BIOTIC Species Information for Ensis ensis
|Researched by||Jacqueline Hill||Data supplied by||MarLIN|
|Refereed by||This information is not refereed.|
|Reproductive Season||Summer||Reproductive Location||Insufficient information|
|Reproductive frequency||Annual episodic||Regeneration potential||No|
|Life span||11-20 years||Age at reproductive maturity||3-5 years|
|Generation time||Insufficient information||Fecundity||Insufficient information|
|Egg/propagule size||Insufficient information||Fertilization type||Insufficient information|
|Reproduction Preferences Additional Information||Life span
The life span of Ensis ensis is likely to be in excess of 10 years. The other two British species Ensis siliqua and Ensis arcuatus are also very long-lived, with a life-span up to 18 years (E. Fahy pers. comm.).
Razor shells in Britain do not appear to breed before they are three years old (Henderson & Richardson, 1994). Breeding occurs during the summer but larval settlement is not successful every year, and recruitment of juveniles is irregular (Hayward et al., 1996). Breeding probably occurs during spring and the veliger larvae has a pelagic life of about a month (Fish & Fish, 1996). Studies on razor shells from North Wales showed that individuals of Ensis ensis were mature in July but were spent in August, indicating that spawning had occurred by the middle of the summer (Henderson & Richardson, 1994).