. Bulletin - Southern California Academy of Sciences. Science. Fig. 1. Representative photographs of female California Sheephead ovarian follicle development. Bars in the lower left corner of each photo represent 200 micrometers. (A) Immature female gonads. (B) Maturing ovaries. (C) Mature ovaries. (D) Regressing/recovering ovaries. AT = atretic follicle. CO = chromatin nucleolar oocyte. PO = perinucleolar occyte. POF = post-ovulatory follicle. YVO = yolk vesicle oocyte. YGO = yolk granule oocyte. Histological analysis of gonads throughout the year showed seasonal changes within the structure
. Bulletin - Southern California Academy of Sciences. Science. Fig. 1. Representative photographs of female California Sheephead ovarian follicle development. Bars in the lower left corner of each photo represent 200 micrometers. (A) Immature female gonads. (B) Maturing ovaries. (C) Mature ovaries. (D) Regressing/recovering ovaries. AT = atretic follicle. CO = chromatin nucleolar oocyte. PO = perinucleolar occyte. POF = post-ovulatory follicle. YVO = yolk vesicle oocyte. YGO = yolk granule oocyte. Histological analysis of gonads throughout the year showed seasonal changes within the structure of female gonads (Figure 1). During the winter season, adult females exhibited only primary growth oocytes (chromatin nucleolar oocytes and perinucleolar oocytes) and atretic follicles (Figure ID). Follicle development (ovarian follicle stage densities - yolk globular oocytes and atretic follicles) differed across seasons (Kruskal- Wallis: H = , = 3,p = ; Figure 2A; Kruskal-Wallis: H = , = 3,p = ; Figure 2B). Atretic follicle count data were normalized by adding to all values and log transforming. Oocyte development became evident during the spring and summer months and peaked in the summer, with relative mean density of summer yolk globular oocytes greater than in spring (Figure 2A). No yolk globular oocytes were observed in winter samples. The densities of atretic follicles peaked in the fall and winter and were lowest in the summer (Figure 2B). Morphological Development and Seasonal Changes of Testes Gonadal transition from female to male and subsequent male development was divided into five classes, with the first three classes considered transitional. During the early stages of sexual transition, chromatin nucleolar oocytes, perinucleolar oocytes, and atretic follicles were observed within the tissue (Figure 3A), along with developing spermatocysts that became more common in mid-transitional fish (Figure 3B). In early transitional
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