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http://scholars.ntou.edu.tw/handle/123456789/202
2024-03-25T04:38:42ZThe epidemiologic triads in aquaculture: host, pathogen and environment
http://scholars.ntou.edu.tw/handle/123456789/24695
標題: The epidemiologic triads in aquaculture: host, pathogen and environment
作者: Chong, Chou Min; Lee, Po-Tsang; Rakus, Krzysztof; Wangkahart, Eakapol2023-01-01T00:00:00ZCultivation of Brackish Water Microalgae for Pig Manure Liquid Digestate Recycling
http://scholars.ntou.edu.tw/handle/123456789/24683
標題: Cultivation of Brackish Water Microalgae for Pig Manure Liquid Digestate Recycling
作者: Chang, Yung-Cheng; Pan, Yen-Ju; Huang, Tzu-Hsuan; Hsiao, Ting-Hsun; Wei, Liang-Yu; Hsu, Te-Hua
摘要: Sustainability and recycling of agricultural and animal husbandry waste are important. Pig manure contains relatively high concentrations of organic matter, such as nitrate-nitrogen, ammonia nitrogen, and phosphate, and a direct discharge can cause environmental pollution. This study successfully culturing four brackish water microalgae, including Tetraselmis chuii, Isochrysis galbana, Chlorella vulgaris, and Proteomonas sulcata, by using a diluted digestate solution of pig manure (NH3 concentration is lower than 10 mg/L). These microalgae can reach their highest cell concentration within 3-7 days of cultivation. The small microalgae, C. vulgaris and I. galbana, reached a cell density of 2.5 x 107 and 1.5 x 107, respectively, whereas lower cell densities were documented for large microalgae T. chuii (1.4 x 106) and P. sulcata (1.6 x 106). Our findings highlight the feasibility of sustainable treatment of animal manure using brackish water microalgae. These results provide opportunities to reduce freshwater usage and environmental pollutions, and support microalgae production for further aquaculture application.2023-01-01T00:00:00ZEffects of a free amino acid mixture in replacing dietary fishmeal and reducing Nile tilapia<i> (Oreochromis</i><i> niloticus)</i> production costs
http://scholars.ntou.edu.tw/handle/123456789/24666
標題: Effects of a free amino acid mixture in replacing dietary fishmeal and reducing Nile tilapia<i> (Oreochromis</i><i> niloticus)</i> production costs
作者: Wangkahart, Eakapol; Kersante, Pierrick; Phudkliang, Janjira; Nontasan, Supap; Pholchamat, Sirinya; Sunthamala, Phitcharat; Lee, Po-Tsang; Chantiratikul, Anut; Soonngam, Luxsanawadee; Pakdeenarong, Noppakun
摘要: To encourage aquaculture sustainability and lower fish production costs, fish products need to be substituted with sustainable ingredients in aquafeeds. Toward this goal, we examined whether a natural mix of highly concentrated free amino acids could alleviate the negative effects of low-fish meal (FM) diets on Nile tilapia in terms of growth performance and nutrient utilization. In the present study, a 2 x 3 factorial design with two FM levels (5 % and 10 %) was used to prepare the experimental diets and three levels of Kera-Stim (R) 50 (KS), a free amino acid mixture, was supplemented (0 %, 0.25 %, and 0.5 %). Nile tilapia fish (average initial body weight of 20 g) were cultured in 18 cages and provided with one of the six diets for eight weeks. We found that dietary KS supplementation significantly increased the growth performance parameters including final body weight, weight gain, and specific growth rate compared with the diets without KS supplementation (P < 0.05). Moreover, KS supplementation had a substantial positive effect on the feed conversion ratio (P < 0.05). Interestingly, not only the low-FM diets but also the diets supplemented with KS had a positive effect on the economic conversion ratio and economic profit index, suggesting increased economic efficiency. Furthermore, lysozyme, catalase, superoxide dismutase, glutathione peroxidase, and glutathione reductase activity levels were significantly increased by supplementing low-FM diets with KS (P < 0.05). KS and low-FM diets increased the whole-body levels of ash, fat, and crude protein (P < 0.05). Moreover, KS supplementation increased the levels of polyunsaturated fatty acids, such as arachidonic acid (20:4 n6) and docosahexaenoic acid (C22:6 n3). We concluded that supplementing a natural free amino acid mix to a low-FM diet can mitigate negative nutritional effects and achieve optimum fish performance without compromising growth performance or revenue-to-cost ratios.2023-01-01T00:00:00ZEffects of temperature and microalgal diet on the fecundity, population growth and fatty acid composition of<i> Pseudodiaptomus</i><i> ishigakiensis</i> (Calanoid, Copepoda)
http://scholars.ntou.edu.tw/handle/123456789/24667
標題: Effects of temperature and microalgal diet on the fecundity, population growth and fatty acid composition of<i> Pseudodiaptomus</i><i> ishigakiensis</i> (Calanoid, Copepoda)
作者: Paul, Bwaraniko; Chang, Yung-Cheng; Lin, Yi-Yang; Hsu, Te-Hua; Pan, Yen-Ju
摘要: This study aims to investigate the optimal culture conditions of the marine calanoid copepod Pseudodiaptomus ishigakiensis, which is considered emerging live feed for marine larviculture. The effects of temperatures (20 degrees C, 25 degrees C, 30 degrees C and 35 degrees C) and microalgal diets Isochrysis galbana (ISO), Proteomonas sulcata (PRO), Chlorella sp. (CHL) and Tetraselmis chuii (TET) on the fecundity, population growth rate, composition of developmental stages and fatty acid composition of P. ishigakiensis were evaluated. The highest population growth rate (60.6 +/- 4.9 ind./day) was found at 30 degrees C with the significantly-highest number of naupliar individuals (726.7 +/- 30.6 ind.) and a high level of fecundity (14.4 +/- 0.7 eggs/female). Whereas the lowest population growth was found at 35 degrees C (0.4 +/- 0.2 ind./day). In the diet experiment, the population growth rate (73.8 +/- 1.9 ind./day) was the highest in the PRO treatment with a great number of naupliar individuals (912.50 +/- 24.7 ind.) and fecundity (13.4 +/- 0.6 eggs/female). Both TET and CHL treatments showed the lowest population growth (0.5 +/- 0.1 ind./day and 0.2 +/- 0.1 ind./day, respectively) and absence of ovigerous female at the end of experiment, which indicated their unsuitability as feeds for P. ishigakiensis. Fatty acid compositions of copepods were affected by the fatty acid content of their microalgal diets. The copepods fed on ISO and PRO contained higher levels of eicosapentaenoic acid (EPA, C20:5 n-3; 4.51 +/- 1.29-5.42 +/- 0.64%) and docosahexaenoic acid (DHA, C22:6 n-3; 4.00 +/- 0.34-5.92 +/- 1.28%) composition compared to CHL and TET (EPA: 0.48 +/- 0.15-2.65 +/- 1.27%; DHA: 1.68 +/- 0.26-1.89 +/- 0.14%). This study revealed the optimal culture conditions and nutritional value of the copepod P. ishigakiensis, which provides implications for the managements of their mass culture, and utilization in marine larviculture.2023-01-01T00:00:00Z