Phase;"Features of the testes";
;Macroscopic;Histological
Immature;"Filiform, occupying less than one-third of the coelomic cavity, measuring 14–30 mm and weighing between <0.01 and 0.01 g, translucent";"Prevalence of primary spermatogonia (Sg1). Lumen of the tubules imperceptible"
Developing;"Flat shape, occupying less than one-third of the coelomic cavity, measuring 15–35 mm and weighing between 0.03 and 0.17 g, whitish colour.";"Secondary spermatogonia (Sg2) and spermatocytes primary (Sc1) identified in spermatocytes along the germinal epithelium. Presence of primary, secondary spermatocytes (Sc1, Sc2), spermatids (St) and spermatozoa (Sz) in the lumen of the seminiferous tubules"
"Spawning Capable";"Sinuous and flat shape, occupying one-third and nearly two-third of the coelomic cavity, measuring 24–45 mm and weighing between 0.12 and 0.47 g. Opaque white colour, unclear irrigation";"Spermatozoa (Sz) present in the lumen of seminiferous tubules. Spermatogonia (Sg1, Sg2), spermatocytes (Sc1, Sc2) and spermatids (St) may be present in the spermatocytes"
Regressing;"Flaccid, haemorrhagic and occupy an average of 2/3 of the coelomic cavity, measuring 24–30 mm and weighing between 0.17 and 0.25 g. Reddish white colour";"Spermatozoa present in the lumen of disorganized seminiferous tubules; germinal epithelium may be continuous or discontinuous. Spermatocytes containing non-released spermatids (St) dispersed by the seminiferous tubules"
Regenerating;"Small and bulky measuring 17–20 mm and weighing between 0.08 and 0.12 g";"Lumen of the seminiferous tubules discrete or undetectable. Spermatogonia Sg1 and Sg2 in proliferation. Germinal epithelium continuous"