https://myresearchjournals.com/index.php/CE <h2 class="under-mark">Current Environment</h2> <p>Current Environment is an open access journal which means all contents of the journal are freely available for everyone in accordance with BOAI open access definition and guidelines. Users are allowed to read, download, distribute, print, or share the full texts of articles from this journal without prior permission from the publisher or the authors. The journal follows the ethical publishing guidelines defined by different renowned international organizations. Besides, manuscripts are invited from all the branches of Environmental Sciences. This journal mainly welcomes any interesting manuscripts which cover research of any issue of the concurrent environments, basic to applied research level. However, the journal also expects all coming manuscripts with scientific quality, language standard and current or future significances of the findings</p> BSE Press en-US Current Environment 2789-7982 https://myresearchjournals.com/index.php/CE/article/view/6657 Currently, the world environment is changing more rapidly than at any other time. These changes have immense effects on aquatic life forms, from microscopic plankton to large fish (1). Some of the relevant stressors, amongst many, are temperature, salinity, and water pH, all of which are variables that directly impact living organisms present in the concerned aquatic environments (2). Scientists have found a correlation with physiological, morphological, and molecular changes in living organisms due to environmental fluctuations. In any aquatic ecosystem, photosynthetic primary producers are the basis of other life forms, and it is now established that environmental change has many detrimental effects on these primary producers; thus aquatic ecosystems. For example, increasing temperatures can reduce the productivity, cell size, and overall growth of many aquatic organisms, also a significant cause for coral bleaching (3,4). MOHAMMED ABU-DIEYEH ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-nd/4.0 2021-10-24 2021-10-24 1 01 1 2 10.54479/ce.v1i01.6657 https://myresearchjournals.com/index.php/CE/article/view/6658 This experiment studied the probable effects of lowered pH (6.5 to 5.0) on four freshwater phytoplankton species Chlorella vulgaris Beyerinck, Scenedesmus quadricauda (Turpin) Brebbison, Euglena granulata (Klebs) Schmitz and Gomphonema subtile Ehrenberg. The initial community composition was 2:2:1:1 for the four taxa respectively, which changed to 1.7:1.6:1:1 in pH 6.0, 1.6:2:1.6:1 in pH 5.5 and 1.2:2:1.8:1 in pH 5.0. The two chlorophytes showed almost gradual decreasing in growth rates and cell densities with the decreases in pH values, while diatom E. granulata showed more tolerance in a wide range of pH (6.5 to 5.5). Conspicuous changes in total biomass first observed in pH 6.0 and it reached the drastic level in pH 5.0. Moreover, significant changes in cell size of S. qaudricuada and E. granulata were found in pH 5.0 only. This lowered pH range has no effects on cell shape of the studied phytoplankton species. SHASWATI CHAKRABORTY MAHIN AFROZ RIYAD HOSSEN ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-nd/4.0 2021-10-24 2021-10-24 1 01 3 8 10.54479/ce.v1i01.6658 https://myresearchjournals.com/index.php/CE/article/view/6661 Zooplankton are found very sensitive to even slight aquatic pollution due to a number of chemical imbalances in freshwater bodies. As an amazing tiny creature zooplankton play a very crucial role in the aquatic food chain by transferring energy from primary levels to tertiary organisms. For many years it has been well established that zooplankton act as promising biological indicators to continuously fluctuating aquatic environments and subsequently to global warming. While reacting to these aquatic environmental fluctu-ations, zooplankton population growth can either be stimulated or inhibited. The presence or absence of particular zooplankton species can reveal the trophic status of the water body. Moreover, in a harsh env-ironment, algal toxins may have drastic effects on the behavioral characteristics of zooplankton. JABER BIN ABDUL BARI MD. SAIFUL ISLAM SANJIDA AKTER NISA NAZNIN AKTER TISHA IRINA MASHKOVA NAJMUS SAKIB KHAN ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-nd/4.0 2021-10-24 2021-10-24 1 01 9 14 https://myresearchjournals.com/index.php/CE/article/view/6659 There are many man-made water reservoirs found in Barishal City. This study was aimed to assess the existing condition of physico-chemical properties of four different water reservoirs, namely Bibir Pukur (pond), Amtala Lake, Choumatha Lake and City Corporation Pond of Barishal City of Bangladesh. To evaluate the physico-chemical properties, the average of the parameters such as water temperature, total dissolved solids, electric conductivity (EC), pH, salinity, as well as depth, color, and transparency of water were analyzed. The highest average water temperature was found in the City Corporation Pond, which determined as 31.77±0.09 °C. Electric conductivity (ms/cm) and total dissolved solids (ppm) of Amtala Lake were 0.413 ±0.009 and 199±1.15. The highest average pH 7.88±0.01 and lowest salinity 140±1.73 were found in City Corporation Pond and Choumatha Lake respectively. The water depth of Bibir Pukur was 260.33± 13.98 cm which is the highest among the four water reservoirs. The highest values of dissolved oxygen and phosphate were 2.03±0.12 mg/l and 294.12±3.92 μg/l. MD. MAHADIY HASAN MD. ASHIKUR RAHMAN LASKAR TAHIDUL ISLAM TANIA SULTANA ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-nd/4.0 2021-10-24 2021-10-24 1 01 15 20 10.54479/ce.v1i01.6659 https://myresearchjournals.com/index.php/CE/article/view/6660 This study measured surface water temperature, water pH, TDS, EC, DO, nitrate, ammonium, sulphate and DIP as water physico-chemical properties of four freshwater reservoirs from Barishal Sadar upozilla. The surface water temperature was recorded highest (22.4 °C) in station 4 and loest was in station 1. Water pH, nitrate, ammonium and sulphate showed almost same results among the four reservoirs. TDS and EC values range from 188 to 215 mg/l and 195 to 225 µS/cm, respectively. DO level was almost similar in all the stations except station 1 which showed comparatively lowest amount (4.55 mg/l). DIP ranges from 3.20 to 4.15 mg/l. Among the four reservoirs, comparatively newly established BU pond (station 4) showed poor results than the others. AFROJA NASRIN ##submission.copyrightStatement## http://creativecommons.org/licenses/by-nc-nd/4.0 2021-10-24 2021-10-24 1 01 21 26 10.54479/ce.v1i01.6660