2. Spermatogenesis
2-1. Proliferation of spermatogonia
2-2. Meiosis in fish spermatogenesis
2-3. Spermiogenesis
2-4. Spermiation
2-5. Sperm Maturation

3. Regulation of spermatogenesis in eel in vivo or in vitro

4. The endocrine control of fish spermatogenesis
4-1. Gonadotropins and spermatogenesis
4-2. The regulation of spermatogonial stem cell renewal

5. The regulation of spermatogonial proliferation toward meiosis
5-1. The role of 11-KT in spermatogenesis
5-2. IGF-1 and spermatogenesis
5-3. The regulation of initiation of spermatogenesis by two growth factors; AMH and activin B

6. Initiation of meiosis
6-1. The entry of spermatogonia into meiosis
6-2. The mechanisms of initiation of meiosis in spermatogenesis
6-3. A common point of meiosis in early oogenesis and spermatogenesis
6-4. The downstream factors of DHP
6-5. Trypsin and meiosis
6-6. Trypsin and spermiogenesis
6-7. Trypsin and fertilization

7. The regulation of final maturation of male fish

8. The protection mechanisms of germ cells from chemical-induced stress

9. Conclusion

References

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