Galathea

A Vulnerable genera from the “Crustaceans” group, mostly found in Gravel

Gravel

Vulnerable

Crustaceans

Genera Characteristics Recorded Traits Possible Values
Size in cm
  • 1-10 cm
  • <1 cm
  • 1-10 cm
  • 11-20 cm
  • >20 cm
Genera Characteristics Recorded Traits Possible Values
Motility (Adult)
  • Adult
  • Adult
  • Short Range Mobility
  • Sedentary

“Adult”

Motility (Larval)
  • Long Term Planktonic
  • Brooded or Laid Eggs
  • Long Term Planktonic
  • Short Term Planktonic
  • Brooded or Laid Eggs

“Long Term Planktonic” “Brooded or Laid Eggs”

Lifespan
  • 3-10 years
  • >10 years
  • 3-10 years
  • 1-2 years
  • <1 year
Maturity
  • <1 year
  • >4 years
  • 3-4 years
  • 1-2 years
  • <1 year
Fecundity
  • 100 - 1000
  • 1 - 10
  • 10 - 100
  • 100 - 1000
  • 1000 - 10000
  • 10000 - 1 million
  • > 1 million

Image: Galathea © Mark Coombes

Vulnerability

Galathea is a small-medium sized decapod crustacean of 2-10cm body length that belongs to the Family Galatheidae (Squat Lobsters). It is a relatively mobile genus that scavenges detritus, carrion & algae from the surface of rocks & gravel. It is not found on mobile sands & is likely to be vulnerable to both the direct effects of dredging & to sand mobilised during the dredging process.

 

Recoverability

Galathea has a life-span of about 3-10yrs & reaches maturity at about 10 months. As many as 30-600 eggs are carried by the female between January-March. These are fertilised internally & then brooded before being released as zoea larvae into the plankton between January-June. After a period in the plankton the juveniles settle to the seabed from April-August. The wide dispersal of the larvae of Galathea in the plankton assists recolonisation from outside sources. However the relatively long life-span & slow growth rate of this genus implies that restoration of the biomass may take several years after initial recolonisation of the seabed following disturbance.
 

References

  • Biology

    • Bull, 1937
    • Lebour, 1930
    • Lebour, 1931
    • Newell & Newell, 1977
  • Taxonomy

    • Hayward & Ryland, 1995b
  • Distribution

    • Bull, 1937
    • Hayward & Ryland, 1990
    • Hayward & Ryland, 1995b
  • Reproduction

    • Lebour, 1930
    • Lebour, 1931
    • Newell & Newell, 1977