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Growth of Epinephelus coioides in recirculating system and under salinity fluctuation
|Contributors: ||NTOU:Department of Aquaculture|
Epinelus coicoides;recirculation;survival;growth;fullness;food conversion ratio;size variation
|Issue Date: ||2011-06-30T08:50:09Z
|Abstract: ||本論文研究點帶石斑養殖於室內循環式系統及在鹽度變動下之存活率、成長、豐滿度(fullness)、飼料轉換率(food conversion ratio)、大小變動系數(size variation)。 點帶石斑魚(體長12.9±0.12cm、體重33.01±1.22 g)養殖於室內循環系統內，餵食鰻魚飼料89天，體長及體重分別增至20.08±0.41cm與127.17±7.6 g。石斑魚體重、體長與攝食量隨養殖時間呈線性關係。魚的攝食量、大小變動係數隨時間增加而增加。體重(W) 體長(L)與關係為W=aLb，常數b介於2.6～3.5之間，平均3.06，豐滿度1.52～1.61；飼料轉換率0.83。 養殖在鹽度35‰之點帶石斑分別移至鹽度35‰ (對照組)、20‰及6‰，經1小時後再移回鹽度35‰。此實驗由鹽度35‰移至20‰以及由鹽度35‰移至6‰者，有3種處理頻率，分別為每24小時重複1次，每48小時重複1次及每96小時重複1次，鹽度35‰移至35‰處理頻率為每24小時重複一次，共7組，重複此鹽度變動過程，養殖89天。結果發現點帶石斑在此過程中全部活存。豐滿度在1.45～1.54之間，飼料轉換率在0.81～0.87之間，增重率在211～285%之間，且各組間無顯著差異。石斑魚養殖在鹽度35‰移至鹽度20及6‰，經1小時後移回鹽度35‰，其增重率較對照組小。石斑魚由鹽度35‰移至6‰，處理1小時，每48重複1次，大小變動係數最小(27.92﹪)，由鹽度35‰移至20‰，處理1小時，每48小時重複1次，大小變動係數最大(129.01﹪)。本實驗證實石斑魚在循環水系統之成長以及經反覆低鹽度下成長差異。|
This study is to deal with the survival, growth, fullness, and food conversion ratio of grouper Epinelus coicoides reared in a recirculation and under salinity fluctuation. Grouper with initial weight and length of 33.01±1.22 g and 12.9±0.12 cm reared in a recirculation system grew to 127.17±7.6 g and 20.08±0.41 cm, respectively. Growth of grouper increased directly with elapsed time. Daily feeding amount and size variation of grouper increased directly with elapsed time. Relationship between weight (W) and length (L) was established in an equation of W=aLb. with b between 2.6~3.5. The fullness and FCR of grouper was 1.52~1.61 and 0.83, respectively. Grouper that reared in salinity 35‰ were transferred to 20‰ and 6‰ for one-hour treatment and then shifted back to salinity 35‰ with three treatment plans (each with 24, 48 and 96 h). Grouper that reared in salinity 35‰ then transferred to 35‰ for one-hour treatment each every 24 h were served as control. This process repeated continuously for 87 days. Result indicated that all grouper survived. The fullness, FCR and percentage weight gain was 1.45~1.54, 0.81~0.87, and 211~285%, respectively. The percentage weight gain of grouper which had been reared at 35%, transferred to salinity 20 and 6% after one hour, and then transferred back to 35‰ was much lower than that of control grouper. The size variation of grouper which had been reared at 35‰, transferred to 6‰ for one hour, and then transferred back to 35 ‰ with continuous this process for 48 times was smaller (27.92%). However, the size variation of grouper which had been reared at 35‰, transferred to 20‰ for one hour, and then transferred back to 35‰ was higher (129.01%). This study demonstrated the growth of grouper in a recirculation system, and growth variation of grouper under repeated and continuous low salinity and high salinity stresses.
|Appears in Collections:||[水產養殖學系] 博碩士論文|
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