Laboratory observations on early development of the oncaeid copepod Triconia canadensis from the mesopelagic zone of the western subarctic Pacific

• Published in: Journal of the Marine Biological Association of the United Kingdom
• Main Authors: Nishibe, Yuichiro, Ikeda, Tsutomu
• Format: Article in Journal/Newspaper
• Language: English
• Published: Cambridge University Press (CUP) 2007
• Subjects: Aquatic Science; Pacific; Subarctic; Copepods
• Online Access: http://dx.doi.org/10.1017/s0025315407055336; https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0025315407055336

Egg development time and hatching success were determined for the oncaeid copepod, Triconia canadensis , from the mesopelagic zone of the western subarctic Pacific. The egg development time was estimated to be 74.7–84.5 days at in situ temperature (3°C), which is much longer than those reported previously on the other oncaeid copepods even if the differences in experimental temperatures are taken into account. The egg hatching success varied between 50 and 100%, with a grand mean of 88%. The newly hatched nauplii of T. canadensis were elongate ellipsoid in shape, and had many large-sized lipid droplets in their body. Possible adaptive significance of apparent longer egg developmment time of T. canadensis is discussed in the light of their life cycle strategy.