Fig. 4 in 17,20β-P and cortisol are the main in vitro metabolites of 17-hydroxyprogesterone produced by spermiating testes of Micropogonias furnieri (Desmarest, 1823) (Perciformes: Sciaenidae)

Fig. 4. Plasma level of 17,20ss-P in males at different stages of development sampled at the Río de la Plata estuary. 1: Immaturetestis; 2: Developingtestis (earlyspermatogenesis); 3: Fully developed testis (whole spermatogenesis), 4: Spermiating testis; 6: Resting testis. n = number of fish collected for each stage.