territorial terminal phase males and initial phase males that are very similar to females in external morphology. Continue reading “Gonadal steroid hormonal activities described to other gender altering types is fundamentally in line with those people getting saddleback wrasses”