Physicochemical properties and plankton abundance in sanctuary and non sanctuary areas in the river Meghna, Bangladesh

The study was conducted in the selected sampling spots of sanctuary and non-sanctuary areas viz, Chor bhoirobi, Kaligonj, Ramgoti, Sureswar, Gajaria and upper area of Tarabunia to assess the impact of sanctuary on the abundance and biodiversity of fishes in the river Meghna from September 2015 to December 2015. Seven physicochemical parameters viz water temperature, air temperature, dissolve oxygen (DO), free carbon dioxide (Free CO2), pH, total alkalinity and total hardness, plankton community both phytoplankton and Zooplankton and CPUE with species composition of the river Meghna were studied. In the sanctuary area, Air temperature was found lowest 22.0°C ±1.1 in Ramgoti and highest 33.5°C±0.5 in Chor bhoirobi area of the river Meghna. Water temperature was found ranged from 20.8°C ±0.5 to 32.5°C ±0.2 in Kaligonj. Concentration of dissolve oxygen was found lowest 4.9± 0.1 mg/l in Ramgoti and highest in Chor bhoirobi 6.0±0.2 mg/l. Free carbon di oxide was found highest in Ramgoti 19±0.8 mg/l and lowest in Chor bhoirobi 13.4±0.4 mg/l. PH was found ranged from 7.2±0.6 in Kaligonj to 7.9±0.2 in Chor bhoirobi. Total alkalinity was found highest in Ramgoti 85±11.2 mg/l and lowest in Chor bhoirobi 72.7±4.7 mg/l. Total hardness was found highest in Ramgoti 150.0±45.1 mg/l and lowest in Kaligonj 52.0±12.7 mg/l. In the non sanctuary area, Air temperature was found ranged from 21.10°C ±1.0 to 33.2°C±0.8 in Gajaria and area of the river Meghna. Water temperature was found lowest 17.8°C ±1.3 in Gajaria and highest 31.2°C ±0.6 in Upper Tarabunia. Concentration of dissolve oxygen was found lowest 5.0± 0.3 mg/l in Gajaria and highest in Upper Tarabunia 5.9±0.1 mg/l. Free carbon di oxide was found highest in Gajaria 19.7±1.5 mg/l and lowest in Sureswar 16.2±0.7 mg/l. PH was found ranged from 7.3±0.6 in Sureswar to 7.9±0.2 in Gajaria. Total alkalinity was found ranged from 89.3±25 mg/l to 72.5±11.5 mg/l in Sureswar. Total hardness was found highest in Gajaria 89.2±14.9 mg/l and lowest in Sureswar 62.0±26.3 mg/l. Total 40 genera of phytoplankton belongs to Bacillariophyceae Chlorophyceae, Cyanophyceae, Dinophyceae, Euglenophyceae, Myxophyceae and Xanthophyceae were recorded. Total 9 genera of zooplanktons were found with four families namely Rotifera, Cladocera, Copepoda and Ostracoda. Total 56 boats were estimated to be fishing for hilsa between sanctuary and non sanctuary areas of Bangladesh during September to December. Total length of the boats varied between 6.7 and 16.5 m with an average of 13 m. Asian Australas. J. Food Saf. Secur. 2018, 2(2), 79-85

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Diel dynamics of heleoplankton in relation to some physico-chemical attributes of water in an aquaculture tank in Guwahati, Assam

Journal of Applied and Natural Science ◽

10.31018/jans.v4i1.215 ◽

2012 ◽

Vol 4 (1) ◽

pp. 16-22

Author(s):

Janardan Pathak ◽

M. M. Goswami

Keyword(s):

Water Temperature ◽

T Test ◽

Total Alkalinity ◽

Diurnal Fluctuation ◽

Total Hardness ◽

Numerical Density ◽

Physico Chemical ◽

Free Carbon Dioxide ◽

Chemical Attributes ◽

Positive Correlations

Diurnal fluctuation of the phytoplankton and zooplankton population (numerical densities) and the physicochemical attributes of water are studied in an aquaculture pond at Guwahati, Assam. In the 24 hour diel cycle, the phytoplankton and zooplankton show significant (t-test, p < 0.01) variation in their numerical density at an interval of 4 hours. The studied physico-chemical parameters of water included Temperature, Total Alkalinity (TA), Total hardness (TH), Dissolved Oxygen (DO), Free Carbon dioxide (FCO2) and pH are analyzed concurrently, which reveals a significant fluctuation (t-test, p< .01) in the day and night hours. Multivariate correlation analysis portrays significant and positive correlations among the total population density of phytoplankton with respect to water temperature (r = 0.845, p<0.05) and pH (r = 0.881, p< 0.01) while it maintains significant negative correlations with TA (r = -0.837, p<0.05), TH (r = -0.768, p< 0.05) and FCO2 (r = -0.830, p<0.05). However, total numerical density of zooplankton reveals positive and significant correlations with TA (r = 0.842, p< 0.05) and FCO2 (r= 0.758, p< 0.05) while it shows significant negative correlations with water temperature (r = -0.906, p< 0.01) and pH (r =- 0.912, p< 0.01).

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Changing trends of physicochemical parameters in Kaptai lake of Bangladesh

Research in Agriculture Livestock and Fisheries ◽

10.3329/ralf.v2i2.25017 ◽

2015 ◽

Vol 2 (2) ◽

pp. 319-327 ◽

Cited By ~ 1

Author(s):

Md Abul Bashar ◽

S Sanjib Basak ◽

Kazi Belal Uddin ◽

AKM Saiful Islam ◽

Yahia Mahmud

Keyword(s):

Dissolved Oxygen ◽

Water Temperature ◽

Physicochemical Parameters ◽

Mean Value ◽

Total Alkalinity ◽

Total Hardness ◽

Secchi Disc ◽

Changing Trends ◽

Test Kit ◽

Baseline Information

Physicochemical parameters were studied for a period of two years from July 2012 to June 2014. The parameters namely air and water temperature were estimated using centigrade thermometer, transparency using secchi disc while pH, CO2, total hardness, total alkalinity, dissolved oxygen (DO) were estimated using HACH water test kit. The highest air and water temperature (31.52°C and 30.38°C) were recorded in September, 2013 whereas the lowest air and water temperature 21.04°C and 20.42°C were recorded in January, 2014. The pH of water was found to alkaline in nature (6.9 to 8.20). The maximum free CO2 value (7.81 mg/l) was recorded in February, 2014 and minimum (2.36 mg/l) in November, 2012.The value of total alkalinity was found to fluctuate from 51.9 mg/l in December 2012 to 90.68 mg/l in December 2013. Total hardness of lake water varied from 37.8 (August) to 47.3 (November) in 2012 and 55.17 (July) to 87.49 (February) in 2013-14 with regular trends in fluctuation. Mean secchi disc reading varied from 1.94±.57 m in 2012-13 and 2.02±0.40 m in 2013-14. Dissolved oxygen was found to vary from 6.10 (February) to 6.80 (November) during 2012, 3.90 (February) to 6.38 mg/l (July) during 2013 with a mean value of 6.4±1.51 and 5.74±0.68 mg/l. Water depth was found to fluctuate from 4.39 to 11.76 m with a mean value of 7.96± 2.56 m for one year study. The present research provides baseline information on changing trends of physicochemical parameters of Kaptai Lake which will facilitate sustainable management and conservation of this lake ecosystem.Res. Agric., Livest. Fish.2(2): 319-327, August 2015

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Physico-chemical Parameters of Koshi River at Kushaha Area of Koshi Tappu Wildlife Reserve

Our Nature ◽

10.3126/on.v9i1.5746 ◽

1970 ◽

Vol 9 (1) ◽

pp. 156-167 ◽

Cited By ~ 1

Author(s):

D. Thapa Chhetry ◽

J. Pal

Keyword(s):

Dissolved Oxygen ◽

Water Temperature ◽

Air Temperature ◽

Oxygen Demand ◽

Summer Season ◽

Biological Oxygen Demand ◽

Total Alkalinity ◽

Total Hardness ◽

Chemical Parameters ◽

Wildlife Reserve

The Koshi river is the major tributaries of the Ganges which originates from the snowy peaks of Tibetan plateau in the central Himalayas. Its total catchment area is 60,400 km2, of which 28,140 km2 lies in Nepal, while the remainder is situated in Tibet. It passes from Nepal to India via the Koshi Tappu Wildlife Reserve area of Nepal. It destroys large area through floods, especially in India. This paper deals with the air temperature and phyco-chemical parameters like temperature, transparency, pH, oxygen, carbondioxide, alkalinity, hardness, chloride and biological oxygen demand of water of Koshi river at Kushaha area of Koshi Tappu Wildlife Reserve. The water temperature was recorded maximum in summer season but the transparency, pH, dissolved oxygen, total alkalinity and total hardness were recorded maximum in winter season. Similarly, free carbondioxide was maximum in rainy season and chloride and biological oxygen demand were recorded maximum in summer season. The air temperature and water temperature had positive and significant correlation with free carbondioxide and biological oxygen demand. Dissolved oxygen had positive and significant correlation with pH, total alkalinity and total hardness. Similarly, total alkalinity had positive and significant correlation with transparency, total hardness, chloride etc.DOI: http://dx.doi.org/10.3126/on.v9i1.5746

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Physico-chemical properties of Seepage stream at Shripur area, eastern Nepal

Nepalese Journal of Biosciences ◽

10.3126/njbs.v2i0.7489 ◽

2013 ◽

Vol 2 ◽

pp. 46-54

Author(s):

Damodar Thapa Chhetry ◽

Joydeb Pal

Keyword(s):

Water Temperature ◽

Air Temperature ◽

Rainy Season ◽

Winter Season ◽

Chemical Properties ◽

Summer Season ◽

Total Alkalinity ◽

Total Hardness ◽

First Year ◽

Physico Chemical

Physico-chemical parameters of the Seepage stream of Shripur area were studied for two years from July, 2002 to June, 2004, once in every month at regular intervals. The maximum air temperature was recorded in rainy season during first year (July, 2002 to June, 2003) and second year study period (July, 2003 to June, 2004). Water temperature was maximum in summer and lowest in winter season. Transparency, total alkalinity, total hardness, chloride were maximum in winter season. Free CO2 and BOD was maximum in summer season. The minimum transparency, total alkalinity, total hardness and chloride were recorded in rainy season. DO and pH were maximum in winter and minimum in summer season during the whole study period. Air temperature, water temperature, free CO2, BOD showed positive and significant correlation with each other. Transparency showed positive and significant correlation with pH, DO, total alkalinity, total hardness and chloride. pH showed positive and significant correlation with DO and chloride. Similarly, DO, total alkalinity, total hardness and chloride showed positive and significant correlation with each other. DOI: http://dx.doi.org/10.3126/njbs.v2i0.7489 Nepalese Journal of Biosciences 2 : 46-54 (2012)

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Physico-chemical and Cyanophitic Variation of Ganga Sagar Lake, Jabalpur

International Journal of Current Microbiology and Applied Sciences ◽

10.20546/ijcmas.2021.1010.005 ◽

2021 ◽

Vol 10 (10) ◽

pp. 36-42

Author(s):

Preetraj Singh Patel Balendra Pratap Singh

Keyword(s):

Water Temperature ◽

Physicochemical Parameters ◽

Total Alkalinity ◽

Total Hardness ◽

Chemical Parameter ◽

Post Monsoon ◽

Physico Chemical ◽

Scientific Name ◽

Temperature Water

The present studies focused on the Physico-chemical parameter and Cyanophitic diversity of Ganga Sagar Lake, Jabalpur. The physicochemical parameters like temperature, water temperature, D.O., pH, free CO2, Total alkalinity, total hardness, calcium hardness, chloride, phosphate and nitrate were studied to analyze the Ganga Sagar Lake, Jabalpur. The study area selected was Cyanophitic diversity has been done with scientific name in this Lake. In these studies, an attempt has been made to identify the taxa of Cyanophyta in Pre-monsoon, monsoon, summer and Post monsoon from July 2017 to June 2019.

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Impact of net pen aquaculture on lake water quality

Water Science & Technology ◽

10.2166/wst.2003.0659 ◽

2003 ◽

Vol 47 (12) ◽

pp. 293-300 ◽

Cited By ~ 5

Author(s):

J. Veenstra ◽

S. Nolen ◽

J. Carroll ◽

C. Ruiz

Keyword(s):

Water Quality ◽

Organic Carbon ◽

Dissolved Oxygen ◽

Water Temperature ◽

Ictalurus Punctatus ◽

Oxygen Demand ◽

Total Alkalinity ◽

Total Hardness ◽

Army Corps ◽

Lake Water Quality

A 3-year study was conducted by the U.S. Army Corps of Engineers assessing water quality related impacts of aquaculture of 250,000 channel catfish (Ictalurus punctatus) in floating net pens in the Rock Creek Arm of Lake Texoma, Oklahoma/Texas. Five large nylon nets suspended from a floating framework of galvanized metal anchored in open water 100 m offshore made up the net pens with fish stocking densities varying from 88 to 219 fish/m3. Water quality sampling was conducted biweekly from April to September and monthly from October to March at three locations. On all sampling dates field measurements of water temperature, pH, dissolved oxygen, and conductivity were recorded at 1 m depth intervals and water samples were collected at a depth of 0.5 m and near the bottom of the water column at each site. Sample analyses included: total alkalinity, total hardness, turbidity, chloride, sulfate, orthophosphate, total phosphorus, nitrate-N, nitrite-N, total Kjeldahl nitrogen, total organic carbon, dissolved organic carbon, biochemical oxygen demand, and chlorophyll a. The results showed statistically significant decreases in water temperature and dissolved oxygen and significant increases in field conductivity in surface waters near the net pens relative to other sampling sites. The most dramatic water quality effect observed during the study was decrease in dissolved oxygen levels near the net pens following lake turnover in the second year.

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Study on physico-chemical features of water in Tarahara Fish Farm, Sunsari, Nepal

Nepalese Journal of Biosciences ◽

10.3126/njbs.v7i1.41766 ◽

2017 ◽

Vol 7 (1) ◽

pp. 47-57

Author(s):

Ganesh Bahadur Thapa ◽

Joydeb Pal

Keyword(s):

Water Quality ◽

Water Temperature ◽

Air Temperature ◽

Physicochemical Parameters ◽

Quality Parameters ◽

Fish Farm ◽

Fish Growth ◽

Chemical Parameters ◽

Physico Chemical ◽

Peripheral Areas

Tarahara Fish Farm includes 37 large ponds as a fish super zone. Physicochemical parameters viz., air and water temperature, pH, DO, BOD, CO2, Cl-, TA and TH of these ponds were studied for two years (Nov. 2008 to Oct. 2010). The air temperature had positive and significant correlation with water temperature (r=0.893, P<0.01) but inverse and significant correlation with DO (r = - 0.669 P<0.05) and TH (r = - 0.673, P<0.05). Both air and water temperature showed a decreasing trend during the winter months of November to January and again September to October in both years. Similarly, positive and significant correlation showed by pH with DO (r =0.660, P<0.05) and BOD (r =0.846, P<0.05); by free CO2 with DO (r=0.854, P<0.01), chloride (r=0.648, P<0.05) and TA (r=0.616, P<0.05); by DO with TA (r =0.715, P<0.01) and chloride (r =0.625, P<0.05) and by TH with TA (r= 0.592, P<0.05) but inverse and significant correlation showed by pH with water temperature (r =-0.671, P<0.05); by free CO2 with BOD (r=-0.627, P<0.05) and by DO with BOD (r = -0.810, P <0.01). The water quality parameters were within suitable range for the fish growth and breeding with small fluctuations in different months during the first and second years. Physico-chemical parameters significantly (P<0.01; 0.05) differed between different months. However, no mass mortality of fish was recorded from this site. So, the area selected as fish super zone is fruitful to meet the expected production level of fishes and fish seeds in peripheral areas.

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Environmental Variables of the Seti Gandaki River Basin Pokhara, Nepal

Journal of Institute of Science and Technology ◽

10.3126/jist.v22i2.19604 ◽

2018 ◽

Vol 22 (2) ◽

pp. 129-139 ◽

Cited By ~ 2

Author(s):

Kishor Kumar Pokharel ◽

Khadga Bahadur Basnet ◽

Trilok Chandra Majupuria ◽

Chitra Bahadur Baniya

Keyword(s):

Water Temperature ◽

River Basin ◽

Environmental Variables ◽

Temporal Variations ◽

Total Alkalinity ◽

Urban Site ◽

Water Conductivity ◽

Free Carbon Dioxide ◽

Spatio Temporal ◽

Carbon Dioxide Co2

Present paper focuses on the spatio-temporal variations and correlations among the environmental variables of the Seti Gandaki River basin, Pokhara, Nepal. A total of five sites, three along the river and two in tributaries were selected for this study. Water sampling was done fortnightly for environmental variables following standard methods during July 2011 to June 2012. Mean and standard deviation of the environmental variables revealed that the depth (0.9 ± 0.3), pH (8 ± 0.4), total phosphates (PO4) (0.10 ± 0.03) and nitrates (NO3) (0.13 ± 0.04) were normally variable among the sites. But the discharge (40.00 ± 37.00), width (32.30 ± 13.00), turbidity (81.40 ± 51.00), transparency (29.10 ± 15.00), conductivity (166.00 ± 80.00), water temperature (18.00 ±4.00), dissolved oxygen (DO) (8.00 ± 2.00), free carbon dioxide (CO2) (7.00 ± 2.00) and total alkalinity (98.00 ± 22.00) varied among sites equally. Correlation coefficient between the sites and environmental variables revealed that sites were found significantly correlated with water conductivity (r2 = 0.6), DO (r2 = -0.52), and free CO2 (r2 = 0.6); depth of water with width (r2 = 0.94), discharge (r2 = 0.96), turbidity (r2 = 0.71), transparency (r2 = -0.62), water temperature (r2 = 0.60), pH (r2 = -0.52) and DO (r2 = -0.48); water temperature with pH (r2 = -0.54), DO (r2 = -0.79), free CO2 (r2 = 0.69), total alkalinity (r2 = -0.58), total PO4 (r2 = 0.54) and NO3 (r2 = 0.62), etc. The enhancement of turbidity, conductivity, free CO2, phosphates and nitrates, while, suppression of transparency, pH and DO at the urban site indicated the urban influence. Journal of Institute of Science and TechnologyVolume 22, Issue 2, January 2018, page: 129-139

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Investigation of the lake-effect on the local thunderstorm activity around the Lake Fertő, Hungary

10.5194/egusphere-egu2020-10387 ◽

2020 ◽

Author(s):

Gayane Karapetyan ◽

Veronika Barta

Keyword(s):

Great Lakes ◽

Water Temperature ◽

Air Temperature ◽

Positive Impact ◽

Thunderstorm Activity ◽

Lightning Activity ◽

Lower Atmosphere ◽

Distribution Maps ◽

Negative Effect ◽

The Impact

Natural and artificial lakes are able to change the climate of their surroundings. These modifications are collectively known as lake effects and range from microscale to synoptic scale. The presence of the lake can cause negative effect on the local thunderstorm activity in summertime decreasing the convection and precipitation over lakes due to the greater stability created by the lower atmosphere and the colder surfaces of the lake [1, 2]. However, it also can have a positive impact on thundercloud generation when the temperature difference between air in 850 mb height and near earth's surface is more than 13 C causing instability in the atmosphere [3].&#160;The main objective of the present study is to investigate the impact of Lake Fert&#337; (Neusiedler See, located in Hungary and Austria) on local thunderstorm activity by applying statistical analysis on meteorological and lightning data and event studies. Data of the Blitzortung lightning location network, local meteorological data (temperature, precipitation) measured at stations around the lake, water temperature measured at Fert&#337;r&#225;kos and temperature measured at 850 mb in Vienna station were used for the analysis. The local thunderstorm activity was investigated during summertime (May - September) in 2015, 2016 and 2017. Lightning distribution maps above and around the lake for the investigated period have been determined based on the Blitzortung data.&#160;According to the lightning distribution maps we can not observe any positive impact of the lake on the lightning activity when water temperature was higher than the air temperature around the lake. Furthermore, we can not conclude that there is a clear negative effect of the lake on the lightning activity based on the lightning distribution maps when the air temperature is higher than the water temperature. Nevertheless, there are some months when it seems a clear border between the lightning activity measured above the lake and at the coast (e. g. in June and July 2015, June 2016). The negative effect also seems to appear in some cases of the investigated local individual thunderstorms, namely the thunderstorm activity is larger above the surrounding surface than directly above the lake. This seems to strengthen the hypothesis that "Deep convection is not often formed in summer above the lakes, and existing storms dissipate significantly when moving above the lakes due to the greater stability created by the lower atmosphere and the colder surfaces of the lake" [1].&#160;[1] Lyons, W. A., Some effects of Lake Michigan upon sqall lines and summertime convention. Proc. 9th Conf. Great Lakes Research, Great Lakes Res. Div. Publ. No. 15, University of Michigan, 259&#8211;273, 1966[2] Scott, R. W., & Huff, F. A. . Impacts of the Great Lakes on Regional Climate Conditions. Journal of Great Lakes Research, 22(4), 845&#8211;863., 1996[3] Wilson, J. W. : Effect of Lake Ontario on precipitation. Mon. Wea. Rev. 105, 207&#8211;214., 1977

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Investigation of Phytoplankton and Physico-chemical Parameters in Nursery, Growout and Broodstock Ponds

10.31219/osf.io/u9yvk ◽

2019 ◽

Author(s):

Istiaque Hossain ◽

Md. Mahmudul Alam ◽

M. Alam ◽

B. M. M. Kamal ◽

Shams Muhammad Galib

Keyword(s):

Water Temperature ◽

Cell Density ◽

Ammonia Nitrogen ◽

Total Alkalinity ◽

Total Hardness ◽

Brood Stock ◽

Positive Correlation ◽

Nursery Pond ◽

Physicochemical Variables ◽

Total Phytoplankton

The study measures the relationship between physicochemical variables with the cell density of phytoplankton in different stages of pond – nursery ponds, grow out ponds and brood stock ponds. The study was conducted on nine fish ponds as three from each category of pond at Natore Government Fish Farm in Bangladesh, during the months of January to June in 2012. The observed physicochemical variables– water temperature, transparency, dissolved oxygen, pH, ammonia-nitrogen, total alkalinity and total hardness – were found within the standard ranges. Four groups of phytoplankton– Bacillariophyceae, Chlorophyceae, Cyanophyceae and Euglenophyceae– werefound among the ponds where Euglenophyceae was recorded highest number almost in all ponds over the study period. Total abundance of different groups of phytoplankton was recorded as mean (±SD) cell density (cell/l) 62.77±2.16×104, 47.22±0.69×104, and 77.12±3.42×104 in nursery pond, grow out pond and brood stock pond, respectively. Overall phytoplankton was found better in brood stock pond than others. Total phytoplankton density has been exhibited significantly positive correlation with DO and inverse relation with water temperature, pH, ammonia-nitrogen and total alkalinity in case of nursery pond. In case of grow out pond, total phytoplankton density has been exhibited significantly positive correlation with temperature and transparency, and significantly negative correlation with others physicochemical characteristics. In case of brood stock pond, total phytoplankton density has no significant relationship with any physicochemical variables of water.

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