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Effect of red algal bloom on growth and production of carps 红藻华对鲤鱼生长和生产的影响
Our Nature Pub Date : 2018-12-31 DOI: 10.3126/on.v16i1.22122
R. Mandal, S. Rai, M. Shrestha, D. Jha, N. Pandit
{"title":"Effect of red algal bloom on growth and production of carps","authors":"R. Mandal, S. Rai, M. Shrestha, D. Jha, N. Pandit","doi":"10.3126/on.v16i1.22122","DOIUrl":"https://doi.org/10.3126/on.v16i1.22122","url":null,"abstract":"An experiment was carried to assess the effect of red algal bloom on growth and production of carp, water quality and profit from carp for 120 days at Aquaculture Farm of Agriculture and Forestry University, Chitwan. The experiment included two treatments: carp polyculture in non-red pond and carp polyculture in red pond with algal bloom each with three replicates. Carp fingerlings were stocked at 1 fish/m2 and fed with pellet containing 24% CP at 3% body weight. Net yield of rohu was found significantly higher (p<0.05) in non-red ponds (0.38±0.01 t ha-1) than red ponds (0.24±0.05 t ha-1). Survival of rohu (84.9±1.4%), bighead (95.2±2.0%) and mrigal (88.1±14.4%) were also significantly higher (p<0.05) in non-red ponds than red ponds. Red algal bloom affected DO, nitrate and chlorophyll-a, nitrite, total nitrogen, total phosphorus, total dissolved solids and conductivity. However, overall carp production and profit from carp remained unaffected.","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"31 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90436935","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}
引用次数: 4
Conservation value of Beeshhazari Lake: an insight into diversity and abundance of wetland birds 比沙扎里湖的保护价值:湿地鸟类的多样性和丰富性
Our Nature Pub Date : 2018-12-31 DOI: 10.3126/ON.V16I1.21563
J. Adhikari, B. Bhattarai, D. Dhakal
{"title":"Conservation value of Beeshhazari Lake: an insight into diversity and abundance of wetland birds","authors":"J. Adhikari, B. Bhattarai, D. Dhakal","doi":"10.3126/ON.V16I1.21563","DOIUrl":"https://doi.org/10.3126/ON.V16I1.21563","url":null,"abstract":"Beeshazari and associated lakes play the vital roles in providing feeding and breeding grounds for a large number of wetland fauna including many migratory birds. Wetland dependent birds in Beeshazari lake system was studied by using Area Search and Scan Sampling methods. We recorded a total of 44 wetland bird species belonging to 11 families and 9 orders. These lakes support a total of 7.5% of globally threatened and 8.93% of the nationally threatened birds. The species diversity and abundance were more in winter than in summer seasons. Fishermen and tourist pressure caused significantly negative impact on abundance and distribution of wetland birds. The major threats to wetland birds in this area were human disturbance, habitat degradation and declining water quality due to eutrophication and invasion of alien plant species such as water Hyacinth and Southern Cutgrass. Therefore, such threats need to be addressed for the long-term survival of wetland birds and extension of conservation value of Beeshazari lake system.","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77797983","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}
引用次数: 4
Substitution of chemical fertilizer nitrogen through Rhizobium inoculation technology 根瘤菌接种技术替代化肥氮
Our Nature Pub Date : 2018-12-31 DOI: 10.3126/ON.V16I1.22121
Som Prasad Paudyal, V. Gupta
{"title":"Substitution of chemical fertilizer nitrogen through Rhizobium inoculation technology","authors":"Som Prasad Paudyal, V. Gupta","doi":"10.3126/ON.V16I1.22121","DOIUrl":"https://doi.org/10.3126/ON.V16I1.22121","url":null,"abstract":"Nitrogen is one of the most essential elements for plants growth and development. Urea is commonly used as a substitute for chemical nitrogen. Rhizobium inoculation technology for legume crop was evaluated in a number of field experiments comparing with 80kg urea per hectare application. The inoculation and urea application trial showed almost similar biomass accumulation, nodule number and nodule dry weight compared to un-inoculated control. The symbiotic effectiveness with inoculated and urea application showed similar results. The inoculant strains isolated locally from Mucuna pruriens (velvet bean) were found suitable for inoculants production. The bio-technology of inoculation can be a promising and cheap alternative of urea for the legume crops.","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"35 2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77541380","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}
引用次数: 6
Response of mass selection in maize (Zea mays L.) 玉米(Zea mays L.)群体选择反应
Our Nature Pub Date : 2018-12-31 DOI: 10.3126/ON.V16I1.22119
J. Shrestha, C. B. Kunwar, B. Bhandari
{"title":"Response of mass selection in maize (Zea mays L.)","authors":"J. Shrestha, C. B. Kunwar, B. Bhandari","doi":"10.3126/ON.V16I1.22119","DOIUrl":"https://doi.org/10.3126/ON.V16I1.22119","url":null,"abstract":"This study was conducted to quantify the progress towards grain yield and agronomic traits in maize genotypes through mass selection. The original maize population and the population derived after five cycles of mass selection were planted for comparison at research field of National Maize Research Program, Rampur, Chitwan, Nepal during winter season of 2011-2012. The maize genotypes were Arun-1EV, Arun-4, Pool-17, P501SRCO × P502SRCO, BGBYPOP, Across9942 × Across9944, S99TLYQ-B, S99TLYQ-AB and S01SIWQ-3, respectively. The experiment was laid down in randomized complete block design with three replications. Each replication consisted of 180 rows; 20 rows of each genotypes. The results showed that there was significant reduction in plant height, ear height, tasseling days, silking days, disease severity however significant increment in grain yield. The results showed that phenotypic superiority of the selected population over the original population was obvious.","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91122499","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}
引用次数: 3
Variation in carbon stock in litterfall, fine root and soil in Sal (Shorea robusta Gaertn.) forests of eastern Nepal 尼泊尔东部萨尔(Shorea robusta Gaertn.)森林凋落物、细根和土壤碳储量变化
Our Nature Pub Date : 2018-12-31 DOI: 10.3126/ON.V16I1.22124
K. Bhattarai, T. Mandal
{"title":"Variation in carbon stock in litterfall, fine root and soil in Sal (Shorea robusta Gaertn.) forests of eastern Nepal","authors":"K. Bhattarai, T. Mandal","doi":"10.3126/ON.V16I1.22124","DOIUrl":"https://doi.org/10.3126/ON.V16I1.22124","url":null,"abstract":"Global climate change is a major problem generated by increasing concentration of carbon dioxide in the atmosphere. Forests and their soils are major sink of carbon and thus constitute an effective role in the global carbon cycle. Present study was conducted to quantify and compare the amount of carbon stock in litterfall, fine root and soil between Tarai Sal forest and Hill Sal forest of eastern Nepal. Carbon stock in litter and fine root was estimated by ash content method and in soil by multiplying the value of soil organic carbon, bulk density and soil depth. Carbon stock in litterfall was higher (3.94 Mg ha-1) in TSF than HSF (3.26 Mg ha-1) and in fine root (0-5 mm size) in 0-30 cm soil depth it was higher in HSF (2.76 Mg ha-1) than TSF (2.19 Mg ha-1). In soil (0-30 cm depth) the value was higher in HSF (58.23 Mg ha-1) than TSF (50.81Mg ha-1). Tarai Sal forest accumulated higher carbon stock in the litterfall and lower in fine root than Hill Sal forest which was mainly attributed to the amount of litterfall and fine root biomass rather than organic carbon concentration. In Tarai Sal forest the carbon stock in soil was relatively low than Hill Sal forest that may be due to the higher net uptake and mineralization of carbon in the situation of higher growth rate of plant. These outcomes verified that the forest plays important role for mitigation of global warming by storing the atmospheric carbon dioxide in plant parts and the soil. So, it concludes that conserving the considerable quantity of carbon in forests is inevitable for proper forest management.","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87104539","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}
引用次数: 5
Relative condition factor, length-weight relationship and sex ratio of copper mahseer, Neolissochilus hexagonolepis (McClelland, 1839) from Tamor River, Nepal 尼泊尔塔莫尔河Neolissochilus hexonolepis (McClelland, 1839)的相对条件因子、长重关系和性别比
Our Nature Pub Date : 2018-12-31 DOI: 10.3126/ON.V16I1.21569
S. Subba, B. R. Subba, V. K. Mahaseth
{"title":"Relative condition factor, length-weight relationship and sex ratio of copper mahseer, Neolissochilus hexagonolepis (McClelland, 1839) from Tamor River, Nepal","authors":"S. Subba, B. R. Subba, V. K. Mahaseth","doi":"10.3126/ON.V16I1.21569","DOIUrl":"https://doi.org/10.3126/ON.V16I1.21569","url":null,"abstract":"The present investigation was carried out for establishing the length weight relationship and to enumerate the relative condition factor and the sex ratio of Neolissochilus hexagonolepis from Tamor River, Nepal. Altogether 198 fishes were investigated from December 2014 till the end of November 2016. The sex ratio of the fish was found to be in the ratio of 1:1.2 with female dominating the catch for most parts of the year. Analysis of t-test showed a highly significant relationship (p˂0.05) between length and weight for male, female and sexes pooled. The fish was found to show isometric growth pattern with exponential value (b) equal to 2.962 for sexes pooled. The mean value of Fulton's condition factor (K) for sexes pooled was found to be 1.29 ± 0.49 giving the indication that the general well being of the fish was good. Sudden increase in the value of relative condition factor (Kn) in the size group 30-33 cm in male and 42-45 cm in female indicated their length range during which they showed the sign of maturation for the first time. Steep fall in the value of 'Kn' in size groups 33-36 cm onwards in male and 45-48 cm in female indicated their length range at spent phase.","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"50 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89775007","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}
引用次数: 3
Ichthyo-faunal diversity of Morang district, Nepal 尼泊尔莫朗地区的鱼类-动物多样性
Our Nature Pub Date : 2017-12-25 DOI: 10.3126/ON.V15I1-2.18794
B. R. Subba, N. Pokharel, M. Pandey
{"title":"Ichthyo-faunal diversity of Morang district, Nepal","authors":"B. R. Subba, N. Pokharel, M. Pandey","doi":"10.3126/ON.V15I1-2.18794","DOIUrl":"https://doi.org/10.3126/ON.V15I1-2.18794","url":null,"abstract":"The present paper attempts to report a total of 118 fish species spread over 11 orders, 26 families and 64 genera inhabited indifferent water bodies viz, rivers, reservoirs, streams, ponds, lakes, canals, ditches, paddy fields of Morang district, collected during a one-year survey. The order Cypriniformes is the richest one among 11 orders that comprises 59 species followed by Siluriformes having 31 and Perciformes with 19 representatives, respectively. Orders Anguilliformes, Osteoglossiformes, Beloniformes, Cyprinodontiformes, Synbranchiformes and Tetraodontiformes have only one representative. Olyra longicaudata is the new report from Morang district and the second report from Nepal. Besides this, other hill-stream fishes viz ., Pseudecheneis sulcatus, Schizothorax plagiostomus, Schistura savona and Neolissochilus hexagonolepis recorded during the survey, also have not been previously reported from this district.","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"17 1","pages":"55-67"},"PeriodicalIF":0.0,"publicationDate":"2017-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78359686","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}
引用次数: 17
Evaluation of bacteriological parameters and heavy metal contents on water of Tinau river, Butwal, Rupandehi, Nepal 尼泊尔鲁潘代伊布瓦尔市提瑙河水质细菌参数及重金属含量评价
Our Nature Pub Date : 2017-12-25 DOI: 10.3126/ON.V15I1-2.18787
B. Pandey, A. Devkota
{"title":"Evaluation of bacteriological parameters and heavy metal contents on water of Tinau river, Butwal, Rupandehi, Nepal","authors":"B. Pandey, A. Devkota","doi":"10.3126/ON.V15I1-2.18787","DOIUrl":"https://doi.org/10.3126/ON.V15I1-2.18787","url":null,"abstract":"The present work was undertaken to assess the surface water quality and discuss the potability of water by analyzed data of bacteriological (total Coliform and Faecalform) characters and heavy metals content (Fe, Mn, Zn, Pb, Cr and Cu) in the water of Tinau river. The study was carried out in the year 2011/2012 by selecting four spots within three different seasons: winter, summer and rainy. For bacterial enumeration, bacterial plate counts were carried out using the pour plate method with nutrient agar; while for determination of heavy metal concentration, Flame Atomic Absorption Spectro-photometry was used. The heavy metal content was within the range of WHO guideline for drinking purpose. However, on the basis of bacteriological parameters the water was not safe to consume without treatment. This study will also help to make aware those local people or adjacent farmers for proper management of waste disposal and also to minimize use of synthetic inputs.","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"1 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88586345","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}
引用次数: 0
ELISA validation and determination of cut-off level for chloramphenicol (CAP) residues in shrimp and fish 虾和鱼中氯霉素(CAP)残留量的酶联免疫吸附试验验证及测定
Our Nature Pub Date : 2017-12-25 DOI: 10.3126/ON.V15I1-2.18789
M. G. Sarwer, Md. Mahmudul Hasan Rony, Mst. S. Sharmin, A. Chowdhury, S. Bhowmik
{"title":"ELISA validation and determination of cut-off level for chloramphenicol (CAP) residues in shrimp and fish","authors":"M. G. Sarwer, Md. Mahmudul Hasan Rony, Mst. S. Sharmin, A. Chowdhury, S. Bhowmik","doi":"10.3126/ON.V15I1-2.18789","DOIUrl":"https://doi.org/10.3126/ON.V15I1-2.18789","url":null,"abstract":"An analytical validation of enzyme-linked immunosorbent assay (ELISA) screening for detection of chloramphenicol (CAP) in shrimp and fish was conducted according to the Commission Decision 2002/657/EC and guidelines for the validation of screening methods for residues of veterinary medicines. The analyte was extracted from shrimp and fish with ethyl acetate mixture, and CAP concentrations were measured photometrically at 450 nm. The recovery rate of the analyte from spiked samples was 80%. For the laboratory the cut-off level of CAP in fish and shrimp as the minimum recovery was established along with detection capability (CCβ). No relevant interferences between matrix effects and structurally related substances including florfenicol and thiamphenicol were observed. The experimental results were quite satisfactory and ELISA method was found very useful for determination of CAP residues in shrimp and fish monitoring.","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"29 3 1","pages":"13-18"},"PeriodicalIF":0.0,"publicationDate":"2017-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87801926","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}
引用次数: 3
Bio-chemical characterization of rhizobia isolated from root nodules of Velvet bean (Mucuna pruriens L.) 丝绒豆根瘤中根瘤菌的生化鉴定
Our Nature Pub Date : 2017-12-25 DOI: 10.3126/ON.V15I1-2.18788
Som Prasad Paudyal, V. Gupta
{"title":"Bio-chemical characterization of rhizobia isolated from root nodules of Velvet bean (Mucuna pruriens L.)","authors":"Som Prasad Paudyal, V. Gupta","doi":"10.3126/ON.V15I1-2.18788","DOIUrl":"https://doi.org/10.3126/ON.V15I1-2.18788","url":null,"abstract":"Rhizobia are the symbiotic bacteria found in the soil which have potential ability to convert atmospheric di-nitrogen into usable form. A total of ten rhizobial strains were isolated from the root nodules of a medicinal legume Mucuna pruriens (L.) that commonly grow in the foothills of the Himalaya. All the ten   strains isolated from different locations of same area were morphologically, biochemically and physiologically characterized based on the Bergey’s Manual of systematic Bacteriology. They were tested for the antibiotics sensitivity. The isolates showed high sensitivity to amoxicillin and least to erythromycin. Authentication test was done in eleven legumes but shown nodulations only in Trigonella foenum-graecum, Mucuna pruriens and Medicago sativa. The morphology, physiology, biochemical and infection test studies carried out justifies that the bacteria isolated belonged to the species of Rhizobium meliloti.","PeriodicalId":19905,"journal":{"name":"Our Nature","volume":"128 1","pages":"7-12"},"PeriodicalIF":0.0,"publicationDate":"2017-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90614404","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}
引用次数: 5
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