BIOTIC

BIOTIC Species Information for Thyasira gouldi

Researched by

Angus Jackson

Data supplied by

MarLIN

Refereed by

This information is not refereed.

Reproduction/Life History

Reproductive type

Gonochoristic

Developmental mechanism

Direct Development

Reproductive Season

Year round

Reproductive Location

Sediment surface

Reproductive frequency

Annual protracted

Regeneration potential

Life span

Insufficient information

Age at reproductive maturity

Insufficient information

Generation time

Insufficient information

Fecundity

Up to 750 eggs per spawn

Egg/propagule size

Ca 260 µm long

Fertilization type

Internal

Larvae/Juveniles
Larval/Juvenile dispersal potential	<10m	Larval settlement period	Not relevant
Duration of larval stage	Not relevant

Reproduction Preferences Additional Information

The sexes are separate and fertilization probably occurs in the mantle or suprabranchial cavity. Egg development is temperature dependent being (in the laboratory) around 50 days at 10 degrees C and 37 days at 16 degrees C. There is no synchronisation of reproduction and spawning occurs throughout the year. Eggs are white, oval and about 260 microns long. Up to 750 eggs are produced with each spawning. No information is available on the mechanism of spawning or the number of spawnings per year. Fertilised eggs are 'pumped' out of the inhalant tube and being quite dense, sink down onto and stick to the sediment about 1 cm from the opening. Consequently eggs are rarely dispersed by water currents. No information is available about life span but given the known growth rate and maximum size achieved it must be at least 5-10 years.

Reproduction References

Blacknell & Ansell, 1975, Blacknell & Ansell, 1974,