Larval development of the New Zealand geoduck panopea zelandica (Bivalvia : Hiatellidae)

RSNZ Publishing
Publication Type:
Journal Article
New Zealand Journal of Marine and Freshwater Research, 2003, 37 (2), pp. 231 - 239
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The larval development of the New Zealand geoduck, Panopea zelandica, grown under culture conditions was described through measurements of shell morphpmetry using video image analysis, photomicrographs and scanning electron microscopy (SEM). Gametes were stripped from ripe broodstock and eggs fertilised with a dilute sperm solution. Developing larvae were maintained at 17 +or- 1 degree C. Fertilised eggs developed into trochophores within 12h and D-stage larvae (105.3um shell length) within 24h. Larvae spontaneously settled after c. 16 days at c. 247um shell elngth. Measurement of shell morphology including total length totl height hinge length length of anterior end, and umbo length and heoght wre adequate descriptors of larval development. SEM indicated that the proviculum of D-stage and developing veliger larvae lacked any teeth although there was some development of a small lamelliform tooth ont he hinge structure of newly settled post-larvae. Prominent spines common on dissoconch shells of other hiatellid clams were absent in newly settled post-larvae of P. zelandica. The data presented here are the forts descriptors of the larval development and larval biology of P. zelandica. The relative ease of spawning and rearing of P. zelandica suggests that teh development of commercial hatchery technology for this species warrants further investigation.
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