Reproductive conditioning of
Chilean scallop (Argopecten purpuratus) and the Pacific oyster (Crassostrea
gigas): effects of enriched diets
I. Uriarte, A. Farķas, J. Hernandez, C. Schäfer, P.
Sorgeloos-2004
Aquaculture, 230(1-4): 349-357
Abstract:
The quality of diet fed to bivalve broodstock during
reproductive conditioning directly affects growth and survival of their
larval and postlarval progeny. The objective of the present study was to
improve the quality of larval production in the Chilean scallop (Argopecten
purpuratus) and the Pacific oyster (Crassostrea gigas) by testing
of the effects of different experimentally enriched diets on the
conditioning and early development of progeny under laboratory conditions.
The diets used included protein-rich microalgae and mixtures of microalgae
and lipid emulsions. Quality of D-larvae, pediveligers, and 1-mm postlarvae
from the variously fed broodstock was measured to evaluate each diet as
indicators of growth and survival of the early life stages. Biochemical
analyses were carried out on eggs and larvae to determine the effects of the
different diets on these parameters. The main results for the scallops and
oysters were that a conditioning diet containing algae rich in protein
improved larval growth and survival. This effect did not, however, extend
past metamorphosis. Also, the best conditioning diet increased the lipid
content of the eggs, as well as the protein content of the D-larvae,
although the mechanism for this remains unclear.