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Enhancement of stress resistance of the guppy Poecilia reticulata through feeding with vitamin C supplement
Lim, L.C.; Dhert, P.; Chew, W.Y.; Dermaux, V.; Nelis, H.; Sorgeloos, P. (2002). Enhancement of stress resistance of the guppy Poecilia reticulata through feeding with vitamin C supplement. J. World Aquacult. Soc. 33(1): 32-40. dx.doi.org/10.1111/j.1749-7345.2002.tb00475.x
In: Journal of the World Aquaculture Society. World Aquaculture Society: Baton Rouge, La.. ISSN 0893-8849; e-ISSN 1749-7345, more
Peer reviewed article  

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Keywords
    Aquaculture systems > Aquarium culture
    Biological stress
    Composition > Chemical composition > Feed composition
    Diets
    Fauna > Aquatic organisms > Aquatic animals > Fish > Ornamental fish
    Feeding experiments
    Nutrition > Animal nutrition
    Properties > Biological properties > Biological resistance
    Vitamins > Vitamin C
    Fresh water

Authors  Top 
  • Lim, L.C.
  • Dhert, P., more
  • Chew, W.Y.
  • Dermaux, V.
  • Nelis, H.
  • Sorgeloos, P., more

Abstract
    This study investigated the use of vitamin C supplement in formulated diets and live Artemia juveniles to enhance the stress resistance of the guppy Poecilia reticulata. To evaluate the stress resistance, fish were subjected to osmotic shock in pre-aerated water containing 35 ppt sodium chloride. Ascorbyl acid-poly phosphate and ascorbyl palmitate were used as vitamin C sources for formulated diets and live Artemia juveniles, respectively. Results showed that guppies fed moist formulated diets supplemented with ascorbic acid at 1,000 mg/kg or 2,000 mg/kg diet displayed significantly higher levels of stress resistance than fish fed control formulated diet for 13 d. The stress resistance of fish fed a lower dose (200 mg/kg diet), however, did not differ significantly from that of the control. On the other hand, the stress resistance of guppies fed Artemia juveniles bio-encapsulated with 10% or 20% ascorbyl palmitate did not show significant difference from that of fish fed control Artemia after 20 d. The stress resistance of these three groups of Artemia-fed fish, however, was significantly higher than that of fish fed the control formulated diet. Biochemical analyses showed that raising the ascorbic acid level in feeds resulted in a concomitant increase in the incorporated ascorbic acid level in the whole-body tissue of the guppy. The increased stress resistance of the guppy fed a vitamin C supplemented diet has also been demonstrated in four commercial farms. The potential application of the improved stress resistance in the ornamental fish industry was discussed.

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