Effects of diet and temperature on condition, proximate composition and three major macro elements, Ca, P and Mg, in barbel Barbus barbus juveniles

Effects of diet and temperature on condition, proximate composition and three major macro... Six feeding groups of 60 early juveniles (0.6 g) of a rheophilic cyprinid barbel Barbus barbus were reared in triplicate in 18 glass aquaria. Fish fed a commercial formulated dry diet Aller Futura were compared with those on natural food—commercially available frozen Chironomidae larvae at 17, 21 and 25°C. Daily food rations were adjusted according to fish biomass, differences in hydration between the two diets, and rearing temperature. No mortality occurred during experiment. Temperature, and especially diet, both affected whole body proximate and mineral composition of B. barbus juveniles. Under conditions of this experiment the formulated diet Aller Futura seems to satisfy the demands for calcium and magnesium, while an elevated lipid content in this diet was found and marginally deficient phosphorus content can be concluded. These resulted in a depressed content of phosphorus and total minerals in the body, and in elevated lipid content and condition coefficient in the Futura-fed fish, but no visible body deformities occurred. Advantages and limitations of the condition coefficient K were discussed. This is a non-destructive, express indicator that can be used as a supplementary tool for estimation of changes in body proximate composition in fish juveniles of similar size within a population. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Reviews in Fish Biology and Fisheries Springer Journals

Effects of diet and temperature on condition, proximate composition and three major macro elements, Ca, P and Mg, in barbel Barbus barbus juveniles

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Publisher
Springer Netherlands
Copyright
Copyright © 2012 by Springer Science+Business Media B.V.
Subject
Life Sciences; Zoology; Freshwater & Marine Ecology
ISSN
0960-3166
eISSN
1573-5184
D.O.I.
10.1007/s11160-012-9256-8
Publisher site
See Article on Publisher Site

Abstract

Six feeding groups of 60 early juveniles (0.6 g) of a rheophilic cyprinid barbel Barbus barbus were reared in triplicate in 18 glass aquaria. Fish fed a commercial formulated dry diet Aller Futura were compared with those on natural food—commercially available frozen Chironomidae larvae at 17, 21 and 25°C. Daily food rations were adjusted according to fish biomass, differences in hydration between the two diets, and rearing temperature. No mortality occurred during experiment. Temperature, and especially diet, both affected whole body proximate and mineral composition of B. barbus juveniles. Under conditions of this experiment the formulated diet Aller Futura seems to satisfy the demands for calcium and magnesium, while an elevated lipid content in this diet was found and marginally deficient phosphorus content can be concluded. These resulted in a depressed content of phosphorus and total minerals in the body, and in elevated lipid content and condition coefficient in the Futura-fed fish, but no visible body deformities occurred. Advantages and limitations of the condition coefficient K were discussed. This is a non-destructive, express indicator that can be used as a supplementary tool for estimation of changes in body proximate composition in fish juveniles of similar size within a population.

Journal

Reviews in Fish Biology and FisheriesSpringer Journals

Published: Feb 12, 2012

References

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