| Abstrak/Abstract |
The effect of different initial time of artificial feeding to the growth and the activities of
digestive enzymes of humpback grouper larvae Cromileptes altivelis (Valenciennes 1828).
Humpback grouper is an economically marine finfish commodity, so it is important to scale up
its culture. In aquaculture, feed is dominantly affecting to fish growth. Besides live feeds, the
artificial feed is also given to fulfill the need of nutrient for larvae. However, the capability of
larvae to digest the artificial feed is still limited because of its simplicity and immaturity of
digestive system structure. Digestive enzymes are a biological indicator to figure out the
capability of larvae to digest the artificial feed. This research was conducted to find out the
influence of different initial time of artificial feeding to the growth and digestive enzyme activity
of humpback grouper larvae. Larvae rearing were done in hatchery. Larvae were fed with live
feed rotifers started in the evening of the second day. The treatment given in this research was
the difference initial time of artificial feeding, i.e: (A) given at 8 days old larvae and (B) given at
13 days old larvae. The variable observations were the growth and digestive enzyme activity
of larvae. The results indicate that the different initial time of artificial feeding influenced to the
growth and digestive enzyme activity of humpback grouper larvae. Total length, body weight,
length of dorsal spine and ventral spine of 30 days old humpback grouper larvae on treatment
A were 17.47±2.35 mm, 0.11±0.04 g, 6.83±0.45 mm and 5.07±0.50 mm, respectively, while on
treatment B were 13.23±2.53 mm, 0.04±0.02 g, 5.73±1.11 mm and 4.48±0.50 mm, respectively. Up
to 30 days old larvae, protease and amylase enzymes activities of larvae on treatment A was
higher than on treatment B, while lipase enzymes activity of larvae on treatment B was higher
than on treatment A. Therefore, the different initial time of artificial feeding gives the different
effect on the growth and the activities of protease, amylase and lipase enzymes of humpback
grouper larvae.
Key words: artificial feed, growth, digestive enzyme activity, humpback grouper, larvae
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