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Weaning of greater amberjack (Seriola dumerilii Risso 1810) juveniles from moist to dry pellet


The weaning of greater amberjack (Seriola dumerilii Risso 1810) to a dry diet was studied in two consecutive experiments. The experimental fish were hatchery-produced and grown to their initial size on a soft pellet containing 50% trash fish and 50% commercial dry pellet. In the first experiment, three homogenous groups of greater amberjacks (n = 153, mean weight: 374 ± 43 g), initially adapted for a period of 30 days to a diet with a 40% moisture content, were fed on commercial pellets containing three different levels of dietary moisture (7, 20 and 40%, respectively) for 126 days. We found that fish needed a month to adapt to the 7%- and 20%-moisture diets and that moisture content of the diet had a significant effect on fish growth in terms of increasing feed consumption and lowering feed conversion ratio. The group fed on the 20%-moisture diet not only compensated for the initial adaptation period but presented the higher growth rate and best feed conversion ratio. In the second experiment, all groups of experiment 1 were fed the same commercial diet with a 7% moisture content for 72 days. The group that had been previously fed on the 20%-moisture diet showed the best growth performance. The implication of the above results for the weaning of greater amberjack to dry diets is discussed in terms of the digestion process and physiology.

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Fig. 1
Fig. 2


Bf :

Final biomass

BI :

Initial biomass

Cf :

Condition factor


Feed conversion ratio


Hepatosomatic index

Lb :

Body length


Specific growth rate


Duration of the experiment

Wb :

Body weight

Wf :

Final body weight

WI :

Initial body weight

Wl :

Liver weight

Wst :

Wet stomach weight


Weight of total dry feed supplied

Wv :

Visceral weight


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We would like to thank Dr. P. Katharios, Dr. C.C. Mylonas and Dr. N. Papandroulakis for their advice on the experimental procedures.

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Correspondence to Ioannis E. Papadakis.

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Papadakis, I.E., Chatzifotis, S., Divanach, P. et al. Weaning of greater amberjack (Seriola dumerilii Risso 1810) juveniles from moist to dry pellet. Aquacult Int 16, 13–25 (2008).

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  • Adaptation
  • Dietary moisture
  • Feeding
  • Feeds
  • Greater amberjack
  • Growth
  • Seriola dumerilii