Open Access
Table 1
Description and classification criteria for the reproductive stages of Senilia senilis.
| Stage | Histological characteristics | |
|---|---|---|
| Male | Female | |
| 1. Early gametogenesis | Gonadal tubules filled with spermatogonia, spermatocytes and spermatids, Spermatozoa are absent (Fig. 4A) | Non-mature oocytes at the start of gametogenesis, well arranged (joined) at the periphery of the gonadal tubules, tubule center empty. No mature oocytes (Fig. 4F). |
| 2. Active gametogenesis | Gonadal tubules filled with male germ cells at all stages of development, presence of mature spermatozoa in the center of the tubules (Fig. 4B). | Pear-shaped maturing oocytes still attached to the tubule wall and a few mature oocytes detached from the tubule wall (Fig. 4G). |
| 3. ripeness | Gonadal tubules filled with a thin layer of immature male germ cells (spermatogonia, spermatocytes and spermatids) at the periphery of the tubules and a majority of spermatozoa in the center of the tubules. Very dense (Fig. 4C). | Gonadal tubules filled with mature oocytes detached from the tubule wall, high density (Fig. 4H). |
| 4. Partial spawning | Layer of immature male germ cells visible at the periphery of the tubules (spermatogonia, spermatocytes and spermatids). A lighter, less dense area in the center of the tubules compared to stage 3, reflecting partial spermatozoa emission. Occasionally, free spermatozoa are visible in the egg-laying ducts (Fig. 4D). | Some immature oocytes still at the periphery of the tubules, free mature oocytes frequently observed in the center of the tubules, signs of regression (infiltrated hemocytes in the center of the tubules, cellular material from oocyte regression...) (Fig. 4I). |
| 5. Total spawning or rest | Presence of hemocytes within the tubules, empty tubules or presence of immature male germ cells at the periphery of the gonadal tubules, some residual spermatozoa in the center of the tubules (Fig. 4E). | Some rare residual mature oocytes observed in the center of the tubules or some rare non-mature oocytes in the periphery of the tubules. Presence of hemocytes within the tubules (Fig. 4J). |
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