Hatchery Production of
Scallop Larvae (Pecten maximus) –
Survival in Different Rearing Systems
L. Torkildsen, T. Magnesen-2004
Aquaculture International, 12(4-5):
489-507
Abstract:
Scallop farms in Norway rely exclusively on hatchery
production of spat. Larval rearing is one of the most difficult parts of the
production, and several experiments have been performed during the last years
to improve the larval systems. This paper describes results from commercial and
experimental trials obtained between 1996 and 2001. Four different rearing
systems were compared: untreated batch cultures, chloramphenicol-treated batch
cultures, flow-through cultures with filtered water and flow-through cultures
with water from a biofilter. The chloramphenicol-treated batch cultures had
overall significantly higher survival rates than the untreated and flow-through
cultures. There were no significant differences in survival between untreated
and flow-through cultures. The average survival rates for the untreated,
treated and flow-through cultures were 6.8, 23.0 and 8.6%, respectively. No
significant seasonal differences were found for the untreated and treated
larval groups, whereas for larvae reared in flow-through systems survival was
significantly higher in the winter than the spring. Overall best results were
obtained during winter in years with high salinity water in the fjord.
(Department of Aquaculture, Institute
of Marine Research, P.O. Box 1870 Nordnes, N-5817 Bergen, Norway, e-mail: ltork@online.no)