Abstract
Reduction in eel resources and catches of glass eels as seedlings for aquaculture have been a serious concern in recent years in both Europe and East Asia. Thus, technical advancement to produce eel seeds for artificial cultivation is most desired. Fundamental information on oocyte maturation and ovulation and its application to artificial induction of sexual maturation are needed to produce good quality seeds of the Japanese eel. This review introduces hormonal mechanisms of cytoplasmic maturation (such as hydration, lipid coalescence, and clearing of the ooplasm) and the maturational competence (the ability to respond to maturation-inducing steroid) and nuclear maturation (germinal vesicle breakdown). In addition, previous and newly developed methods for induction of spawning have been described.
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Acknowledgments
We thank Prof. B. Senthilkumaran (University of Hyderabad, Hyderabad, India) for his critical reading of the manuscript. This work was financially supported by the Ministry of Education and Science Japan and by the Agriculture, Forestry, and Fisheries Research Council to H.K.
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Kagawa, H., Sakurai, Y., Horiuchi, R. et al. Mechanism of oocyte maturation and ovulation and its application to seed production in the Japanese eel. Fish Physiol Biochem 39, 13–17 (2013). https://doi.org/10.1007/s10695-012-9607-3
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DOI: https://doi.org/10.1007/s10695-012-9607-3