J. Knauer et Pc. Southgate, EVALUATION OF MICROENCAPSULATED SQUID OIL AS A SUBSTITUTE FOR LIVE MICROALGAE FED TO PACIFIC OYSTER (CRASSOSTREA-GIGAS) SPAT, Journal of shellfish research, 16(1), 1997, pp. 137-141
The potential of gelatin-acacia microcapsules (GAM) containing squid o
il as a replacement for a diet of live microalgae (LMA) consisting of
a 1:1 mixture of Chaetoceros muelleri and T-ISO was assessed for Pacif
ic oyster (Crassostrea gigas) spat. Shell length, dry weight, and ash-
free dry weight (AFDW) of spat was negatively correlated with the diet
ary level of GAM after 28 days. However, shell length, dry weight, and
AFDW of spat fed 80% LMA plus 20% GAM were not significantly differen
t from those of spat fed a 100% LMA ration. Furthermore, the nutrition
al value of GAM was indicated by the significantly higher AFDW of spat
fed 80% LMA plus 20% GAM and 60% LMA plus 40% GAM compared with that
of spat fed the same LMA ration without GAM supplementation. When 40 a
nd 60% of LMA were replaced by GAM, the increases in AFDW of spat were
89 and 77% that of those fed 100% LMA, respectively. The AFDW of spat
fed the 100% GAM diet was significantly higher compared with that of
unfed spat. The results show that GAM could potentially replace up to
20% of LMA used in commercial hatcheries without affecting growth rate
s.