Page 74 - New additives and ingredients in the formulation of aquafeeds

scabbardfish showed a 10% increase in weight over those fed on the control
feed (Figure 5). In addition, they also showed a better efficiency in the use
of the feed, with a food conversion rate (FCR) of 1.64 vs 1.92 (Figure 6).
It was concluded that the inclusion of a freeze-dried product, obtained from
crude extracts of the viscera of Aphanopus carbo, at 12 g/kg feed could result
in a significant improvement in growth and FCR in juvenile marine fish.
0.0
0.5
1.0
1.5
2.0
2.5
CONTROL Crude Illex Purified Illex Crude
Aphanopus
Purified
Aphanopus
FCR
ab c ab a bc
Figure 5: Growth of
seabream juveniles fed
on feds including diferent
enzyme extracts obtained
from the viscera of
black scabbardfish and
Argentine shortfin squid.
Each point is the mean of
three replicates. Values
showing a different letter
are statistically different
at p<0.05
Figure 6: Values of feed
efficiency measured
in seabream juveniles
fed on feeds including
diferent enzyme extracts
obtained from the viscera
of black scabbardfish and
Argentine shortfin squid.
Each point is the mean of
three replicates. Values
showing a different letter
are statistically different
at p<0.05.
FCR: Food Conversion
Rate
72 Use of purified extracts from fish viscera as an enzyme additive in feeds for juvenile marine fish