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Population dynamics of Japanese threadfin bream Nemipterus japonicus from Pakistani waters

Acta Oceanologica Sinica 2014年第10期33卷 49-57页

作者： KALHORO Muhsan Ali LIU Qun memon khadim hussain CHANG Mohammad Saleem ZHANG Kui College of Fisheries Ocean University of China Marine Fisheries Department Fish Harbor west wharf KarachiKarachi 74000 Pakistan Department of Zoology University of SindhJamshoro 76080 Pakistan

Japanese threadfin bream Nemipterus japonicus（Bloch, 1791） is among the most abundant and commercially important species in Pakistan. From the coast of Pakistan, four demersal trawl surveys in October–November 2009 and May–June, August, October and November in 2010 were carried out. The purpose of this study is to estimate the population dynamics and status of the stock of the N. japonicus from Pakistani waters based on the research trawl surveys from the research area. The data consist of n=784 length-weight pairs and n=7 530 length frequency with the maximum length and weight of 29 cm and 358 g respectively. The length frequency data were analyzed using ELEFAN method in FiSAT computer package. The parameters of length and weight relationship were b=2.778, a=0.032 and R2=0.973. The estimated von Bertalanffy growth function parameters were L∞=30.45 cm, K=0.270 year-1. Based on length-converted catch curve analysis the total mortality（Z） during this study was estimated at 0.960 year-1. The natural mortality coefficient（M） was 0.74 year-1 using Pauly＇s equation（the annual average sea surface temperature was 27°C）, therefore, the fishing mortality coefficients（F） were 0.22 year-1. The yield per recruit analysis indicated that when tc was 2, Fmax was estimated at 1.2 and F0.1 at 1.1. When tc was 1, Fmax was estimated at 0.95 and F0.1 at 0.8. Because current age at first capture is about 1 year and Fcurrent was 0.22, Fcurrent is smaller than F0.1 and Fmax, which indicated that the fishery is about in a safe condition. When using Gulland（1971） biological reference point, Fopt was equals to M（0.74）. The current fishing mortality rate of 0.22 was smaller than the target biological reference point.

关键词： Pakistan Nemipterus japonicus length-weight relationship growth mortality

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Maximum sustainable yield of Greater lizardfish Saurida tumbil fishery in Pakistan using the CEDA and ASPIC packages

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Acta Oceanologica Sinica 2015年第2期34卷 68-73页

作者： KALHORO Muhsan Ali LIU Qun memon khadim hussain WARYANI Baradi SOOMRO Shamsher Hyder College of Fisheries Ocean University of China Marine Fisheries Department Fish Harbor West Wharf Karachi Department of Freshwater Biology and Fisheries University of Sindh

The catch and effort data analysis（CEDA） and ASPIC（a stock assessment production model incorporating covariates） computer software packages were used to estimate the maximum sustainable yield（MSY） from the catch and effort data of Greater lizardfish Saurida tumbil fishery of Pakistan from 1986 to 2009. In CEDA three surplus production models of Fox, Schaefer and Pella-Tomlinson were used. Here initial proportion（IP） of 0.5 was used because the starting catch was roughly 50% of the maximum catch. With IP = 0.5, the estimated MSY from Fox model were 20.59 mt and 38.16 mt for normal and log-normal error assumptions, while the MSY from Schaefer and Pella-Tomlinson were 60.40, 60.40 and 60.40 mt, for normal, log-normal and gamma error assumptions respectively. The MSY values from Schaefer and Pella-Tomlinson models of three error assumptions were the same. The R2 values from those three models were above 0.6. When IP = 0.5, the MSY values estimated from ASPIC from Fox were 132 mt, and from logistic model were 69.4 mt, with R2 value above 0.8. Therefore we suggest the MSY of S. tumbil fishery from Pakistan to be 60–70 mt, which is higher than the latest catch, thus we would recommend that the fishing efforts for this fishery may be kept at the current level.

关键词： Pakistan Sauridatumbil ASPIC CEDA MSY

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Evaluation of the fishery status for King Soldier Bream Argyrops spinifer in Pakistan using the software CEDA and ASPIC

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Chinese Journal of Oceanology and Limnology 2015年第4期33卷 966-973页

作者： Aamir Mahmood memon 刘群 khadim hussain memon Wazir Ali BALOCH Asfandyar memon Abdul BASET College of Fisheries Ocean University of China Sindh Fisheries Department Marine Fisheries Department Fish Harbor west wharf Karachi 74000 Pakistan Department of Fresh Water Biology and Fisheries University of Sindh Department of Economics Management and Quantitative Methods Via Conservatorio7 Universita Degli Studi Di Milano

Catch and effort data were analyzed to estimate the maximum sustainable yield （MSY） of King Soldier Bream, Argyrops spinifer （Forsskal, 1775, Family： Sparidae）, and to evaluate the present status of the fish stocks exploited in Pakistani waters. The catch and effort data for the 25-years period 1985-2009 were analyzed using two computer software packages, CEDA （catch and effort data analysis） and ASPIC （a surplus production model incorporating covariates）. The maximum catch of 3 458 t was observed in 1988 and the minimum catch of 1 324 t in 2005, while the average annual catch ofA. spinifer over the 25 years was 2 500 t. The surplus production models of Fox, Schaefer, and Pella Tomlinson under three error assumptions of normal, log-normal and gamma are in the CEDA package and the two surplus models of Fox and logistic are in the ASPIC package. In CEDA, the MSY was estimated by applying the initial proportion （IP） of 0.8, because the starting catch was approximately 80% of the maximum catch. Except for gamma, because gamma showed maximization failures, the estimated results of MSY using CEDA with the Fox surplus production model and two error assumptions, were 1 692.08 t （R^2=0.572） and 1 694.09 t （R^2=0.606）, respectively, and from the Schaefer and the Pella Tomlinson models with two error assumptions were 2 390.95 t （R^2=0.563）, and 2 380.06 t （R^2=0.605）, respectively. The MSY estimated by the Fox model was conservatively compared to the Schaefer and Pella Tomlinson models. The MSY values from Schaefer and Pella Tomlinson models were the same. The computed values of MSY using the ASPIC computer software program with the two surplus production models of Fox and logistic were 1 498 t （R^2=0.917）, and 2 488 t （R^2=0.897） respectively. The estimated values of MSY using CEDA were about 1 700-2 400 t and the values from ASPIC were 1 500-2 500 t. The estimates output by the CEDA and the ASPIC packages indicate that the stock is overfished, and needs some effective manage

关键词： stock assessment Argyrops spinifer maximum sustainable yield catch and effort data analysis (CEDA) a surplus production model incorporating covariates (ASPIC) Pakistan

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A continuous time delay-difference type model(CTDDM) applied to stock assessment of the southern Atlantic albacore Thunnus alalunga

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Chinese Journal of Oceanology and Limnology 2016年第5期34卷 977-984页

作者：廖宝超刘群张魁 Abdul BASET Aamir Mahmood memon khadim hussain memon 韩亚楠 Department of Fisheries Ocean University of China South China Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Marine Fisheries Department Fish HarborWest Wharf

A continuous time delay-difference model(CTDDM) has been established that considers continuous time delays of biological *** southern Atlantic albacore(Thunnus alalunga) stock is the one of the commercially important tuna population in the marine *** age structured production model(ASPM) and the surplus production model(SPM) have already been used to assess the albacore ***,the ASPM requires detailed biological information and the SPM lacks the biological *** this study,we focus on applying a CTDDM to the southern Atlantic albacore(***) species,which provides an alternative method to assess this *** is the first time that CTDDM has been provided for assessing the Atlantic albacore(***) *** obtained the 80%confidence interval of MSY(maximum sustainable yield) of(21 510 t,23 118 t).The catch in 2011(24 100 t) is higher than the MSY values and the relative fishing mortality ratio(F_(2011)/F_(MSY)) is higher than *** results of CTDDM were analyzed to verify the proposed methodology and provide reference information for the sustainable management of the southern Atlantic albacore *** CTDDM treats the recruitment,the growth,and the mortality rates as all varying continuously over time and fills gaps between ASPM and SPM in this stock assessment.

关键词： continuous time delay-difference model(CTDDM) Southern Atlantic Thunnus alalunga maximum sustainable yield(MSY) biological reference points(BRPs)

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Evaporated Thin Films of CdS and CdTe: Optimization for Photovoltaic Applications

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Journal of Materials Science & Technology 1996年第2期12卷 89-94页

作者： Shahzad Naseem Dilawaiz Nazir Riffat Mumtaz khadim hussain Centre for Solid State Physics University of the PunjabQuaid-e-Azam CampusLahore-54590Pakistan

Thin films of cadmium sulphide and cadmium telluride have been prepared by thermal evaporation under various conditions of deposition. These films have been characterized optically. electrically and for structure determination. The results of these characterizations along with the initial results of all thin film CdS/CdTe solar cells are presented in this paper

关键词： Evaporated Thin Films of CdS and CdTe Thin Optimization for Photovoltaic Applications CdS

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PREPARATION OF THERMALLY EVAPORATED CdTe THIN FILMS

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Chinese Physics Letters 1990年第11期7卷 510-513页

作者： Shahzad Naseem Naseer-ud-Din khadim hussain Centre for Solid State Physics University of the PunjabQuaidCampusLahorePakistan

Thin films of cadmium telluride were prepared by evaporating cadmium telluride powder in a vacuum of less than 10^(-4) *** substrate temperature was varied systematically from room temperature to 300℃.The results of optical and structural characterizations have revealed that the films posses a high value of absorption coefficient with a bandgap value m the range 1.475-1.769eV,and that the films are of cubic structure with a preferred orientation along(111)*** probe measurements have shown that resistivity of these films is affected by the change in substrate temperature,with the lowest value(12.6 Ω·cm)being at 200℃.

关键词： films value cadmium

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Microwaves spark emission spectroscopy for the analysis of cations:A simple form of atomic emission spectroscopy

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Chinese Chemical Letters 2011年第9期22卷 1084-1086页

作者： Zahid hussain Khalid Mohammed Khan khadim hussain Sadam hussain Shahnaz Perveen Department of Chemistry Abdul Wali Khan UniversityMardanPakistan H.E.J.Research Institute of Chemistry International Center for Chemical and Biological SciencesUniversity of KarachiKarachi 75270Pakistan Department of Chemistry Hazara UniversityMansehraPakistan Department of Electronics Quaid-I-Azam UniversityIslamabadPakistan PCSIR Laboratories Complex Shahrah-e-Dr.Salimuzzaman SiddiquiKarachi 75280Pakistan

A novel method for the cation analysis was investigated. The analysis is based on the sparking of the salts of metals in a microwave oven after placing in a graphite cell. The graphite cell absorbs microwaves and produces high temperature which converts the salt into light emitting species. The colour of light was found to dependent on the nature of cation, however, the intensity of the emitted light was found to be depending upon the form and shape of the graphite assembly in addition to the concentration of the salt. This communication presents explanation for all these observations and for the systematic and quantitative analysis using microwave spark emission technique.

关键词： Microwave spark Cation analysis Spark colour Graphite cell Atomic emission

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Quantification of Phases in Lahore (Pakistan) Airborne Particulates by Matrix-Flushing Method

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Journal of Minerals and Materials Characterization and Engineering 2013年第4期1卷 168-183页

作者： Naveed Ahmad khadim hussain Shahzad Naseem Centre for High Energy Physics University of the Punjab New Campus Lahore Pakistan Centre for Solid State Physics University of the Punjab New Campus Lahore Pakistan Department of Physics GC University Lahore Pakistan

The mass concentrations of eighteen airborne samples collected from Lahore (Pakistan) are found in the range from 595 to 3027μg/m3with average value of 1130 μg/m3. Most of these values are normal and as reported in the literature for other parts of the world. The major phases identified in the samples by the X-ray powder diffraction technique are Albite (Anorthite), Calcite, Clinochlore (Chlorite), Gypsum, Illite, Quartz and Talc which have also been reported by other researchers to be present in the airborne particulates of other world locations. The average weight percentages of the phases (minerals) in the samples are respectively 15.5, 10.6, 23.7, 2.4, 19.1, 20.2, and 8.5. Some of the elements (e.g., boron, cadmium, lithium, manganese, titanium, and zinc) quantified in two samples determined using a spark-source mass spectrometer appear also to derive their origin from man-made activities. However no compound synthesized in the atmosphere is detected by the X-ray diffraction method.

关键词： Airborne Particulates GFC Filters Mass Concentration Matrix-Flushing Method Mass Spectrometry

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