The Physico-chemical Factors of Water in Relation to Mosquito Breeding in Trinidad

1932 ◽  
Vol 23 (4) ◽  
pp. 477-496 ◽  
Author(s):  
Mary V. F. Beattie
Keyword(s):  
Carbon Dioxide ◽  
Dissolved Oxygen ◽  
Nitrogen Content ◽  
Organic Nitrogen ◽  
Rice Field ◽  
Ammonia Nitrogen ◽  
Physico Chemical ◽  
Mosquito Breeding ◽  
Chemical Factors

1. An analysis of rice-field and canal waters was made over a period of 1 year.2. The incidence of Anopheles tarsimaculatus in these fields and canals was noted.3. The chemical factors estimated were pH, carbon dioxide, organic nitrogen, dissolved oxygen, nitrites, nitrates, phosphates and ammonia nitrogen.4. No correlation was found between the incidence of A. tarsimaculatus and the following factors: pH, carbon dioxide, organic nitrogen, dissolved oxygen, nitrites, nitrates and phosphates.5. In nature the female A. tarsimaculatus seemed to prefer waters with a low ammonia nitrogen content, larvae being rarely found in water with a content greater than 0·04 parts per 100,000. In the laboratory the larvae of A. tarsimaculatus lived several days in waters with an ammonia nitrogen content as high as 0·12 parts per 100,000. Therefore it was concluded that ammonia nitrogen had some bearing upon the prevalence of this Anopheles, affecting the oviposition of the female rather than the growth of the larvae.

scholarly journals Physico-chemical properties of water of Ramshagar dighi, the largest man made historical reservoir in northern Bangladesh

2018 ◽  
Vol 23 ◽  
pp. 29-37
Author(s):  
Ashaduzzaman ◽  
MJ Hossain ◽  
S Akther
Keyword(s):  
Carbon Dioxide ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Air Temperature ◽  
Water Depth ◽  
Chemical Properties ◽  
Current Status ◽  
Chemical Parameters ◽  
Monthly Average ◽  
Physico Chemical

Ramshagar dighi is a larger historical man made reservoir (Dighi, Bengali meaning) situated at Tajpur village in Dinajpur, Bangladesh. This study was aimed to estimate current status of physico-chemical variables of water of Ramshagar dighi at Dinajpur District, Bangladesh. Monthly average changes in physico-chemical parameters such as water temperature, total dissolved oxygen, air temperature, humidity, rainfall, water depth and pH of water were analyzed for the period of 11 months from May 2011 to March 2012. The average air temperature (°C) at the study area of Ramshagar dighi at Dinajpur District was determined as 24.97 ± 4.92. Our present study showed that physico-chemical properties of water in Ramshagar dighi were monthly average of water temperature (°C) as 24.68 ± 4.77, air temperature (°C) 24.97 ± 4.92, humidity as 82.075 ± 4.14, rainfall as 1534.5 mm, water depth as 9.10 m ± 1.286, pH as7.67± 0.48 and carbon dioxide as 0.85 ± 0.92 as well as dissolved oxygen as 4.65 ± 0.62 respectively during the period of May 2011 to March 2012. Therefore, present study was conducted to assess physico-chemical properties of water of Ramshagar dighi, Dinajpur, Bangladesh.J. bio-sci. 23: 29-37, 2015

scholarly journals Monthly and diurnal variations of limnological conditions of two ponds

2017 ◽  
Vol 7 (1) ◽  
pp. 14-20
Author(s):  
AKM Fazlur Rahaman ◽  
MA Mansur ◽  
M Shahidur Rahman
Keyword(s):  
Carbon Dioxide ◽  
Dissolved Oxygen ◽  
Research Work ◽  
Diurnal Variations ◽  
Free Carbon ◽  
Total Alkalinity ◽  
Diurnal Changes ◽  
University Campus ◽  
Physico Chemical ◽  
Free Carbon Dioxide

A study on monthly and diurnal changes of limnological conditions of two ponds was conducted in the Bangladesh Agricultural University campus, Mymensingh. The research work was performed by studying the limnological parameters such as transparency, temperature, dissolved oxygen, free carbon dioxide, pH, total alkalinity, nitrate-nitrogen, phosphate-phosphorus and plankton. Diurnal variations of physico-chemical factors were studied fortnightly at 6 hrs intervals at 6 a.m., 12 noon, 6 p.m. and 12 midnight. The amounts of transparency, dissolved oxygen and pH were higher during winter months than in summer months in both the ponds. Transparency, water temperature, total alkalinity, NO3-N and PO4-P were higher during summer months than in winter months in both the ponds. But the amount of free carbon dioxide was higher during winter months than in summer months in pond 1 while in pond 2 the amount of free carbon dioxide was higher during summer months than in winter months. Qualitative and quantitative monthly variations of phytoplankton and zooplankton were observed in both the ponds during the study period. The highest amount of dissolved oxygen, pH and total alkalinity were recorded at 6 p.m. and the lowest amounts of those at 6 a.m. in both the ponds. The highest temperature was recorded at 12 noon and the lowest at 12 midnight. But the highest amount of free carbon dioxide was recorded at 6 a.m. and the lowest at 6 p.m. in both the ponds. All the factors showed appreciable diel variations throughout the study period, which indicate that the ponds are productive.Int. J. Agril. Res. Innov. & Tech. 7 (1): 14-20, June, 2017

scholarly journals Gas-Phase and Aqueous Photocatalytic Oxidation of Methylamine: The Reaction Pathways

2007 ◽  
Vol 2007 ◽  
pp. 1-6 ◽  
Author(s):  
Anna Kachina ◽  
Sergei Preis ◽  
German Charles Lluellas ◽  
Juha Kallas
Keyword(s):  
Carbon Dioxide ◽  
Gas Phase ◽  
Continuous Flow ◽  
Photocatalytic Oxidation ◽  
Organic Nitrogen ◽  
Flow Reactor ◽  
Ammonia Nitrogen ◽  
Alkaline Media ◽  
Reaction Pathways ◽  
Continuous Flow Reactor

Photocatalytic oxidation (PCO) of methylamine (MA) on titanium dioxide in aqueous and gaseous phases was studied. A simple batch glass reactor for aqueous PCO and an annular continuous flow reactor for the gas-phase PCO were used. Maximum aqueous PCO efficiency was achieved in alkaline media. Two mechanisms of aqueous PCO—decomposition to formate and ammonia, and oxidation of organic nitrogen directly to nitrite—lead ultimately toCO2, water, ammonia, and nitrate: formate and nitrite were observed as intermediates. A part of the ammonia formed in the reaction was oxidized to nitrite and nitrate. Volatile PCO products of MA included ammonia, nitrogen dioxide(NO2), nitrous oxide(N2O), carbon dioxide, and water. Thermal catalytic oxidation (TCO) resulted in the formation of ammonia, hydrogen cyanide, carbon monoxide, carbon dioxide, and water. The gas-phase PCO kinetics is described by the monomolecular Langmuir-Hinshelwood model. No deactivation ofTiO2catalyst was observed.

scholarly journals Macrozoobenthos With Chemical and Physics factor in the Babura rivers Deli Serdang

2016 ◽  
Vol 1 (2) ◽  
pp. 44
Author(s):  
Masdiana Sinambela ◽  
Mariaty Sipayung
Keyword(s):  
Dissolved Oxygen ◽  
Abiotic Factors ◽  
Measured Parameter ◽  
Physical Factors ◽  
Biotic Factors ◽  
Still Life ◽  
Ex Post ◽  
Physico Chemical ◽  
Ex Post Facto ◽  
Chemical Factors

Research Title “Macrozoobenthos with physico-chemical factors on water and river Babura Deli Serdang”. The measured parameter is existence of macrozoobenthos That biotic factors and abiotic factors ie chemical and physical factors. Physical factors ie: temperature, turbidity, dan chemical factors ie factors: pH, Dissolved Oxygen (DO), dan BOD, COD, and fosfat.  Macrozoobenthos were taken using a Surber net in Mei 2015, there are 2 station.  Where with number of macrozoobenthos in the river Babura 12 individu ie : 1 sp in station 1 ie Melanoides sp and 4 sp in station 2 ( 12 individu) ie Melanoides sp 2 individu, Hetelimnius sp 1 individu, Elmidae 2 individu, Epicordulia sp 1 individu, Chironomus sp 4  Melanoides 2 sp, dan Dragonfly nymph 4 individu. Chemical and physical factors still life macrozoobenthos support. An ex post facto research initials, it can  use as baseline.   Keywords: existence, macrozoobenthos, factor  physic, chemistry

scholarly journals Use of Duckweed as Feed for Fishes in Polyculture

1970 ◽  
pp. 157-160
Author(s):  
ANMA Kabir ◽  
MA Hossain ◽  
MS Rahman
Keyword(s):  
Body Weight ◽  
Dissolved Oxygen ◽  
Nitrate Nitrogen ◽  
Silver Carp ◽  
Total Alkalinity ◽  
Fish Feed ◽  
Fish Production ◽  
Physico Chemical ◽  
Triple Super Phosphate ◽  
Chemical Factors

Effect of duckweed supplementation as fish feed to polyculture system was investigated. Fish were reared for 90 days with or without duckweed supplementation. The ponds were fertilized with cowdung, urea and triple super phosphate. All the important physico-chemical factors including temperature, transparency, dissolved oxygen, total alkalinity, phosphate-phosphorus and nitrate-nitrogen were within productive ranges for fish culture. Ponds were stocked with silver carp, Thai sharputui, tilapia, common carp and mrigel. After a 90 days rearing period, net fish production was found to be significantly higher in fish fed duckweed at a rate of 20% of body weight compared to fish without duckweed supplement. It was concluded that duckweed can effectively be used as feed for polyculture of fish. Key words: Duckweed; polyculture; feed. DOI: 10.3329/jard.v7i1.4437 J Agric Rural Dev 7(1&2), 157-160, June 2009

scholarly journals Influence of physico-chemical factors on the zooplankton population of Bostami pond of Chittagong

2016 ◽  
Vol 44 (1) ◽  
pp. 73-87
Author(s):  
Sajeda Akter ◽  
Abdul Maleque Bhouyain ◽  
Subarna Azad ◽  
Dilshad Nasrin
Keyword(s):  
Carbon Dioxide ◽  
Water Depth ◽  
Common Species ◽  
Total Dissolved Solids ◽  
Free Carbon ◽  
Dissolved Solids ◽  
Keratella Cochlearis ◽  
Physico Chemical ◽  
Free Carbon Dioxide ◽  
Chemical Factors

The study was conducted on the influence of physico-chemical factors on the zooplankton of Bostami pond in Chittagong city for a period of one year from February 2013 to January 2014. During this study the water depth varied from 1.54 to 2.53 m, water temperature 24.5 to 32.6°C, conductivity 0.234 to 0.297 mS, turbidity 26.55 to 33.41 ntu, light intensity 27 to 39.5 lux, total dissolved solids 161 to 191 ppm, pH 7.02 to 7.79, dissolved oxygen 3.4 to 5.73 ppm, free carbon dioxide 2.82 to 5.85 ppm, and calcium 25.08 to 43.03 ppm. It was found that the temperature was less during February 2013 and gradually increased up to June 2013. Then with a break in July it gradually decreased until the next January 2014. More or less reverse data observed for the monthly variation of conductivity, total dissolved solids and calcium. Free carbon dioxide is inversely related with water depth and pH. In total 19 species of zooplankton were identified, where 16 rotifera were the dominant followed by two copepods and one cladoceran. Among these, Brachionus diversicornis, B. angularis, B. quadridentatus, B. falcatus, B. calyciflorus, B. forficula, B. caudatus, Platyias patulus, Keratella cochlearis, Lecane luna, Trichocerca cylindrica, Polyarthra vulgaris, Asplanchna priodonta, A. brightwelli, Filinia longiseta, F. terminalis, Mesocyclops leuckarti, Cyclops varicans rubellus and Moina brachiata were the most common species in the pond throughout the year. Abundance of phytoplankton and zooplankton indicated that the nutrient quality of the pond water was good. The total phytoplankton varied from 842 to 2223 individuals/l and total zooplankton 187 to 494 individuals/l; with rotifera 105 to 266 individuals/l, copepoda 43 to 135 individuals/l and cladocera from 39 to 115 individuals/l throughout the year. Plankton abundance and physico-chemical characteristics of the Bostami pond indicate that the pond is eutrophic in nature.Bangladesh J. Zool. 44(1): 73-87, 2016

scholarly journals Anopheles breeding in relation to aquatic vegetation and certain physico-chemical parameters in rice fields of Purnia district

2013 ◽  
Vol 14 (1&2) ◽  
pp. 121-125
Author(s):  
B. N. Pandey ◽  
Ranjana Kumari
Keyword(s):  
Aquatic Vegetation ◽  
Control Program ◽  
Larval Survival ◽  
Rice Fields ◽  
Chemical Parameters ◽  
Blue Green Algae ◽  
Physico Chemical ◽  
Vector Control Program ◽  
Mosquito Breeding ◽  
Chemical Factors

Anopheles breeding in relation to aquatic vegetation and certain physico-chemical parameters was studied in rice fields of Purnia district. Association of larvae with different types of aquatic vegetation in different proportions was observed. Maximum Anopheles larvae were found associated with green and blue green algae. It indicates that algae encountered mosquito breeding by providing food and shelter followed by Ipomea, Hydrilla and water hyacinth. Among physico-chemical parameters pH, temperature, turbidity, electrical conductivity, DO, nitrate, carbonate and phosphate showed positive correlation while chloride and bicarbonate showed negative correlation. It can be concluded that aquatic vegetation usually growing in rice fields influences Anopheles breeding and their abundance varies with the occurrence and intensity of each aquatic plant. Physico-chemical factors also exert impact on larval survival and emergence. Thus, such factors should be considered when designing an integrated vector control program. However, a detailed study on the role of other interrelated factors such as predator-parasitie relationship, cultivation practices, emergence rate etc is needed for full understanding of the subject. Although the specific soil type was not analyzed in this survey, other reports indicated that there is variation in development of Anopheles larva among the different soil types

scholarly journals Monthly Variations of Physico-Chemical Factors of Keenjhar Lake, Sindh, Pakistan

2019 ◽  
Vol 10 (1) ◽  
pp. 29-35
Author(s):  
Shahina Rao ◽  
Muhammad Arshad Azmi ◽  
Solaha Rahman
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Air Temperature ◽  
Lake Water ◽  
Fish Culture ◽  
Physico Chemical ◽  
Permissible Range ◽  
Chemical Factors ◽  
Monthly Variations

The present study was carried out with the aim to assess water quality using physico-chemical factors ofKeenjhar lake. For this purpose, lake water was analyzed with regular intervals. The air temperature ranged between 21°C to 38 °C, water temperature between 19 °C to 36 °C , pH 5.5 to 8, dissolved oxygen 2.26 mg/L to 6.81 mg/L,salinity 0.16 mg/L to 1.13 mg/L, alkalinity from 30 mg/L to 165 mg/L, acidity 8 to 110 mg/L, sulphate 2.6 mg/L to 310mg/L, phosphate from 1 mg/L to 31 mg/L and nitrates 16 mg/L to 180 mg/L during 2006, 2007 and 2008. It wasconcluded that various parameters lie within the permissible range except in a few months and suitable for drinking,irrigation and fish culture purposes.

scholarly journals Physico-chemical aspects of Chandbill Oxbow lake of Meherpur, Bangladesh

1970 ◽  
Vol 20 (1) ◽  
pp. 31-39
Author(s):  
AKM Nazrul Kabir ◽  
M Niamul Naser
Keyword(s):  
Dissolved Oxygen ◽  
Water Depth ◽  
Secchi Depth ◽  
Ammonia Nitrogen ◽  
Total Alkalinity ◽  
Oxbow Lake ◽  
Total Hardness ◽  
Secchi Disc ◽  
Secchi Disc Depth ◽  
Physico Chemical

Some physico-chemical parameters of Chandbill Baor, a natural oxbow lake of Meherpur district were studied from September 2006 to August 2007. Air temperature of the study area varied from 18.10 to 32.10°C (x-bar± SE : 27.73 ± 1.22°C). The Water temperature (17.10 to 32.10°C; x-bar± SE: 28.24 ± 1.32°C), Secchi disc depth (8.89 to 53.34 cm; x-bar± SE : 26.19 ± 4.29 cm), water depth (132.08 to 307.34 cm; x-bar± SE : 183.93 ± 13.88 cm); total alkalinity (51.3 to 85.5 mg/l; x-bar± SE : 68.4 ± 3.64 mg/l), total hardness (85.5 to 188.10 mg/l; x-bar± SE : 125.81 ± 9.38 mg/l), dissolved oxygen (5.0 to 12.0 mg/l; x-bar± SE: 8.42 ± 0.62 mg/l), free CO2 (5.0 to 30.0 mg/l; x-bar± SE : 14.58 ± 2.64 mg/l), pH (8.0 to 10; x-bar± SE : 8.54 ± 0.19), ammonia-nitrogen (0.3 to 0.7 mg/l; x-bar± SE: 0.46 ± 0.04 mg/l) in the 'Baor' water were found to be suitable for survival of aquatic fauna. Nitrite-nitrogen was absent in the 'em>Baor' throughout the year. Positive correlations were observed in between air and water temperature (r = 0.978); free CO2 and Secchi depth (r = 0.839), free CO2 and water depth (r = 0.714); water depth and Secchi depth (r = 0.903); total hardness and total alkalinity (r = 0.861) and pH with DO (r = 0.661). However, inverse relations were observed among ammonia-nitrogen with water depth (r = −0.727); ammonia-nitrogen with Secchi disc depth (r = −0.840); dissolved oxygen with free CO2 (r = −0.636); pH with Secchi disc depth (r = −0.581) and pH with free CO2 (r = −0.825). The productivity of the lake was found to be medium and could be improved to higher level. Alkaline pH (8.54 ± 0.19) was supposed to be helpful for proper growth and development of fishes and aquatic organisms. This is the first limnological report from a natural ‘Baor’ (Oxbow lake) of Meherpur district, Bangladesh.Key words: Physico-chemical aspects; Oxbow lake; MeherpurDOI: http://dx.doi.org/10.3329/dujbs.v20i1.8835Dhaka Univ. J. Biol. Sci. 20(1): 31-39, 2011 (January)

scholarly journals Effects of feeding and fertilization on the growth and production of puntius sophore in seasonal ponds in Natore, Bangladesh

2014 ◽  
Vol 20 ◽  
pp. 135-142
Author(s):  
BM Mostafa Kamal ◽  
Md Istiaque Hossain ◽  
Md Mosaddequr Rahman ◽  
Md Abdul Mannan ◽  
Md Al-Amin Sarker
Keyword(s):  
Dissolved Oxygen ◽  
Total Hardness ◽  
Total Production ◽  
Fish Production ◽  
Seasonal Ponds ◽  
Physico Chemical ◽  
Chemical Factors ◽  
Puntius Sophore ◽  
Indigenous Fish Species ◽  
Local Farmers

Context: Local farmers believe that the seasonal ponds and ditches which can retain water for 4 to 6 months in a year cannot be utilized for fish production but in fact such waters hold tremendous potential for culture of small indigenous fish species. Objectives: To evaluate the effects of fertilization and feeding in the growth and production of Puntius sophore culture in seasonal ponds. Materials and Methods: Six ponds were used during this study under two treatments. Two treatments such as T1 (only fertilizer) and T2 (fertilization and supplementary feeding) were run in triplicate. P. sophore was stocked in the two treatments at the rate of 15500 ha-1 after necessary pond preparation and fertilization. Results: Important physico-chemical factors viz., temperature, transparency, pH dissolved oxygen and total hardness of two treatments were found within the productive ranges. Four groups of phytoplankton were found in the ponds namely Bacillariophyceae, Chlorophyceae, Cyanophyceae and Euglenophyceae and two groups of zooplankton viz. Crustacea and Rotifera. P. sophore successfully breed in both treatments. However, the number of fish harvested was 122135 ha-1 in T1 and 113335 ha-1 in T2. Yet the total production was higher in T2 (1091.40 kg ha-1) than in T1 (842.72 kg ha-1) as the individuals found in T2 gained more weight than those in T1 reflecting the effects of regular feeding. Conclusion: The study indicated that both fertilizer and feed based treatment was to improve more production than only fertilizer based treatment under seasonal pond conditions. DOI: http://dx.doi.org/10.3329/jbs.v20i0.17735 J. bio-sci.  20:  135-142, 2012

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