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Articles by Yusuf Sharif Ahmed Khan
Total Records ( 6 ) for Yusuf Sharif Ahmed Khan
  Mohammed Ashraful Azam Khan and Yusuf Sharif Ahmed Khan
  Six experiments were conducted to assess losses, magnitude of infestation and to develop preventive measures for 12 weeks to combat the beetles infestation on sun dried ribbon fish by treating with pirimiphos-methyl at a concentration dose of 0.12, 0.06 and 0.03%, saturated brine solution and dried ‘Bishkatali’ (Polygonum hydropiper) plants. For comparative studies a batch of ribbon fish was also stored without any treatment as a control. The treatment of 0.12 and 0.06% pirimiphos-methyl showed excellent result against beetles infestation during storage, while the control suffers from effective weight loss of about -25.47% instead of increase due to rise of moisture content. The 0.12 and 0.06% pirimiphos-methyl treated fish showed weight change of +2.94 and -0.96% respectively, which were economic to the traders.
  Mohammed Ashraful Azam Khan and Yusuf Sharif Ahmed Khan
  The present study was undertaken to observe fish drying practice in the remote and isolated island of Bangladesh. Experiments were conducted to assess the cured loss of blowfly and its larva "Maggot" infestation, their diurnal activities and seasonal abundance on traditional sun drying of ribbon fish at field level. Experiments were carried out at a concentration of 0.12, 0.06 and 0.03% pirimiphos-methyl (organophosphorus) along with that "Nogos" of 0.25% (present practice) and saturated brine treatment in reducing blowfly infestation. The treatment of saturated brine and 0.03% pirimiphos-methyl gave comparatively good result (yield 41.5 - 41.6%) than control; whereas 0.12 and 0.06% pirimiphos-methyl treatment gave fair result (yield 42.7 - 43.2%), "Nogos" 0.25% treatment gave complete protection against blowfly infestation. Blowfly infestation on untreated control ribbon fish gave an yield 36.6% of about 5% less than the treated one.
  Mohammed Ashraful Azam Khan and Yusuf Sharif Ahmed Khan
  The composition of trace metals (Cd, Cu, Zn, Fe, Mn, Cr and Pb) in the sediments of the intertidal zone of ship breaking area of the north east coast of the Bay of Bengal has been determined using Flame Atomic Absorption Spectrophotometer. The mean values of trace metals are 0.88 μg.g‾1 for Cd, 32.91 μg.g‾1 I for Cu, 33.54 μg.g‾1 for Zn, 5272.13 μg.g‾1 for Fe, 556.10 μg.g‾1 for Mn, 78.09 μg.g‾1 for Cr and 23.18 μg.g‾1 for Pb. The levels of trace metals in the sediments of the study area have been compared with the recommended values unpolluted sediments. Correlations coefficients of different trace metals have ranged between 0.05 to 0.87 and it is observed that Cd is negatively correlated with virtually all the trace metals present. Geoaccumulations of metals indicate that, Cd is the most enriched metal followed by Pb and Cu. This high level of Cd indicates Cd might contaminate the sediments through anthropogenic sources. As per analysis and subsequent determinations, the beach of the ship breaking area has been indicated as polluted zone.
  Biplob Das , Yusuf Sharif Ahmed Khan , Pranab Das and Sakhawat Hossain Likhon
  The research deals with the study of the nature of hydrocarbons occurring at the coastal region of Bangladesh to assess the extent of hydrocarbon pollution in the marine environment. Accordingly, five sediment samples were analyzed for extraction of soluble organic matter, fractionation of extract into aliphatic hydrocarbons, aromatic hydrocarbons and polar compounds, molecular composition analysis of aromatic and aliphatic hydrocarbons’ fractions and integration of results for the study of the nature and origin of hydrocarbons in the marine environment. Hydrocarbons present in the sediment samples might have originated from three main sources: a) biosynthesis of aquatic organisms and/or diagenesis of alteration of bacteria, zooplankton, phytoplankton and higher plant derived organic matters; b) migration of immature oil seep from deeper sources and c) direct incorporation of fossil hydrocarbons discharged into the sea water by various sea-going vessels. The total hydrocarbons in five sediment samples from the study area ranged from 71.73 to 359.21ppm. Recommendations are made to take appropriate measure for the protection of the marine environment from further pollution.
  A.S.M. Saifullah , Md. Sayedur Rahman , Sardar M.A. Jabber , Yusuf Sharif Ahmed Khan and Nazim Uddin
  The present study reports the sex ratio and fecundity of four prawn species (Macrobrachium lamarrei, Macrobrachium malcolmsonii, Macrobrachium dolichodactylus and Macrobrachium dayanus) from the northeast (Sylhet, Maulavi Bazar and Sunamganj districts) and northwest (Pabna, Sirajganj and Natore districts) parts of Bangladesh. Females were more common than males in each species with male-female being 1:17.5, 1:1.1, 1:2.6 and 1:1.6, respectively, although this result was statistically significant only for the first species. Fecundity (mean ± SD) of the studied species was found to be 228 ± 69, 6234 ± 2390, 2187 ± 729 and 153 ± 22 eggs per female, respectively. Fecundity in all the species was found directly related to total length, standard length and total weight.
  A.S.M. Saifullah , Md. Sayedur Rahman and Yusuf Sharif Ahmed Khan
  In the present study fecundity of Hilsa ilisha (Hamilton, 1822) was estimated for 20 fully matured females from the Bay of Bengal, Bangladesh. The fecundity (F) was found to range from 10,30,951 to 19,40,620 (mean 13,77,884±2,90,145) in fishes between 39 and 51 cm total length (TL) with the mean of 44.08±3.84 cm. Standard length (SL), body weight (BW), gonad weight (GW), mean diameter of egg and Gonado Somatic Index (GSI) were found to range from 34 to 46 cm (mean 39.45±3.67), from 800 to 1,700 g (mean 1,155.50±260.76), from 71.15 to 217 g (mean 141.33±42.22), from 0.66 to 0.85 mm (mean 0.78±0.06) and from 7.5 to 15.85 (mean 12.15±2.19), respectively. The co-efficient of correlation for F/TL (F= 532.231 TL2.07 or, log F = 2.73 + 2.07 log TL), F/SL (F= 1,293.898 SL1.89 or, log F= 3.12+1.89 log SL), F/BW (F= 7,703.711 BW0.74 or, log F = 3.887+0.74 log BW) and F/GW (F= 71,186.887 GW0.60 or, log F= 4.85+0.60 log GW) were obtained as 0.86, 0.85, 0.82 and 0.94, respectively for the logarithmic scale. The regression line for the TL, SL, BW and GW of the fishes were found to be linear when they were plotted against their fecundity on logarithmic scales. Highly significant (p<0.05) linear relationship for logarithmic scale was obtained for all the variables. Body weight was found to be the best indicator of the fecundity of H. ilisha.
 
 
 
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