碩士 / 國立臺灣海洋大學 / 水產養殖學系 / 93 / Two experiments were conducted on juvenile grouper Epinephelus coioides. Experiment 1 deal with the effects of feeding frequency, stocking density and fish size on growth and feeding behavior. The effect of feeding frequency, stocking density and fish size on body composition, growth, ammonia excretion, digestibility and feeding behavior were examined in experiment 2. Feeding frequency had positive effects on food consumption, growth and final size variation. Fish fed three times per day in both experiments showed better food consumption, but fed one meal per day in the 2nd experiment had better food conversion rate. In both experiments, fish size variation decreased with increasing feeding frequency and fish fed fewer meals per day tend to eat more per meal. Fish fed once daily had heavier stomach than from other groups. Fish fed three times daily had the highest body lipid content. Feeding frequency had no effect on apparent digestibility coefficient on grouper. Our result showed that a peak of ammonia excretion occurs 4 hours after the first feeding session. Increased feeding frequency to two or three lead to a cumulative effect of ammonia excretion. The low-density group had the highest food consumption as compared to medium and high densities in experiment 1. Fish stocked at high density had higher moisture content, stomachosomatic index, gut relative weight and condition factor. In experiment 1, the small size fish had higher size variation index compared to big size fish and had lower survival rate than medium and big fish. Our result indicated that fed three-time/ day for grouper grown from 10 to 30 g and one meal a day for the fish grown from 31 to 88 g, respectively and stocked at high density is recommended.
Keywords: feeding frequency; stocking density; fish size; growth; body composition; feeding behavior; grouper.
| Identifer | oai:union.ndltd.org:TW/093NTOU5086031 |
| Date | January 2005 |
| Creators | Mouhamadou Amadou LY, 李茂達 |
| Contributors | Liou Chyng-Hwa, 劉擎華 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | en_US |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 89 |
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