Environmental Control of Gonadal Maturation in Laboratory-Reared Sea Urchins, Anthocidaris crassispina and Hemicentrotus pulcherrimus : Developmental Biology

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概要

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• Gametogenic processes in laboratory-reared sea urchins, Anthocidaris crassipina and Hemicentrotus pulcherrimus, were compared under different experimental environments. The juvenile sea urchins were obtained by artificial fertilization. After preparatory rearing for 3 months under continuous illumination at 20℃, the juveniles were divided into groups and kept under various light and temperature regimes. The stages in gonadal maturation were determined according to a histological standard. In A. crassispina kept at ambient temperatures, the gonads matured under both continuous light (LL) and continous darkness (DD) simulataneously with those under ambient light (control). In A. crassispina kept under LL, the gonads matured at either constant 20 or 25℃ earlier than those in the control but remained immature at 15℃. In H. pulcherrimus kept under LL, the gonads remained immature as long as the animals were kept at a constant temperature (15, 20, 25℃). If the water temperature was lowered stepwise from 25℃ to 20℃ and after a month to 15℃, the gonads matured about 3 months after the first temperature drop. The gonads of the fully grown sea urchins that had once experienced gonadal maturation in the outdoor tank showed the same response as those of the juveniles to the stepwise temperature drops. It is conceluded from previous [18] and the present results that in A. crassispina, H. pulcherrimus and Pseudocentrotus depressus, the three sea urchin species common to shallow water along the Japanese coast, the environmental factor determining their breeding season is not light but water temperature.

• 社団法人日本動物学会の論文
• 1989-08-15

著者

• YOSHIDA MASAO

  Ushimado Marine Laboratory, Okayama University

• YAMAMOTO Masamichi

  Ushimado Marine Laboratory, Okayama University

• Yamamoto M

  Faculty Of Health Sciences Yamaguchi University School Of Medicine

• SAKAIRI KAZUHIRO

  Ushimado Marine Laboratory, Okayama University

• OHTSU Kozo

  Ushimado Marine Laboratory, Okayama University

• Ohtsu Kozo

  Ushimado Marine Laboratory Okayama University

• Sakairi Kazuhiro

  Ushimado Marine Laboratory Okayama University

• Yamamoto Masamichi

  Ushimado Marine Laboratory Faculty Of Science Okayama University

• Yoshida Masao

  Ushimado Marine Laboratory Okayama University

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