碩士 / 國立臺灣海洋大學 / 水產養殖學系 / 98 / The objective of this study was to investigate the effect of different stocking density and feed on the growth, survival and gonad somatic index of sea urchin Anthocidaris crassispina and Tripneustes gratilla in two cultivated systems. Four different experiments were conducted.
Experiment I was a 3x2 (density x diet) completely crossed design. Sea urchins Anthocidaris crassispina (average weight 70 g) were reared in plane cultivated system for 3 months at stocking density of 20(1.44 kg), 40(2.88 kg) and 60(4.32 kg) sea urchins per m2, respectively. They were fed Gracilaria sp. and artificial diets. The result showed sea urchins fed artificial diets at stocking density of 40(2.88 kg) per m2 had the highest weight gain(5.47±1.39%) among all treatments. Those fed artificial diets at stocking density of 60(4.32 kg) per m2 had the lowest weight gain(0.95±0.15%); while sea urchins fed artificial diets at stocking density of 60(4.32 kg) per m2 had significantly lower gonad somatic index(9.49±0.63%) compared to other treatments (11.91±0.52– 12.48±0.38%). In terms of diet, whether fed Gracilaria sp. or artificial diets, the weight gain and gonad somatic index had no significant differeces. In terms of density, sea urchins stocked at 40(2.88 kg) per m2 had significant higher weight gain, stocking density at 20(1.44 kg) and 40(2.88 kg) per m2 had significant higher gonad somatic index compared treatment at density at 60(4.32 kg) per m2. The survival rate was above 85% in all treatments.
Experiment II was a 3x2 (density x diet) completely crossed design. Sea urchins Anthocidaris crassispina (average weight 34 g) were reared in tier cultivated system for 3 months at stocking density of 20(0.68 kg), 40(1.36 kg) and 60(2.04 kg) sea urchins per m2, respectively. They were fed Gracilaria sp. and artificial diets. The result showed all treatments had no significant differences in weight gain (9.72±2.28–14.07±4.27%), whereas gonad somatic index in the groups fed artificial diets (10.34±1.65–10.80±2.37%) was significantly higher compared to the groups that fed Gracilaria sp. (5.69±1.23–6.19±0.22%). In terms of diet, whether fed Gracilaria sp. or artificial diets, the weight gain had no significant differeces, whereas fed artificial diets had significant higher gonad somatic index. In terms of density, there were no significant differences in weight gain as well as in gonad somatic index among all treatments. The survival rate was above 90% in all treatments.
Experiment III was a 3x2 (density x diet) completely crossed design. Sea urchins Tripneustes gratilla (average weight 140 g) were reared in plane cultivated system for 7 weeks at stocking density of 12(1.71 kg), 24(3.42 kg) and 36(5.13 kg) sea urchins per m2, respectively. They were fed Gracilaria sp. and artificial diets. The result showed the weight gain in the groups fed artificial diets (15.71±2.95–23.08±2.71%) was significantly higher conpared to the groups that fed Gracilaria sp. (1.51±6.28– 3.24±0.72%), the weight gain had no significant differences in all densities that fed Gracilaria sp., whereas the weight gain decreased when the stocking density increases in sea urchins fed artificial diets. The gonad somatic index in the groups fed artificial diets (5.74±1.49–6.48±0.23%) were significantly higher than the groups fed Gracilaria sp. (1.38±0.19–2.60±1.22%). In terms of diet, fed artificial diets had significant higher weight gain and gonad somatic index. In terms of density, there were no significant differeces in weight gain and gonad somatic index. The survival rate was above 85% in all treatments.
Experiment IV was a 3x2 (density x diet) completely crossed design. Sea urchins Tripneustes gratilla (average weight 140 g) were reared in tier cultivated system for 7 weeks at stocking density of 12(1.86 kg), 24(3.72 kg) and 36(5.58 kg) sea urchins per m2, respectively. They were fed Gracilaria sp. and artificial diets. The result showed the weight gain in the groups fed artificial diets (10.48±1.59–16.65±6.89%) was significantly higher than the groups that fed Gracilaria sp. (2.55±0.65–3.98±1.74%), the gonad somatic index in the groups fed artificial diets (11.04±1.89– 12.76±1.13%) were significantly higher than the groups fed Gracilaria sp. (6.51±1.39–9.72±1.38%). In terms of diet, fed artificial diets had significant higher weight gain and gonad somatic index. In terms of density, there were no significant differences in weight gain, however the gonad somatic index in 3.72 kg per m2 was significantly higher than 5.58 kg per m2. The survival rate was above 85% in all treatments.
| Identifer | oai:union.ndltd.org:TW/098NTOU5086113 |
| Date | January 2010 |
| Creators | Chen-Wen Li, 李鎮文 |
| Contributors | Shyn-Shin Sheen, 沈士新 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 110 |
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