Ecology

Habitat

Depth range based on 6 specimens in 1 taxon.
Water temperature and chemistry ranges based on 1 sample.

Environmental ranges
  Depth range (m): 1 - 10
  Temperature range (°C): 6.524 - 6.524
  Nitrate (umol/L): 10.097 - 10.097
  Salinity (PPS): 32.854 - 32.854
  Oxygen (ml/l): 7.403 - 7.403
  Phosphate (umol/l): 1.161 - 1.161
  Silicate (umol/l): 22.113 - 22.113

Graphical representation

Depth range (m): 1 - 10
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

Trusted

Article rating from 0 people

Default rating: 2.5 of 5

Life History and Behavior

Reproduction

Brooding behavior

C. japonicus is a hermaphroditic, externally brooding anemone. Prior to spawning, a cluster of tentacles retract and the oral disc leans in their direction, forming a groove in the column. Eggs or embryos are expelled from the mouth directly into the groove, which elongates and forms a ring as the animal encircles itself, depositing eggs or embryos. Eggs appear to be fertilized internally, but whether they are produced by self or cross-fertilization is unknown. An individual may brood offspring numbering in the hundreds.

Spawning is seasonal, with reproductive events taking place in the Autumn. Most offspring are retained no later than August, however there is evidence for some being retained for a year or more. Since this species lacks the free-swimming larval stage, offspring develop directly from embryo to polyp, leaving the adult after they have grown to possess 24-tentacles.

  • Ishimura, M. and M. Nishihira (2003). "Direct attachment of eggs to the body wall in the externally brooding sea anemone Cnidopus japonicus (Actiniaria; Actiniidae)." Journal of Ethology 21(2).
  • Uchida, T. and F. Iwata (1954). "On the Development of a Brood-Caring Actinian." Journal of the Faculty of Science, Hokkaido Imperial University, Series VI Zoology 12: 220-224.
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

Supplier: Paul Larson

Unreviewed

Article rating from 0 people

Default rating: 2.5 of 5

Disclaimer

EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

To request an improvement, please leave a comment on the page. Thank you!