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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/48508

Title: 魚體大小及添加碳源對於尼羅吳郭魚—包心菜浮筏式魚菜共生系統的生產力及水質的影響
The Effects of Fish Size and Additional Carbon Source on the Productivity and Water Quality of Nile Tilapia (Oreochromis sp.) – White Cabbage (Brassica oleraceae var.) Raft Aquaponic System
Authors: Wilbur Francis Dubon
杜帆偉
Contributors: NTOU:Department of Aquaculture
國立臺灣海洋大學:水產養殖學系
Keywords: 魚菜共生;捲心菜;魚隻大小;糖蜜;尼羅吳郭魚
Aquaponics;cabbage;fish size;molasses;Nile tilapia
Date: 2015
Issue Date: 2018-08-22T06:05:35Z
Abstract: 本研究聚焦於測驗在魚菜共生系統可能叢生的兩個假說:1.較小的魚因為較快的新陳代謝及排謝,而提供較多的營養給植物,使魚隻及植物產量提升,2.類似在養殖系統中生物羽的作為,添加碳比不添加可造成較高的魚及植物之產量,以及較低的氨氮濃度。兩區集的試驗單位都包括三種大小的魚:小(9克)、中(16克)及大(41克),每大小皆有2重複。每一試驗單位都是一浮筏魚菜共生系統,具有近乎相同生物量的吳郭魚83克及甘藍菜74克,整個系統存在魚70升的桶中。保麗龍的浮筏種有6株甘藍。魚餵予含粗蛋白23%的商用飼料。每天投餵量在49天飼養期間從6%減至3%,均勻的分在早上10點及晚上8點投餵。廢醣漿的添加量是根據有多少的氮之輸入量及達到碳氮比20來估算出來,並第36、40、44及48天加在區集II做為碳源。試驗期間無魚或植物死亡。在兩區集小魚組都呈現最高的增重(產量151.1克)、增重率(180.39%)、比成長率(0.92)、蛋白質效率比(2.70)及最低的飼料轉換率(1.62)。魚體大小和有否加碳對於植物成長沒有影響。區集I(無添加醣漿)顯現較高的最終氨氮及磷酸濃度,但最低的生物羽量及pH。最重要的,添加碳並不會阻礙氨氮轉換成硝酸,且兩區集的失水平均一天1%。小魚較高的餵飼效用,可能因此在早期降低生產成本。已碳的添加可取代機械與生物過濾而維持適當的水質,並且可生產生物羽可作為魚的二階食物源。
This study focused on the test of two hypotheses that can occur in an aquaponic system. 1. Smaller fishes result in higher fish and plant production due to fast metabolism, and generation of waste nutrient for plants. 2. Carbon addition results in greater fish and plant production, and lower total ammonia nitrogen (TAN) levels than without, similar to what biofloc does in an aquaculture system. Two blocks (I and II) of experimental units, all were consisted of three fish sizes: small (9 g), medium (16 g) and large (41 g), each with two replicates. Rearing experiment was carried out for 49 days. Each experimental unit was a raft-aquaponic system, which accommodated similar biomass of tilapia (Oreochromis sp.), 83 g, and cabbage (Brassica oleraceae var. capitata L. f. alba), 74 g in a 70 L tank. Six plants of cabbage were fixed on styrofoam. Fish were fed a commercial tilapia feed containing 23% crude protein. Daily feed ration was decreased from 6% to 3% body weight over 49-days. Fish were fed evenly at 1000 h and 2000 h. Molasses was added as a carbon source to block II on days 36, 40, 44 and 48, based on nitrogen input, to attain a C/N ratio of 20. No fish or plants died. Small fishes exhibited highest weight gain (YIELD; 151.1 g), YIELD% (180.39 %), specific growth rate (0.92), protein efficiency ratio (2.70) and lowest feed conversion ratio (1.62) in both experimental blocks. Fish size and carbon addition had no effect on plant growth. Block I (no molasses added) exhibited higher final TAN and phosphate (PO43-) levels, but lower biofloc volume and pH. Importantly, carbon addition did not impede the conversion of TAN to NO3-, and water-loss in both blocks averaged 1% per day. Greater feeding efficiency of small fishes may therefore reduce production costs in the early stage. Finally, mechanical and biological filters can be substituted by carbon addition to maintain suitable water quality and produce biofloc, a secondary fish food source.
URI: http://ethesys.lib.ntou.edu.tw/cgi-bin/gs32/gsweb.cgi?o=dstdcdr&s=G0010233050.id
http://ntour.ntou.edu.tw:8080/ir/handle/987654321/48508
Appears in Collections:[水產養殖學系] 博碩士論文

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