Figure 3 | Scientific Reports

Figure 3

From: Early warming stress on rainbow trout juveniles impairs male reproduction but contrastingly elicits intergenerational thermotolerance

Figure 3

External body appearance and morpho-histological analysis of gonads in warm and control temperature males. (A, B) Adult trout with typical male phenotype presenting a hook-like jaw, a large whitish testis with abundant spermatozoa; spermatogonia and Sertoli cells are also present. (C, D) Adult trout with typical male phenotype as in (A), but with a smaller testis; testis histology presents similar aspect to (B). (E, F) Adult trout without male-specific secondary sexual characteristics, presenting a thin, reddish gonad, without spermatozoa; most germ cells are spermatogonia. SPG: spermatogonia; CS: Sertoli cells; Spz: spermatozoa. Arrowheads indicate the jaw, which has a hook-like morphology in A and C (mature males), but not in E (immature male). (G) Immunohistochemical detection of undifferentiated spermatogonia in immature testis with a cell surface marker.

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