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Articles by Subrata Mondal
Total Records ( 3 ) for Subrata Mondal
  Subrata Mondal , Abdul Wahab , Benoy Kumar Barman and Abdulla- Al-Asif
  Background and Objective: The mola carplet, Amblypharyngodon mola is a representative small indigenous fish species that is enriched with different vitamins and minerals. The main objective of this study was to determine the reproductive biology of A. mola for better scientific management and conservation in hapa based culture, set up in a large earthen pond. Materials and Methods: The experiment was conducted of three treatment with two replicates along hapa size varied treatment: T1 (2 m3), treatment: T2 (10 m3) and treatment: T3 (20 m3) with two replicates each and the stocking density in those hapas were 50, 250 and 500g, respectively in April, 2012 to March, 2013. Some biological characteristics, gonad weight, Gonadosomatic Index (GSI) and condition factor (K) of both sexes were observed. Results: Cycle of gonadal maturation and month-wise variations were documented with their fecundity, size-frequency of intra-ovarian oocytes in females. Throughout the suitable physic-chemical parameters, monthly microscopic examination of gonad revealed five maturity stages of female A. mola but male showed same four stages. Ripe ova have been observed for nine consecutive months (April to December) which referring extended the breeding season. Considering the stocking density and hapa sizes, A. mola bred the highest frequency in T3 during the culture period. Different size classes of intraovarian oocytes have portrayed the batch-wise (asynchronous) development of oocytes in A. mola throughout the culture period. Conclusion: This evidence suggests that A. mola has its inherent regulating mechanism of oocyte development adapted to the annual life of the fish, in spite of their single spawning habit, they discharge all oocytes in different batches throughout the spawning season.
  Md. Mer Mosharraf Hossain , Md. Imtiaz Uddin , Md. Ariful Haque Rupom , Jannatul Ferdoush , Md. Monjur Hossain , Subrata Mondal and Md. Anisur Rahman
  Background and Objectives: To improve the sustainable management and control of North American, western mosquitofish (Gambusia affinis) in the freshwater of Bangladesh, the most invasive to indigenous species, caused the severe infestation to all carps, genetic diversity of the species were studied using DNA sequences of nucleotides first time in Bangladesh. This study was aimed to develop molecular detection method to confirm the G. affinis in freshwater and construct a genetic baseline to control this species. Materials and Methods: This study consisted of 6 microsatellites nuclear DNA loci that were used for the construction of a genetic baseline used a gene-specific marker (cytb). A total of 6 fish for 6 sites were used for DNA extraction, then genotyped and analyzed to examine genetic diversity to assess the persistence of a species in the environment. Results: Genetic diversity was inferred as some polymorphism and monomorphism with minimal genetic distance, in which a UPGMA dendrogram showed the same cluster. MEGA X [3] computes pairwise distance (0.01) and overall mean distance (0.01) of substitution type is nucleotides between a query and the database sequences were constructed. The optimal tree with the sum of branch length = 0.036 showed a homogenous pattern among lineages. Conclusion: This study confirms the limited genetic diversity of G. affinis, across 6 sampling sites which might be used in the future to control mosquitofish (G. affinis) and the propagation of its parasitic Lernaea sp.
  Md. Ayenuddin Haque , Md. AbuSayed Jewel , Zannatul Ferdoushi , Moni Begum , Md. Iqbal Husain and Subrata Mondal
  Background and Objective: Surface water of Bangladeshi is now in a great concern through the contamination with heavy metals. Therefore, characterization of carcinogenic and non-carcinogenic health risk due to the use of this water is a demand of time. This study aimed to determine levels of heavy metals in surface water of Padma river (Northwestern Bangladesh) and to estimate human health risk associated with the use of water from this River via. ingestion and dermal exposure. Materials and Methods: 4 study sites in Padma river were selected for sampling during 3 study seasons (summer, monsoon and winter). The concentration of heavy metals (Cr, Pb, Ni, Cd, As, Cu and Zn) of the water samples were determined by Flame Atomic Absorption Spectrometer. Results: The mean concentration of metals investigated during the study period was Cr (0.038 mg L–1), Pb (0.009 mg L–1), Ni (0.004 mg L–1), Cd (0.005 mg L–1), As (0.003 mg L–1), Cu (0.012 mg L–1) and Zn (0.030 mg L–1). The Hazard Quotient (HQ) and Hazard Index (HI) for both the child and the adult via. ingestion and dermal contact were less than one except for the child, whereas HI value via. ingestion was greater than one indicating an unacceptable risk of non-carcinogenic effects on health. Carcinogenic Risk (CR) due to use of water of Padma river ranged between 4.63×10–7 (Pb) to 1.75×10–4 (Cd) and 4.96×10–7 (Pb) to 1.87×10–4 (Cd) for the child and the adult, respectively. The cumulative cancer risk for both the child and the adult indicates medium-high risk for the studied metals according to the Delphi method. Conclusion: The health risk assessment of the heavy metals content in Padma river indicating minor adverse health risk effects but suggests caring about the risk status and to its remediation process.
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