Pub Date : 2021-03-02DOI: 10.20944/PREPRINTS202103.0075.V1
Ashikur Rahman, S. H. T. Shefat, M. A. Chowdhury
Aquaculture is one of the fastest-growing animal food-producing agricultural industries in the world and proper performance of fish in morphological, physiological and immunological aspects is important for fish production and sustainable expansion of aquaculture. But several inhibitors like disease, pathogen, and adverse environment can overpower these performances. At present, antibiotics in preventing these inhibitors have been seen as becoming favorable to those inhibitors. So, Bacillus, an important group of probiotic bacteria can be an alternative to these antibiotics in aquaculture. Bacillus has been seen used in different experiments, mainly as a supplement in feed at various concentrations. Bacillus showed effective results like improved growth with minimum cost, improvement in reproduction, hematology, improved immune response and disease, and stress resistance as well as better proximate composition in different fish species. Application of Bacillus strains has proven efficient in improving water quality by reducing ammonia and nitrite toxicity, harmful algal blooms and utilization of H+ ion. Larger application of probiotic Bacillus instead of the hazardous synthetic chemicals would promote eco-friendly low-input sustainable aquaculture for food and nutritional security of the increasing world population. So many more experiments should be conducted in commercially important fishes for better growth and health of fishes which will certainly increase fish
{"title":"Effects of Probiotic Bacillus on Growth Performance, Immune Response and Disease Resistance in Aquaculture","authors":"Ashikur Rahman, S. H. T. Shefat, M. A. Chowdhury","doi":"10.20944/PREPRINTS202103.0075.V1","DOIUrl":"https://doi.org/10.20944/PREPRINTS202103.0075.V1","url":null,"abstract":"Aquaculture is one of the fastest-growing animal food-producing agricultural industries in the world and proper performance of fish in morphological, physiological and immunological aspects is important for fish production and sustainable expansion of aquaculture. But several inhibitors like disease, pathogen, and adverse environment can overpower these performances. At present, antibiotics in preventing these inhibitors have been seen as becoming favorable to those inhibitors. So, Bacillus, an important group of probiotic bacteria can be an alternative to these antibiotics in aquaculture. Bacillus has been seen used in different experiments, mainly as a supplement in feed at various concentrations. Bacillus showed effective results like improved growth with minimum cost, improvement in reproduction, hematology, improved immune response and disease, and stress resistance as well as better proximate composition in different fish species. Application of Bacillus strains has proven efficient in improving water quality by reducing ammonia and nitrite toxicity, harmful algal blooms and utilization of H+ ion. Larger application of probiotic Bacillus instead of the hazardous synthetic chemicals would promote eco-friendly low-input sustainable aquaculture for food and nutritional security of the increasing world population. So many more experiments should be conducted in commercially important fishes for better growth and health of fishes which will certainly increase fish","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":"41 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2021-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81282960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.35248/2155-9546.21.12.643
M. Wijekoon, Parrish Cc, A. Mansour
The effect of fluctuating temperature on muscle lipid composition was examined in 1.8 Kg steelhead trout fed 3 commercial diets with varying proportions (16.5 - 31% total) of Σω3 fatty acids and large differences (5×) in ω6:ω3 fatty acid ratios. Temperature was increased from 13.5°C to 18.0°C and then dropped back down to 13.5°C over a period of 12 weeks. Diet had no significant effect on growth or on total polyunsaturated fatty acid (PUFA) proportions in muscle tissue, but significant changes were observed in individual fatty acids. There was a greater response to changes in diet in the fatty acids than there was to changes in temperature. Muscle C20–C22 ω3PUFA and C18 unsaturated fatty acids reflected dietary inputs leading to very different (up to 40%) ω6:ω3 fatty acid ratios. Independent of diet, increasing temperature significantly increased total lipids and saturated fatty acids, especially 16:0, and decreased monounsaturated ones, especially 18:1ω9, as well as the PUFA 18:2ω6. The ω6:ω3 fatty acid ratio was also lowest at 18.0°C. Increasing total lipids, sterols and saturated fatty acids with increasing temperature, has important implications for both cultured and wild fish in terms of their nutrition, food quality for humans, and resource availability for aquafeeds.
{"title":"Effect of Growth Temperature on Muscle Lipid Class and Fatty Acid Composition in Adult Steelhead Trout (Oncorhynchus mykiss) Fed Commercial Diets with Different andomega;6 to andomega;3 Fatty Acid Ratios","authors":"M. Wijekoon, Parrish Cc, A. Mansour","doi":"10.35248/2155-9546.21.12.643","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.643","url":null,"abstract":"The effect of fluctuating temperature on muscle lipid composition was examined in 1.8 Kg steelhead trout fed 3 commercial diets with varying proportions (16.5 - 31% total) of Σω3 fatty acids and large differences (5×) in ω6:ω3 fatty acid ratios. Temperature was increased from 13.5°C to 18.0°C and then dropped back down to 13.5°C over a period of 12 weeks. Diet had no significant effect on growth or on total polyunsaturated fatty acid (PUFA) proportions in muscle tissue, but significant changes were observed in individual fatty acids. There was a greater response to changes in diet in the fatty acids than there was to changes in temperature. Muscle C20–C22 ω3PUFA and C18 unsaturated fatty acids reflected dietary inputs leading to very different (up to 40%) ω6:ω3 fatty acid ratios. Independent of diet, increasing temperature significantly increased total lipids and saturated fatty acids, especially 16:0, and decreased monounsaturated ones, especially 18:1ω9, as well as the PUFA 18:2ω6. The ω6:ω3 fatty acid ratio was also lowest at 18.0°C. Increasing total lipids, sterols and saturated fatty acids with increasing temperature, has important implications for both cultured and wild fish in terms of their nutrition, food quality for humans, and resource availability for aquafeeds.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":"6 1","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75072773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.35248/2155-9546.21.12.637
Kiki Wahyu Nilamsari, J. Hutabarat, D. Rachmawati, Bayu Prakoso Adi
Milkfish (Chanos chanos) is one of commodity which is strategic to fulfill necessity of protein that cheap enough and delighted by customer in Indonesian. The low feed efficiency is one of the obstacles in milkfish intensive farming. This can be overcome by the addition of the exogenous enzyme that an important role to digestion of feed, among exogenous enzyme is bromelain enzyme contained in pineapple extract. Enzyme bromelain is one of enzyme protease, which has the function to dissolve the protein with hydrolyzing of peptide in acid amino. This experiment has purpose to know the influence giving pineapple extract on artificial feed to feed utilization efficiency, growth, and survival rate of milkfish (C. chanos). Fish samples used 42-day old C. chanos with an average weight of 3.54 ± 0.03 g. This research used completely randomized experimental and design methods (RAL) with 4 treatments and 3 replications, respectively. The used treatments were treatment A (0 ml), B (2.5 ml), C (5 ml), and D (7.5 ml). The results showed that the proportion of pineapple extract was very significant influence (P 0.01) to Total Feed Consumed(TKP) and Survival Rate(SR). The optimum dose of pineapple extract is 4.50 ml can be Produce EPP maximum about 52.73%. The dose optimum pineapple extract about 4.26 ml can be produce per in maximum 1.55% and the optimum dose of pineapple extract 4.39 ml can produce RGR about 3.22%.
{"title":"Growth Performance and Survival Rates of Milkfish (Chanos chanos) Fed Diets Supplemented with Pineapple Extract.","authors":"Kiki Wahyu Nilamsari, J. Hutabarat, D. Rachmawati, Bayu Prakoso Adi","doi":"10.35248/2155-9546.21.12.637","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.637","url":null,"abstract":"Milkfish (Chanos chanos) is one of commodity which is strategic to fulfill necessity of protein that cheap enough and delighted by customer in Indonesian. The low feed efficiency is one of the obstacles in milkfish intensive farming. This can be overcome by the addition of the exogenous enzyme that an important role to digestion of feed, among exogenous enzyme is bromelain enzyme contained in pineapple extract. Enzyme bromelain is one of enzyme protease, which has the function to dissolve the protein with hydrolyzing of peptide in acid amino. This experiment has purpose to know the influence giving pineapple extract on artificial feed to feed utilization efficiency, growth, and survival rate of milkfish (C. chanos). Fish samples used 42-day old C. chanos with an average weight of 3.54 ± 0.03 g. This research used completely randomized experimental and design methods (RAL) with 4 treatments and 3 replications, respectively. The used treatments were treatment A (0 ml), B (2.5 ml), C (5 ml), and D (7.5 ml). The results showed that the proportion of pineapple extract was very significant influence (P 0.01) to Total Feed Consumed(TKP) and Survival Rate(SR). The optimum dose of pineapple extract is 4.50 ml can be Produce EPP maximum about 52.73%. The dose optimum pineapple extract about 4.26 ml can be produce per in maximum 1.55% and the optimum dose of pineapple extract 4.39 ml can produce RGR about 3.22%.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":"47 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88890993","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.35248/2155-9546.21.12.655
Rakshitha Kotha
{"title":"Combination of Aquaculture and Hydroponics","authors":"Rakshitha Kotha","doi":"10.35248/2155-9546.21.12.655","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.655","url":null,"abstract":"","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":"26 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83223705","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.35248/2155-9546.21.12.657
Rakshitha Kotha
{"title":"Nutrient Supplementation to Aquatic Species and their Metabolic Growth","authors":"Rakshitha Kotha","doi":"10.35248/2155-9546.21.12.657","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.657","url":null,"abstract":"","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":"52 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89028941","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.35248/2155-9546.21.12.656
Rakshitha Kotha
{"title":"Commercial Phase of Hatchery System","authors":"Rakshitha Kotha","doi":"10.35248/2155-9546.21.12.656","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.656","url":null,"abstract":"","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":"35 1","pages":"1-2"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89013359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.35248/2155-9546.21.12.648
Maria Lizanne Ac, Jeana Ida Rodrigues, Miriam Triny Fern, Es
A 60-day feeding experiment was conducted on Swordtail, Xiphophorus helleri to correlate the growth and the crude protein percentage of the feed. Nine experimental diets (Treatments) were formulated using different locally and cheaply available conventional and nonconventional protein sources keeping the basal ingredients same. These diets were tested on three replicate groups of 10 fishes (initial body weight: 0.7 ± 0.5 g) bred in circular fiber reinforced plastic tanks of 120 liter capacity with 100 liter of seasoned de-chlorinated tap water. Fishes were fed 3% of their body weight. The growth performance of Swordtail was studied in terms of Weight Gain, Feed Conversion Ratio (FCR), Specific Growth Rate (SGR%/day) and Protein Efficiency Ratio (PER). The results indicated that Weight Gain was more in the Treatment that contained Chicken Waste and least in the Treatment that contained Marine Fish Waste. Specific growth rate%/per day and Protein efficiency ratio showed similar results. The Feed conversion ratio was greater in Treatment that contained Marine Fish Waste and least in Treatment that contained Chicken Waste. The study suggests that Chicken Waste as a major source of Protein can be effectively considered in the formulation of practical diet for better growth of Swordtail, Xiphophorus helleri.
{"title":"Formulation of Diet Using Conventional and Non-Conventional Protein Sources","authors":"Maria Lizanne Ac, Jeana Ida Rodrigues, Miriam Triny Fern, Es","doi":"10.35248/2155-9546.21.12.648","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.648","url":null,"abstract":"A 60-day feeding experiment was conducted on Swordtail, Xiphophorus helleri to correlate the growth and the crude protein percentage of the feed. Nine experimental diets (Treatments) were formulated using different locally and cheaply available conventional and nonconventional protein sources keeping the basal ingredients same. These diets were tested on three replicate groups of 10 fishes (initial body weight: 0.7 ± 0.5 g) bred in circular fiber reinforced plastic tanks of 120 liter capacity with 100 liter of seasoned de-chlorinated tap water. Fishes were fed 3% of their body weight. The growth performance of Swordtail was studied in terms of Weight Gain, Feed Conversion Ratio (FCR), Specific Growth Rate (SGR%/day) and Protein Efficiency Ratio (PER). The results indicated that Weight Gain was more in the Treatment that contained Chicken Waste and least in the Treatment that contained Marine Fish Waste. Specific growth rate%/per day and Protein efficiency ratio showed similar results. The Feed conversion ratio was greater in Treatment that contained Marine Fish Waste and least in Treatment that contained Chicken Waste. The study suggests that Chicken Waste as a major source of Protein can be effectively considered in the formulation of practical diet for better growth of Swordtail, Xiphophorus helleri.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":"72 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90378615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.35248/2155-9546.21.12.646
S. Choudhary, S. Godika
Wilt of cumin incited by Fusarium oxysporum f. sp. cumini is one of the important disease and a big constraint in successful cultivation. Therefore, in the present study, 7 isolates of Fusarium oxysporum f. sp. cumini collected from different cumin growing areas of Rajasthan were assessed for morphological and pathogenic variations. The different isolates produced sickle shaped macro conidia and spores of varying width, length having variable number of septa. The isolate I2 produced highest length and number of septa in macro conidia. The length of macro conidia varied from 22.77 µm in isolate I3 to 29.65 µm in isolate I2 whereas, micro conidia length varied from 7.54 µm in I4 to 11.53 µm in I6. In study of pathogenic variability, among different isolate, the isolate I1 proved most virulent as it showed disease symptoms earliest whereas, isolate I5 proved least virulent.
小茴香枯萎病(Fusarium oxysporum f. sp. cumini)是小茴香的重要病害之一，也是成功栽培的一大制约因素。因此，本研究对从拉贾斯坦邦不同孜然种植区采集的7株枯镰刀菌进行了形态和致病变异分析。不同的分离株产生镰刀状的大分生孢子和孢子，孢子的宽度、长度和间隔数不等。分离物I2在大分生孢子中产生的间隔长度和数量最多。分离物I3的大分生孢子长度为22.77µm ~ 29.65µm，分离物I2的小分生孢子长度为7.54µm ~ 11.53µm。在致病变异性的研究中，不同的分离物中，分离物I1表现出最早的发病症状，毒力最强，而分离物I5表现出最低的毒力。
{"title":"Morphological and Pathogenic Variability in Different Isolates of Fusarium oxysporum f. sp. cumini","authors":"S. Choudhary, S. Godika","doi":"10.35248/2155-9546.21.12.646","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.646","url":null,"abstract":"Wilt of cumin incited by Fusarium oxysporum f. sp. cumini is one of the important disease and a big constraint in successful cultivation. Therefore, in the present study, 7 isolates of Fusarium oxysporum f. sp. cumini collected from different cumin growing areas of Rajasthan were assessed for morphological and pathogenic variations. The different isolates produced sickle shaped macro conidia and spores of varying width, length having variable number of septa. The isolate I2 produced highest length and number of septa in macro conidia. The length of macro conidia varied from 22.77 µm in isolate I3 to 29.65 µm in isolate I2 whereas, micro conidia length varied from 7.54 µm in I4 to 11.53 µm in I6. In study of pathogenic variability, among different isolate, the isolate I1 proved most virulent as it showed disease symptoms earliest whereas, isolate I5 proved least virulent.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":"444 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82890195","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.35248/2155-9546.21.12.645
KedirJemal, Mohammed Aliyi
Despite the importance of barely, there are several factors affecting its production. Among these inadequate uses of N fertilizer and lack of using improved food barley variety are the most important ones. A field experiment was conducted under rainy season conditions to investigate the effects of food barley varieties and rates of nitrogen fertilizer application in the combinations of three food barley varieties, namely Adoshe, Robera and Abdene and four levels of N (23 Kg N/ha , 46 Kg N/ha , 69 Kg N/ha and 92 Kg N/ha) arranged in randomized complete block design in factorial arrangement with three replications on vegetative growth, yield and yield components of barley ( Hordeum vulgare L.) at Kofele, Oromia Regional State of Ethiopia. Results indicated that different nitrogen fertilizer rate had a very highly significant (p 0.05). Moreover, barley phonological, growth, yield and yield components were highly significantly (p 0.05). the maximum and minimum mean values of grain yield production of barley were observed from Adoshe barley variety treated with 92 Kg ha-1 nitrogen fertilizer rate (6.01 tone /ha) and Robera barley variety treated with 23 Kg ha-1 nitrogen fertilizer rate (3.29 tone/ha), respectively. The partial budget analysis revealed that, maximum net benefit of Birr 99350.00 ha-1 with an acceptable marginal rate of returns (MRR) of 3348.23% with the treatment Adoshe variety with combination of 92 Kg N ha-1. However, the lowest net benefit of (Birr 55225.00 ha-1) was recorded from Robera barley variety treated with 23 Kg ha-1 nitrogen fertilizer rate. Therefore, Production of Adoshe variety with combination of 92 Kg N ha-1 was economical, and uncertainly recommended for production of food barley in the study area and other areas with similar agro-ecological condition.
尽管勉强的重要性，有几个因素影响它的生产。其中氮肥施用不足和改良食用大麦品种使用不足是最主要的原因。本试验在雨季条件下，采用随机完全区组设计，3个重复，研究了阿多施、罗伯A和阿伯丁3个食用大麦品种和4个N水平(23 Kg N/ha、46 Kg N/ha、69 Kg N/ha和92 Kg N/ha)组合施氮量对小麦营养生长的影响。埃塞俄比亚奥罗米亚州科菲勒地区大麦(Hordeum vulgare L.)的产量和产量组成部分。结果表明，不同施氮量对青枯病的影响极显著(p < 0.05)。此外，大麦的音系、生长、产量和产量组成均极显著(p 0.05)。92 Kg hm -1施氮量(6.01吨/公顷)处理的阿多什和23 Kg hm -1施氮量(3.29吨/公顷)处理的大麦籽粒产量均值最高和最小。局部预算分析结果表明，与阿多什品种配合92 Kg N ha-1处理，Birr 99350.00 ha-1的最大净效益为3348.23%，可接受边际收益率为3348.23%。而施氮量为23 Kg hm -1的罗伯大麦品种(Birr 55225.00 hm -1)的净效益最低。因此，92 Kg N / hm -1组合生产阿多舍品种是经济的，不确定推荐用于研究区和其他类似农业生态条件的地区生产食用大麦。
{"title":"Growth and Yield Response of Food Barley (Hordeum vulgare L.) Varieties to Nitrogen Fertilizer Rates Inkofele District, Southeastern Oromia","authors":"KedirJemal, Mohammed Aliyi","doi":"10.35248/2155-9546.21.12.645","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.645","url":null,"abstract":"Despite the importance of barely, there are several factors affecting its production. Among these inadequate uses of N fertilizer and lack of using improved food barley variety are the most important ones. A field experiment was conducted under rainy season conditions to investigate the effects of food barley varieties and rates of nitrogen fertilizer application in the combinations of three food barley varieties, namely Adoshe, Robera and Abdene and four levels of N (23 Kg N/ha , 46 Kg N/ha , 69 Kg N/ha and 92 Kg N/ha) arranged in randomized complete block design in factorial arrangement with three replications on vegetative growth, yield and yield components of barley ( Hordeum vulgare L.) at Kofele, Oromia Regional State of Ethiopia. Results indicated that different nitrogen fertilizer rate had a very highly significant (p 0.05). Moreover, barley phonological, growth, yield and yield components were highly significantly (p 0.05). the maximum and minimum mean values of grain yield production of barley were observed from Adoshe barley variety treated with 92 Kg ha-1 nitrogen fertilizer rate (6.01 tone /ha) and Robera barley variety treated with 23 Kg ha-1 nitrogen fertilizer rate (3.29 tone/ha), respectively. The partial budget analysis revealed that, maximum net benefit of Birr 99350.00 ha-1 with an acceptable marginal rate of returns (MRR) of 3348.23% with the treatment Adoshe variety with combination of 92 Kg N ha-1. However, the lowest net benefit of (Birr 55225.00 ha-1) was recorded from Robera barley variety treated with 23 Kg ha-1 nitrogen fertilizer rate. Therefore, Production of Adoshe variety with combination of 92 Kg N ha-1 was economical, and uncertainly recommended for production of food barley in the study area and other areas with similar agro-ecological condition.","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":"27 1","pages":"1-12"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80733014","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-01-01DOI: 10.35248/2155-9546.21.12.653
Rakshitha Kotha
{"title":"Nursery Rearing and Seed Stocking of Silver Pompano","authors":"Rakshitha Kotha","doi":"10.35248/2155-9546.21.12.653","DOIUrl":"https://doi.org/10.35248/2155-9546.21.12.653","url":null,"abstract":"","PeriodicalId":15243,"journal":{"name":"Journal of Aquaculture Research and Development","volume":"103 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80767543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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