Effects of different diets on the growth and skin color of white angelfish(Pterophyllum scalare)fry
As one of the key techniques in fry fish rearing,feeding management affects survival,growth and development of the fry.An attempt was made to analyze the effect of the feeding management on the growth and body color change of the fry of white angelfish.The fry of white angelfish(Pterophyllum scalare)were fed with three combinations of foods,including commercial microcapsule feed(M group),microcapsule feed with Artemia sp.nauplii(MA group)and fishmeal feed with Artemia sp.nauplii(AF group).The survival,growth and body color of the white angelfish fry fed with different food combinations were analyzed and compared.The results showed that the survival rates in all the groups were more than 82％,where the MA group was significantly higher than the M and AF groups(P＜0.05).The body weight,length,weight gain rate and specific growth rate were significantly higher in the MA group than in the AF group(P＜0.05).The regularity was observed in the body color of different body position in each group with the lightness(L*)being in the order of"abdomen＞operculum＞lower back",the red tonality(a*)being in the order of"operculum＞abdomen＞lower back"and the yellow hue(b*)in the order of"lower back＞abdomen＞operculum".Feeding Artemia sp.nauplii could affect the yellow hue(b*)of P.scalare fry during rearing.The proper use of Artemia sp.nauplii to feed the white angelfish at the right stage of fish rearing helps to improve the growth performance and enhance the ornamental character of the fish body color.
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