Embryonic development of the Pacific lamprey, Entosphenus tridentatus.
Embryonic development of the Pacific lamprey, Entosphenus tridentatus, from Japan is described. Egg sizes averaged 1.249 mm (longest axis) and 1.145 mm (shortest axis), the time required for hatching being 11 days at 18 degrees C, shorter than previously reported for a lower water temperature (19 days at 15 degrees C). Early development in E. tridentatus proceeded at a similar rate to that in other lampreys, in spite of different rearing water temperatures for the latter, indicating possible specific differences in basic developmental rates.
Department of Biology, Faculty of Science, Toyama University, Japan. yatsume@sci.toyama-u.ac.jp
Yuji
Y
Yamazaki
Norio
N
Fukutomi
Korenori
K
Takeda
Akihisa
A
Iwata
D000818:Animals; D004625:Embryo, Nonmammalian / Q000502:physiology; D047108:Embryonic Development; D007564:Japan; D007798:Lampreys / Q000196:embryology* / Q000502:physiology; D010063:Ovum / Q000166:cytology*; D012098:Reproduction / Q000502:physiology*; D045483:Rivers; D013696:Temperature