scholarly journals Abundance and distribution of endoparasitic helminths in Anabas testudineus (Bloch, 1792) from a polluted beel of Bangladesh

2015 ◽  
Vol 42 (1) ◽  
pp. 1-10
Author(s):  
Aminul Islam Bhuiyan ◽  
Jannatul Bushra ◽  
Osman Ghani
Keyword(s):  
Distribution Pattern ◽  
Water Body ◽  
Significant Positive Correlation ◽  
Random Distribution ◽  
Polluted Water ◽  
Anabas Testudineus ◽  
Nematode Parasites ◽  
Abundance And Distribution ◽  
Satellite Species ◽  
Species Category

Abundance and distribution of the endoparasitic helminths in Anabas testudineus (collected from a polluted water body) was analyzed. Out of 50 fish observed, 42 (84%) were parasitized by at least one species. Five metazoan endoparasites, one trematode (Neopecoelina saharanpuriensis) and four nematodes (Ascaridida sp., Contracaecum sp., Camallanus anabantis and C. pearsei) were recorded. Prevalence was higher in female (90%) hosts than males (75%). A significant positive correlation was observed between the standard length of the host and the abundance for parasites except Ascaridida sp. Nematodes were the more prevalent group (72%) than trematodes (48%). No parasitic species was observed as central species category; three parasites (N. saharanpuriensis, Ascaridida sp. and Contracaecum sp.) were considered as secondary and Camallanus spp. as satellite species. All nematode parasites showed aggregated distribution pattern and the trematode showed random distribution pattern. Interspecies association between two species of parasite was low.Bangladesh J. Zool. 42(1): 1-10, 2014

scholarly journals Community structure analysis of endoparasitic helminths of Anabas testudineus (Bloch, 1792) from a fresh water body of Bangladesh

2014 ◽  
Vol 40 (1) ◽  
pp. 67-77
Author(s):  
Aminul Islam Bhuiyan ◽  
Md Osman Ghani ◽  
Jannatul Bushra
Keyword(s):  
Community Structure ◽  
Distribution Pattern ◽  
Fresh Water ◽  
Water Body ◽  
Random Distribution ◽  
Parasite Species ◽  
Parasite Diversity ◽  
Anabas Testudineus ◽  
Satellite Species ◽  
Species Category

Community structure of the parasites of Anabas testudineus was analyzed collected from a fresh water body, Turag River at Diabari, Mirpur point of Dhaka, Bangladesh. Out of 50 A. testudineus fish observed, 36 (72%) were parasitized by at least one species of helminth endoparasites. Six metazoan endoparasites were recorded: two trematodes (Allocreadium minutum, Neopecoelina saharanpuriensis) and four nematodes (Ascaridida sp., Gnathostoma spinigerum, Contracaecum sp., Paragendria wallagonia). Prevalence was higher in female (81.25%) hosts than male (55.56%). Nematode was more prevalent group (70%) than trematode (62%). All parasite species were accounted as secondary species category; no central or satellite species accounted in the sample. A significant positive correlation was observed between the standard length of the host with the prevalence and abundance of all parasites in this sample fishes. Two parasites (A. minutum and Ascaridida sp.) showed typical over-dispersed distribution pattern and other four parasites (N. saharanpuriensis, G. spinigerum, Contracaecum sp. and P. wallagonia) showed random distribution pattern. Interspecies association between two species of parasite was moderately strong. The host’s sex did not affect the parasite diversity and abundance.J. Asiat. Soc. Bangladesh, Sci. 40(1): 67-77, June 2014

scholarly journals Community structures of endoparasitic helminths of Channa punctatus from a fresh water river and a polluted lagoon of Bangladesh

2012 ◽  
Vol 39 (2) ◽  
pp. 173-185 ◽  
Author(s):  
Md. Osman Ghani ◽  
Aminul Islam Bhuiyan
Keyword(s):  
Fresh Water ◽  
Standard Length ◽  
Significant Positive Correlation ◽  
Parasite Species ◽  
Channa Punctatus ◽  
Dhaka City ◽  
Community Structures ◽  
Richness Index ◽  
Satellite Species ◽  
Species Category

Community structures of the parasites of Channa punctatus collected from fresh water Ichamoti river (IR) and a polluted sewerage treatment lagoon (SL) near Dhaka city were determined. Out of the total 104 C. punctatus fish observed, 78.85% were parasitized by at least one species of helminth endoparasites. Twelve metazoan endoparasite (viz. six trematodes, one cestode, three nematodes and two acantho-cephalans) were recorded. Neopecoelina saharanpuriensis, Pallisentis nandai, P. ophiocephali, Ascaridia sp. were common in both sites. Euclinostomum heterostomum, an unidentified digenean, Genarchopsis ozakii, Gangesia bengalensis, Buckleynema channi were recorded from IR and Genarchopsis bangladensis, Phyllodistomum chauhani, Camallanus intestinalus from the SL fishes. Trematode was the most prevalent group and had 63.46% and 53.85% prevalence in IR and SL sample fishes, respectively. Among the parasites of IR sample, only E. heterostomum was accounted as secondary and others fall in the satellite species category; no central species accounted in the sample. In case of SL sample, no parasite species found central, Pallisentis spp. could be considered secondary and others as satellite species. A significant positive correlation was observed between the standard length of the host, and the abundance and prevalence found only for Pallisentis spp. in SL fishes, and between the standard length and the abundance of the Ascaridia sp. in IR fishes. The larger hosts were more infected than the smaller hosts. Parasites of the fish of both sites showed typical over-dispersed distribution pattern in both the sites. No parasite showed random or uniform distribution in both the sample fishes. Parasite species richness index was lower in SL sample. Prevalence and intensity were higher in both sexes in SL sample than those of in IR sample.DOI: http://dx.doi.org/10.3329/bjz.v39i2.10584 Bangladesh J. Zool. 39(2): 173-185, 2011 

scholarly journals Oxygen Regime Control in Water Body Amelioration

2019 ◽  
Vol 97 ◽  
pp. 05029
Author(s):  
Valery Borovkov ◽  
Ivan Karaichev
Keyword(s):  
Water Body ◽  
Water Mass ◽  
Practical Importance ◽  
Water Bodies ◽  
World Health ◽  
Polluted Water ◽  
Air Bubbles ◽  
Oxygen Regime ◽  
Discharge Velocity ◽  
Dimensionless Groups

An important aspect of water body amelioration is the control of the oxygen regime in water mass. Pollution of water bodies deteriorates their oxygen regime, and the natural inflow of oxygen through the free surface is not enough to compensate for oxygen consumption for pollutant oxidation. Water pollution by various substances causes damage resulting from a decrease in the ecological safety of urban water bodies. Data of World Health Organization (WHO) show that the contact of the population with polluted water bodies causes spreading of deceases, such as cholera, diarrhea, dysentery, hepatitis A, typhoid, and poliomyelitis, and creates considerable health risks. In this context, the artificial aeration of water mass with the use of aeration systems, which improve water quality, is gaining in importance. Most widespread among such aeration systems are diffused-air aerators, in which air supplied by a compressor passes through perforated diffuser plates. The size of the perforation is often chosen with no appropriate hydraulic substantiation. The size of the resulting air bubbles, no doubt, depends on the size of perforation holes; however, the available design relationships give contradictory results depending on the immersion depth of the diffuser plate and the working pressure, which determines air discharge velocity from diffuser plate perforations. This shows that the studies along this line are of scientific and practical importance. This article presents the analysis of the existing relationships for determining the size of air bubbles that form when air is pumped into water through nozzles of different diameters at different pumping rates; the analysis has shown the results of such calculations to differ considerably. Buckingham π-theorem was used to construct dimensionless groups, determining the relationship between the size of bubbles and the factors that govern the outflow of air into water. Dimensionless groups were used to obtain a formula for calculating the size of air bubbles at the aeration of water mass.

scholarly journals Determination of the 1,3- and 2-Positional Distribution of Fatty Acids in Olive Oil Triacylglycerols by 13C Nuclear Magnetic Resonance Spectroscopy

2006 ◽  
Vol 89 (4) ◽  
pp. 1071-1076 ◽  
Author(s):  
Giovanna Vlahov
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fatty Acid ◽  
Nmr Spectroscopy ◽  
Magnetic Resonance ◽  
Olive Oil ◽  
Distribution Pattern ◽  
Random Distribution ◽  
Linear Models ◽  
13C Nuclear Magnetic Resonance ◽  
Nuclear Magnetic

Abstract Linear models were selected from a large data set acquired for Italian olive oil samples by quantitative 13C nuclear magnetic resonance (NMR) spectroscopy with distortionless enhancement by polarization transfer (DEPT). The models were used to determine the composition of the 2 fatty acid pools esterifying the 1,3- and 2-positions of triacylglycerols. The linear models selected proved that the 1,3- and 2-distribution of saturated, oleate, and linoleate chains in olive oil triacylglycerols deviated from the random distribution pattern to an extent that depended on the concentration of the fatty acid in the whole triacylglycerol. To calculate the fatty acid composition of the 1,3- and 2-positions of olive oil triacylglycerols, the equations of the selected linear models were applied to the fatty acid percentages determined by gas chromatography. These data were compared with the values predicted by the computer method (used to determine the theoretical amounts of triacylglycerols), which is based on the 1,3-random-2-random theory of the fatty acid distribution in triacylglycerols. The biggest differences were found in the linoleate chain, which is the chain that deviated the most from a random distribution pattern. The results confirmed that the 1,3-random-2-random distribution theory provides an approximate method for determining the structure of triacylglycerols; however, the linear models calculated by the direct method that applies 13C NMR spectroscopy represent a more precise measurement of the composition of the 2 fatty acid pools esterifying the 1,3- and 2-positions of triacylglycerols.

scholarly journals Recognition of Water Colour Anomaly by Using Hue Angle and Sentinel 2 Image

2020 ◽  
Vol 12 (4) ◽  
pp. 716 ◽  
Author(s):  
Yelong Zhao ◽  
Qian Shen ◽  
Qian Wang ◽  
Fan Yang ◽  
Shenglei Wang ◽  
...  
Keyword(s):  
Remote Sensing ◽  
Water Body ◽  
Large Scale ◽  
Measured Data ◽  
Water Bodies ◽  
Polluted Water ◽  
Water Colour ◽  
Hue Angle ◽  
Anomalous Water ◽  
Sentinel 2

As polluted water bodies are often small in area and widely distributed, performing artificial field screening is difficult; however, remote-sensing-based screening has the advantages of being rapid, large-scale, and dynamic. Polluted water bodies often show anomalous water colours, such as black, grey, and red. Therefore, the large-scale recognition of suspected polluted water bodies through high-resolution remote-sensing images and water colour can improve the screening efficiency and narrow the screening scope. However, few studies have been conducted on such kinds of water bodies. The hue angle of a water body is a parameter used to describe colour in the International Commission on Illumination (CIE) colour space. Based on the measured data, the water body with a hue angle greater than 230.958° is defined as a water colour anomaly, which is recognised based on the Sentinel-2 image through the threshold set in this study. The results showed that the hue angle of the water body was extracted from the Sentinel-2 image, and the accuracy of the hue angle calculated by the in situ remote-sensing reflectance Rrs (λ) was evaluated, where the root mean square error (RMSE) and mean relative error (MRE) were 4.397° and 1.744%, respectively, proving that this method is feasible. The hue angle was calculated for a water colour anomaly and a general water body in Qiqihar. The water body was regarded as a water colour anomaly when the hue angle was >230.958° and as a general water body when the hue angle was ≤230.958°. High-quality Sentinel-2 images of Qiqihar taken from May 2016 to August 2019 were chosen, and the position of the water body remained unchanged; there was no error or omission, and the hue angle of the water colour anomaly changed obviously, indicating that this method had good stability. Additionally, the method proposed is only suitable for optical deep water, not for optical shallow water. When this method was applied to Xiong’an New Area, the results showed good recognition accuracy, demonstrating good universality of this method. In this study, taking Qiqihar as an example, a surface survey experiment was conducted from October 14 to 15, 2018, and the measured data of six general and four anomalous water sample points were obtained, including water quality terms such as Rrs (λ), transparency, water colour, water temperature, and turbidity.

scholarly journals Community structure analysis of endoparasitic helminths of Anabas testudineus from unpolluted and polluted sites of a freshwater body of Dhaka

2014 ◽  
Vol 23 (1) ◽  
pp. 27-38
Author(s):  
Md Osman Ghani ◽  
Aminul Islam Bhuiyan ◽  
Jannatul Bushra
Keyword(s):  
Community Structure ◽  
Parasite Species ◽  
Parasite Community ◽  
Community Diversity ◽  
Polluted Water ◽  
Component Community ◽  
Anabas Testudineus ◽  
Host Sex ◽  
Host Habitat ◽  
Insignificant Difference

Community structure of metazoan endoparasites of Anabas testudineus collected from an unpolluted and a polluted water body was determined. Out of 100 A. testudineus observed, 78% was parasitized by at least one species of endohelminth parasite. Eight metazoan endoparasites were recorded. Nematode showed higher prevalence than trematode. One species was accounted as satellite species and others as secondary. Larger hosts were more abundantly infected than the smaller ones as positive correlation was observed between the standard length of the hosts and the abundance/ prevalence of all parasites. Maximum parasite species followed a typical overdispersed type of distribution pattern. Parasite species richness was lower in fish from polluted (4) than unpolluted water (6). Per cent similarity of infestation between the sample hosts was high (55.73%). Three common parasite species from both sample hosts showed insignificant difference in intensity of infestation in relation to host habitat. Host sex had influenced infestation at infra?community but not at component community level. Interspecies association between parasites was strong in fish from unpolluted in comparision from polluted water. Host’s habitat quality also played an influential role in building parasite community, diversity and other associated community indices. DOI: http://dx.doi.org/10.3329/dujbs.v23i1.19823 Dhaka Univ. J. Biol. Sci. 23(1): 27-38, 2014

scholarly journals DIVERSE APPROACHES TO MODELLING THE ASSIMILATIVE CAPACITY OF A POLLUTED WATER BODY

2015 ◽  
Vol 35 (1) ◽  
pp. 196
Author(s):  
CM Chiejine ◽  
AC Igboanugo ◽  
LIN Ezemonye
Keyword(s):  
Water Body ◽  
Polluted Water ◽  
Assimilative Capacity

scholarly journals POLA SEBARAN UNDUR-UNDUR LAUT (Hippidae) BERDASARKAN SALINITAS SUBSTRAT DI PANTAI PAGAK, KEC. NGOMBOL, PURWOREJO, JAWA TENGAH (Distribution Pattern of Mole Crab (Hippidae) Based on The Substrat’s Salinity in Pagak Beach, Ngombol District, Purworejo Regency, Central Java)

2018 ◽  
Vol 14 (1) ◽  
pp. 16
Author(s):  
Setiaji Nugroho ◽  
Suryanti Suryanti ◽  
Siti Rudiyanti
Keyword(s):  
Distribution Pattern ◽  
Sampling Technique ◽  
Southern Coast ◽  
Purposive Sampling ◽  
Central Java ◽  
Abundance And Distribution ◽  
The Relationship ◽  
Group Pattern ◽  
Potential Area ◽  
Selection Of

 Pesisir selatan Jawa, khususnya pantai Pagak, Kabupaten Purworejo merupakan daerah potensial dengan beragam jenis biota yang seringkali dimanfaatkan masyarakat setempat sebagai bahan makanan. Biota tersebut diantaranya adalah yutuk (undur-undur laut) yang bermanfaat secara ekologis maupun ekonomis, namun pemanfaatan belum optimal. Penelitian ini bertujuan untuk mengetahui kelimpahan dan pola sebaran undur-undur laut sebagai dasar pemilihan daerah penangkapan undur-undur laut dan hubungan salinitas substrat dengan kelimpahan undur-undur laut yang ada di pantai Pagak, Kabupaten Purworejo. Penelitian dilakukan pada bulan Januari 2018. Pengambilan sampel biota dan substrat dilakukan pada tiga stasiun dimana setiap stasiun dilakukan tiga kali pengulangan pada hari yang berbeda. Pengambilan sampel menggunakan teknik purposive sampling. Hasil penelitian menunjukkan kelimpahan undur-undur laut (hippidae) di pantai Pagak berkisar 2-4 individu/m2 dengan pola sebaran yang mengelompok. Kelimpahan tersebut cenderung lebih tinggi pada salinitas substrat kisaran 33-35 ppt. Salinitas substrat berpengaruh terhadap kelimpahan undur-undur laut (hippidae) di pantai Pagak dan keduanya mempunyai hubungan yang lemah (r = 0,371). Southern coast of Java, especially Pagak beach, Purworejo Regency is a potential area with various types of biota that are often used by local people as food. One of the biota is mole crab that is useful ecologically and economically, while the existing utilization is not yet optimal and sustainable. The purpose of this research is to know the abundance and distribution pattern of mole crab as the basis for the selection of good and sustainable fishing areas of mole crab, and the relationship between substrate salinity and the abundance of mole crab at Pagak beach, Purworejo Regency. The study was conducted in January 2018. Samples collection of biota and substrate were conducted at three stations where each station was carried out with three replication on different days. Purposive sampling technique was used to take the sample. The results showed the abundance of mole crab (hippidae) at Pagak beach ranged from 2 to 4 individuals / m2 with a group pattern of distribution. The abundance tends to be higher in the substrate salinity of 33-35 ppt range. Substrate salinity and abundance of mole crab have weak relationships

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