Nutrition & Health

Effect of Feed Type on Growth and Fertility in Ornamental Fish, Xiphophorus Helleri


The effects of feed type on feed intake and conversion, ovary weight, and fertility were studied in red swordtail, Xiphophorus helleri, for 235 days. Five groups of 30-day-old juveniles (0.05±0.001g; 16.84±1.59 mm) were fed Artemia, earthworms, liver, pelleted feed, or a mixed diet. Mean body length and weight were higher in fish that consumed the mixed diet or Artemia than in those that consumed the other diets. Pelleted feed produced the highest feeding rate but the poorest conversion rate. Fish fed pelleted feed consumed 143 mg/g/day, which was converted into 13 mg/g/day flesh. Those fed the  Artemia, earthworm, liver, or mixed diets consumed 46, 56, 89, and 84 mg/g/day, repectively, which were converted into 16, 18, 21, and 24 mg/g/day, respectively. The conversion rate dropped after parturition, possibly due to allocation of a major portion of the feed energy to development of gonads and young. Irrespective of feed type, gonads appeared on day 42. On day 84, the gonad weight of fish fed earthworms was 16 mg (wet weight), significantly (p


Raja James* and Kunchitham Sampath

Department of Zoology, V.O. Chidambaram College, Tuticorin 628 008, Tamilnadu, India

Published by

The Israeli Journal of Aquaculture – Bamidgeh 56(4), 2004, 264-273.

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