Optimization of Artemia sp utilization in Betta splendens larviculture
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Date
2009
Authors
Farag Ghramah, Abdullah Salem
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Abstract
In this study, two feeding experiments were conducted. For experiment (1),
three days-old Betta splendens larvae (mean weight 6.00 ± 0.001 mg) were fed four
different feeding treatments [newly hatched Artemia (NA), Spirulina platensis
enrichment Artemia (SPA), newly hatched Artemia + Spirulina platensis enrichment
Artemia (NA+SPA) and 19 hours post hatched Artemia (19PHA)] for 55 days, to
examine the effect of these feeding on larvae growth. The result showed that, these
feeding treatments did not significantly influence (p>0.05) the final weight gain
(mg), percentage of weight gain, specific growth rate and survival rate. The
carotenoid content of larvae fed with SPA was significantly higher (28.92 ± 0.52
μg/g) than the other three treatments. The C20:4n-6 content (1.30 ± 0.10 %) in larvae
fed with 19PHA was the highest among others. Larvae fed SPA had significantly
lower C20:5n-3 compared to that fed NA and 19PHA. C22:6n-3 content and total
PUFA in larvae fed with NA and NA+SPA was significantly lower (p<0.05)
compared to the other two treatments. Total n-3 PUFA for the larvae fed SPA or
NA+SPA was significantly lower than larvae fed 19PHA (23.22 ± 0.50 %). n-3/n-6
ratio in larvae fed 19PHA was significantly higher (1.84 ± 0.08 %) compared to
other treatments. For the second experiment, the effect of different feeding frequency
on the growth of larvae stocked at different densities was observed by feeding newly
hatched Artemia to the larvae. The results showed that, feeding frequency had
significant effects on larvae final weight and specific growth rate, but had no
significant effects on weight gain, survival rate and total length. Larvae stocking
densities had significant effect (p<0.05) on larvae final weight, weight gain, specific
growth rate and total length, while had no effect (p>0.05) on larvae survival rate.
The results also showed that, no significantly difference (p>0.05) between the 2
larvae feeding frequencies. The mean of larvae stocking densities 20 / tank which
were fed twice and thrice per day was significantly higher (p<0.05) on larvae final
weight, weight gain and total length than the mean of larvae stocking densities at 30
and 40/tank. Feeding frequency and stocking density affected C20:4n-6, C22:5n-3
and total n-3/n-6 ratio of the larvae, but they did not have any effect (p>0.05) on
total saturates and total n-6 PUFA. This study demonstrated that larvae which were
fed SPA or 19PHA in the first experiment and larvae stocked density at 20 / tank in
the second experiment when fed NA twice and thrice daily gave better growth and
high survival rate for Betta splendens larviculture.
Description
Master
Keywords
Biological Science , Larviculture , Feeding