BIOTIC Species Information for Idotea pelagica
Researched byAndrew Hosie Data supplied byMarLIN
Refereed byThis information is not refereed.
Reproduction/Life History
Reproductive typeGonochoristic
Developmental mechanismDirect Development
Reproductive SeasonSee additional information Reproductive LocationSediment surface
Reproductive frequencyAnnual protracted Regeneration potential Yes
Life span1-2 years Age at reproductive maturity<1 year
Generation time<1 year Fecundity10-100
Egg/propagule sizeInsufficient information Fertilization typeInternal
Larval/Juvenile dispersal potentialInsufficient information Larval settlement periodSee additional information
Duration of larval stageSee additional information   
Reproduction Preferences Additional Information
  • Reproductive season
  • The reproductive season of Idotea pelagica is closely linked to temperature (Leifsson, 1999). Reproductive effort is at its greatest during periods when the sea water temperature is between 5 and 12 °C (Sheader, 1977; Healy & O’Neill, 1984; Leifsson, 1999). While ovigerous females are found all year round in southern Irish coasts, the highest proportion of ovigerous females are found between December and August (Healy & O’Neill, 1984), while on the Northeast coast of England ovigerous females were found only between April and August (Sheader, 1977). Icelandic populations have their reproductive period further reduced to May to July (Leifsson, 1999). In the more southern extent of its range, the reproductive season of Idotea pelagica would be expected to shift further towards winter.
  • Fecundity
  • Females brood up to 80 eggs for 6-8 weeks (Leifsson, 1999), as with most isopods there is no larval stage and the juveniles appear as the adults, but with 6 pairs of pereopods not 7. Once the eggs hatch, females may then moult and produce a second brood (Healy & O'Neill, 1984).
    Reproduction References Leifsson, 1999, Healy & O'Neill, 1984, Sheader, 1977,
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