scholarly journals Study on the Present Status of Endangered Fishes and Productivity of Teesta River Closest to Barrage Region

2020 ◽  
Vol 7 (3) ◽  
pp. 577-589
Author(s):  
AKM Rohul Amin ◽  
Md Rakibuzzaman Shah ◽  
Md Mahmood Alam ◽  
Imran Hoshan ◽  
Md Abu Zafar
Keyword(s):  
Monsoon Season ◽  
Benthic Fauna ◽  
Present Condition ◽  
Threatened Fish ◽  
Water And Sediment ◽  
Threatened Fishes ◽  
Mastacembelus Armatus ◽  
Good Productivity ◽  
Macro Benthos ◽  
Take All

This study was conducted to monitor the present condition of endangered fishes and productivity of Teesta river closest to Teesta barrage situated in the Lalmonirhat district of Bangladesh. Water and sediment samples were collected twice in a month during the study period from six different (3 upstream and 3 downstream) sites with three replications for each. Required information about threatened fishes was collected from the sampling region associated fishermen and fish markets. The study disclosed over 50 threatened fish species in Teesta river including several threatened fishes namely Bagarius bagarius, Sisor rabdophorus etc. The commonly available endangered fishes were Macrognathus aculiatus, Mastacembelus armatus, Barilius tileo, Raiamas bola, Botia dario, B. lohachata etc. which are rarely available in nationwide. Planktonic flora and fauna determination revealed that comparatively higher density of plankton (n >11500 per liter) as well as more number of planktonic flora (>21 nos.) and fauna (>9 nos.) were monitored in the early monsoon and monsoon season (April-September) and comparatively lower planktonic density (n<10000 per liter) and less number were found in premonsoon season (January-February). The investigation of benthic fauna showed that the riverine ecosystem near to barrage contained 16 species of macro-benthos from different groups. Lastly, it can be noticed that it is very essential to take all effective necessary actions to provide good productivity and conserve the ichthyo diversity of Teesta river that will help to conserve the commonly available endangered and critically endangered fishes of Teesta river. Res. Agric., Livest. Fish.7(3): 577-589,  December 2020

Influence of environmental factors on abundance and temporal variation of benthic fauna resources in the eutrophic Tha Chin estuary, Samut Sakhon province, Thailand

2011 ◽  
Vol 64 (6) ◽  
pp. 1261-1269
Author(s):  
Nittaya Ritnim ◽  
Charumas Meksumpun
Keyword(s):  
Environmental Factors ◽  
Temporal Variation ◽  
Negative Impact ◽  
Salinity Gradient ◽  
Sediment Quality ◽  
Benthic Fauna ◽  
Dry Weight ◽  
High Accumulation ◽  
Water And Sediment ◽  
The Status

The influence of environmental factors on the abundance and temporal variation of benthic fauna resources was studied in the eutrophic Tha Chin estuary located in Samut Sakhon province. The objectives were to analyze the status of abundance and temporal variation of the benthic fauna and to clarify the impacts from environmental factors (water and sediment quality). Field surveys were conducted monthly from August 2007 to March 2008 at 11 sampling stations in the estuary. Based on freshwater runoff volumes, the high-, medium-, and low-loading periods were categorized to be from August to October 2007, November to December 2007, and January to March 2008, respectively. The benthic fauna resources were composed of 57 species in eight phyla. Annelids were the dominant species (with the maximum density being 19,885 individuals/m2), followed by the mollusks. Both densities decreased during the low-loading period in 2008. Water quality deteriorated during the high-loading period. Land-based wastewater discharges decreased the levels of salinity and dissolved oxygen but dramatically increased various nutrients. Consequently, the sediment quality deteriorated during the medium-loading period. Bottom deposits during this time depicted high accumulation of acid volatile sulfides (more than 0.76 mg/g dry weight). Analyzing the environmental relationships, deposit feeders (for example, Nereis sp. and Prionospio sp.) and a clam (Arcuatula sp.) showed potential as bio-indicators for environmental monitoring. The overall results revealed the importance of changes in the water and sediment qualities that had an influence on related benthic resources. The increase in the level of NH4+-N had a negative impact on the economic clam species, while the sedimentary TOM showed positive correlation (P &lt; 0.05) with this increase. The succession of groups based on feeding behavior seemed to correspond with stress in eutrophication along the salinity gradient and in different estuarine parts. In addition, the economic clam population decreased noticeably during the medium-loading period, as a consequence of deteriorated sediment conditions. Thus, the land-based runoff should be controlled for the protection of resources. Further effective sustainable management will be enhanced by giving serious consideration to an eco-based zoning scheme for conservation and restoration of the Tha Chin estuary.

scholarly journals THREATENED FISHES OF THE WORLD: Mastacembelus armatus (Lacepede, 1800) (Synbranchiformes: Mastacembelidae)

2015 ◽  
Vol 73 (3) ◽  
pp. 137-139 ◽  
Author(s):  
Md. Yeamin Hossain ◽  
Md. Alomgir Hossen ◽  
Khairun Yahya ◽  
Zoarder Faruque Ahmed ◽  
Md. Rafiqul Islam Sarder ◽  
...  
Keyword(s):  
The World ◽  
Threatened Fishes ◽  
Mastacembelus Armatus

scholarly journals Implication of Climate Change On Crop Water Requirement: A Regional Case Study in The Semi-Arid Region of Western Maharashtra, India

2021 ◽  
Author(s):  
Shubham Anil Gade ◽  
Devidas D Khedkar
Keyword(s):  
Climate Change ◽  
Water Management ◽  
Hydrological Cycle ◽  
Monsoon Season ◽  
Water Requirement ◽  
Crop Water Requirement ◽  
Present Condition ◽  
Crop Evapotranspiration ◽  
Crop Water ◽  
Reanalysis Dataset

Abstract The hydrological cycle has been massively impacted by climate change and human activities. Thus it is of the highest concern to examine the effect of climate change on water management, especially at the regional level, to understand possible future shifts in water supply and water-related crises, and to provide support for regional water management. Fortunately, there arises a high degree of ambiguity in determining the effect of climate change on water requirements. In this paper, the Statistical DownScaling (SDSM) model is applied to simulate the potential impact of climate on crop water requirement (CWR) by downscaling ET0 in the region of Western Maharashtra, India for the future periods viz., 2030s, 2050s, and 2080s across three meteorological stations (Pune, Rahuri, and Solapur). Four crops i.e. cotton, soybean, onion, and sugarcane are selected during the analysis. The Penman-Monteith equation is used to calculate reference crop evapotranspiration (ET0), which further in conjunction with the crop coefficient (Kc) equation is used to calculate crop evapotranspiration (ETc) / CWR. The predictor variables are extracted from the NCEP reanalysis dataset for the period 1961-2000 and the HadCM3 under H3A2 and H3B2 scenarios for the period of 1961 – 2099. The results indicated by SDSM profound good applicability in downscaling due to satisfactory performance during calibration and validation for all three stations. The projected ET0 indicated an increase in mean annual ET0 as compared to the present condition during the 2030s, 2050s, and 2080s. The ET0 would increase for all months (in summer, winter, and pre-monsoon seasons) and decrease from June to September (monsoon season). The estimated future CWR show variation in the range for cotton (-0.97 to 2.48%), soybean (-2.09 to 1.63 %), onion (0.49 to 4.62 %), and sugarcane (0.05 to 2.86 %).

STUDY OF A NEW TAPEWORM, APICOBOTHRIUM BHARUAENSIS N.G.,N.SP. FROM, MASTACEMBELUS ARMATUS FROM BLOCK BHARUA DISTRICT HAMIRPUR (U.P.) INDIA

2018 ◽  
Vol 24 (1) ◽  
Author(s):  
ROOPAL SINGH ◽  
ABHA RAJ SINGH
Keyword(s):  
Apical Disc ◽  
Mastacembelus Armatus

Eight fishes, Mastacembelus armatus were purchased from block Bharua, district Hamirpur (U.P.) India . Two alike cestodes were reported in its intestine. Scolex elongated with two elongated spined bothria. Apical disc armed with bothrial spines. Ovary bilobed, medial and post equatorial.

PREVALENCE OF PSEUDOINVERTA ORAIENSIS IN FRESH WATER FISH, CLARIAS BATRACHUS

2019 ◽  
Vol 25 (1) ◽  
Author(s):  
ADITYA NARAYAN
Keyword(s):  
Fresh Water ◽  
Monsoon Season ◽  
Winter Season ◽  
Uttar Pradesh ◽  
Summer Season ◽  
Clarias Batrachus ◽  
Fresh Water Fish ◽  
Water Fish

The present investigation deals with the prevalence of infection of cestode, Pseudoinverta oraiensis19 parasitizing Clarias batrachus from Bundelkhand Region (U.P.) India. The studies were recorded from different sampling stations of Bundelkhand region of Uttar Pradesh. For this study 360 fresh water fish, Clarias batrachus were examined. The incidence of infection, monsoon season (17.50%) followed by winter season (20.00%) whereas high in summer season (30.00%).

Khandut revisited: Monuments, shrines, and newly discovered rock art in Wakhan District

Afghanistan ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. 282-301
Author(s):  
John Mock
Keyword(s):  
Central Asia ◽  
Rock Art ◽  
Field Work ◽  
Present Condition ◽  
Current Article

In 1972, a brief article titled “Khandud, Village de la Vallée du Wakhan” appeared in Afghanistan 25. The subsequent decades of conflict precluded any follow-up research in Wakhan. The current article, based on field work from 2004 to 2016, examines the present condition of the sites described in 1972, offers a revised analysis of their significance, and introduces newly discovered rock art that connects Wakhan with the Saka culture of Central Asia and illustrates indigenous traditions of the Pamir-Hindukush ethnolinguistic region.

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