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- Title
Effect of dietary water on growth of dentex Dentex dentex.
- Authors
Chatzifotis, Stavros; Papadakis, Ioannis E.; Divanach, Pascal
- Abstract
This study is concerned with the effect of hyrdated diets on growth and feed performance of Dentex dentex. Three levels of dietary water were tested: 7%, 20% and 40%. For the 7% level a commercial feed was used and the 20% and 40% water levels were obtained after adding an appropriate amount of deionized water to the commercial feed and mixing the pellets well. The diets were offered to fish by self-feeders, by which fish were allowed continuous access to diets after activating the self-feeders; by belt feeders, by which the diets were fed continuously and in excess over a 12 h interval; and by hand to apparent satiation two times a day. After 151 days of feeding, the group fed on the 20%-water diet showed significantly ( P < 0.05) higher growth rate than the 7 and 40% groups, while no significant differences were observed in feed conversion rate or daily feed consumption. The means of feed delivery did not influence growth rate. Self-feeder, belt and hand feeding all gave comparable growth. Fish fed the more condensed 7%-water diet had smaller stomachs than fish fed the larger volume 40%-water diet. In the stomach, all groups of fish hydrated their digesta within 2 h after feeding to a moisture content of around 60%. Apparently no difference in digestive process was observed between groups. It was concluded that the addition of water in diet at the level of 20% has a beneficial effect on dentex growth.
- Subjects
DENTEX; FISH growth; FISH nutrition; SPARIDAE; PERCIFORMES; SIZE of fishes; FISHERY sciences
- Publication
Fisheries Science, 2005, Vol 71, Issue 6, p1243
- ISSN
0919-9268
- Publication type
Article
- DOI
10.1111/j.1444-2906.2005.01089.x