Rhee, W.Y.
Abstract:
For over 20 years in the U. S., efforts by academia, government, and
the industry for hatchery seed production of the rock scallop
Crassadoma gigantea remained as a difficult challenge. The
conditioning and spawning of the broodstock, the setting of the
larvae, and growout beyond pediveliger stage remained as bottlenecks
to the hatchery seed production. The application of "traditional
hatchery techniques" of intertidal clams, mussels, and oysters to the
rock scallop, a subtidal species appears to have been the major cause
in hampering the development of a successful rock scallop seed
hatchery. The objective of this study was to apply "nontraditional
techniques" for successful rock scallop hatchery seed production.
Broodstock conditioning was done with lowered temperatures (4 - 7
C) to suppress spawning, spawning of the broodstock was induced
with serotonin (0.2 ml/10^4 M solution), and the pediveligers put
directly into the open ocean for growth after they reached ca 250 u
size. Preliminary results indicate good survival rate of the juveniles in
the open sea. Previously unrecorded dribble spawning in mature rock
scallops and protandric hermaphroditism in 2 year old rock scallops
were also observed in the study.
(The Seafood Advisor, P.O. Box 658, Bedford, MA 01730, USA)