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Articles by Aziz Arshad
Total Records ( 9 ) for Aziz Arshad
  S. M. N. Amin , Aziz Arshad , Siti Shapor Siraj , B. Japar Sidik and M. Aminur Rahman
  Reproductive cycle, growth, mortality and exploitation rate of Acetes indicus were examined in the coastal waters of Malacca, Malaysia between February 2005 and March 2007. Monthly length frequency data were analyzed using FiSAT software for estimating population parameters of A. indicus, including asymptotic length (L∝), growth co-efficient (K) and exploitation rate (E) to assess the status of the stock. The annual mean L∝ and K for males were estimated at 29.93 mm and 1.60 yr-1, and for the females were 40.95 mm and 1.20 yr-1. Mean growth performance index (φ`) was calculated as 3.15 and 3.31 for males and females, respectively. Maximum life span (tmax) of males and females was 1.88 and 2.50 years. Total mortality (Z) by length converted catch curve was estimated at 4.30 yr-1 for males and 3.62 yr-1 for females. The rate of natural mortality (M) for males and females was calculated as 2.54 yr-1 and 1.93 yr-1, and the fishing mortality (F) was 1.77 yr-1 for males and 1.70 yr-1 for females. Recruitment pattern of A. indicus was continuous throughout the year with two major peaks. The exploitation rate (E) of males was 0.41 and that of females was 0.47, though the exploitation rates were slightly less than the optimum level of exploitation (E = 0.50). Thus, the stock of A. indicus is under pressure in the coastal waters of Malacca, Malaysia.
  Nur Leena Wong and Aziz Arshad
  A study was carried out to apply the induced spawning methods for a potential mariculture mussel species Modiolus philippinarum. Matured broodstock were collected from Merambong Shoal seagrass bed, Pulai River Estuary Johor and induced to spawn with two induced spawning methods. Mussels were successfully spawned after six hours of normal ambient exposure but failed to spawn when exposed to thermal cycling procedure. A total of 3.735x106 eggs were collected with an average of 81.07±3.42 μm in diameter. Early developments of M. philippinarum embryos were firstly recorded. First polar body was observed 10 min after fertilisation and early blastula with cilia was recorded 170 min after fertilisation. Embryos developed into late gastrulas after 5 h 30 min and early trochophores seen after 7 h. D-shaped veliger larvae with length averaged 99.51±9.98 μm and height averaged 81.87±8.14 μm (n = 30) were recorded after 27 h and only 23% of the eggs reached D-shaped veliger stage. Larval development ceased to progress on the third day into larval stage and failed to reach metamorphosis.
  Roushon Ara , Aziz Arshad , S.M.N. Amin , A.G. Mazlan and M. Aminur Rahman
  Larval stage of marine fishes, habitat characteristics, nursery and feeding ecology has been discussed in this review. Identification of fish larvae is difficult and that is why limited research is available on biology of fish larvae in the Indo-Pacific coastal region. Estuaries play a vital role in energy transfer between a river and a sea, which is especially important for many commercial coastal fishes whose larvae and juveniles are dependent on the estuary as a nursery and feeding grounds. Many coral reef fish species use mangrove and seagrass beds as nursery habitats. Diet composition of the family Clupeidae were made up of seven major categories to include phytoplankton, plant-like matter, debris, fragment of copepod, algae and unidentified food items. The most predominant food item in the gut of clupeids was phytoplankton (82.53%).
  Aziz Arshad , S.M.N. Amin , Wan Nurul Izzah , D. Aziz and R. Ara
  Planktonic shrimp Acetes japonicus is found in the west of Peninsular Malaysia around the year. The study was conducted to observe the morphometric variation among the population of Acetes japonicus from four different sites along the coastal waters of Malacca, Penang and Perlis. Morphometric data of this species was analyzed using ANOVA and PRIMER software to investigate the degree of similarity among the populations of A. japonicus collected from four different sites (Malacca, Penang and two sides in Perlis) in the west coast of Peninsular Malaysia. The ANOVA showed that the mean difference of total length, standard length, carapace length and abdomen length amongst the four populations were highly significant (p<0.05). No significant difference was observed amongst the telson length of four populations (p>0.05). Dendrogram based on both sexes of morphometric characters showed three clusters amongst the populations. Sg. Berembang and Pantai Bersih populations were clustered in one group, Sg. Baharu population was in another group and both groups were well separated from the Klebang Besar population. The highest morphometric resemblance is observed between Sg. Berembang and Pantai Bersih populations which fall under the same group with a similarity of 99.67%. Analysis of variance showed that shrimp samples from the four sites differed significantly (p<0.05) based on morphometric characters.
  Nur Syuhada Mat Noor , Aziz Arshad , S.M. Nurul Amin and Mohd Salleh Kamarudin
  Background and Objective: Copepods are being used widely as live feed in aquaculture industry particularly for larval rearing of fish and crustacean. Several marine copepods have been cultured successfully before but the numbers of species documented is still limited. Cyclopoid copepod, Oithona simplex is readily available in the Malaysian coastal waters and their high abundance is observed in the coastal waters of Port Dickson, Malaysia. It is targeted as a potential live food for larval rearing of marine fish species. The present study was conducted to determine the effect of environmental parameters viz. salinity, temperature, light intensity and photoperiod on the reproductive cycle of cyclopoid copepod, Oithona simplex under laboratory condition. Materials and Methods: Four different salinity levels (20, 25, 30 and 35 ppt), three different temperatures set up (25, 30 and 35°C), three light intensities expose (5, 20, 35 μmol m2 sec1) and three different photoperiod phases (12 h light (L):12 h dark (D), 1 h (L):23 h (D), 24 h (L):0 h (D) were adopted during this experiment. Results were subjected to one-way ANOVA. Results: The results showed that the optimum salinity was recorded at 30 ppt for the highest production of off springs. Similar highest production was found at 35°C temperature setup. The optimum light intensity expose was under 5 μmol m2 sec1 and this was reflected by the increase in reproductive activity and decreased in development period. Subsequently, 12 h light:12 h dark treatment resulted in the highest reproduction process. Conclusion: It could be recommended that optimal environmental condition which comprised of 30 ppt salinity, 35°C temperature, 5 μmol m2 sec1 light intensity and alternate 12 h light and dark photoperiod is required for culturing of O. simplex in captivity. This is the first attempt to breed and mass production in controlled environment. The information gathered from the experiment could be helpful to produce a mass culture of O. simplex indoor for the purpose of live food supply in the hatchery.
  Zaidi Che Cob , Aziz Arshad , Japar Sidik Bujang and Mazlan Abd. Ghaffar
  The study was conducted at the Merambong Shoal, Johor Straits, Malaysia. Strombus canarium was the most abundant herbivorous mollusc within the study site, highly prized as seafood and contributes to the economics of the locals. Ontogenetic development of sex characters and sexual maturity were determined via logistic curve analysis, using shell-length and/or lip thickness as predictors. The minimum shell-length at which sex characters appeared was at 30 mm in males and 32 mm in females and both sexes can definitely be determined at more than 41 mm shell-length. The SX50 (probability of individuals can be sexed is 0.5) was at 38.33 ± 0.41 mm for male and at 37.15 ± 0.31 mm for female. The SL50 (length at which the probability of individuals are matured is 0.5) was at 54.14 ± 0.86 mm shell-lengths for males and at 58.51 ± 1.02 mm shell-lengths for females. The LIP50 (lip thickness at which the probability of individuals are matured is 0.5) values on the other hand was about 0.69 ± 0.0003 and 0.80 ± 0.014 mm for males and females respectively. The findings indicate that sexual dimorphisms occurred at very early stage in S. canarium life history.
  Mohd Hanafi Idris , Aziz Arshad , Japar Sidik Bujang , Siti Khalijah Daud and Mazlan Abdul Ghaffar
  Studies on taxonomy of pen shells were conducted at Merambong Shoal (N1° 19’ 55.62” E103° 35’ 57.75” ), Tanjung Adang Shoal (N1° 19’ 48.03” E103° 33’ 59.44” ) and Merambong Island (N1° 18’ 54.83” E103° 36’ 33.37” ) off South Western Johor coast, Peninsular Malaysia from August 2005 to June 2006. One hundred and seven individuals of pen shells were collected from the study areas for taxonomy identification. Pen shells were grouped based on the internal and external surface of the valves. Seven species were clearly identified where Atrina and Pinna are dominant. Among these seven species, "Pinna deltodes (Menke, 1843) and Pinna incurva (Gmelin, 1791)" are the new distribution record from the seagrasses bed of Sungai Pulai.
  Masitah Saini , Aziz Arshad , S.M.N. Amin and Mohd Hanafi Idris
  Growth, mortalities (natural and fishing) recruitment percentage and exploitation status of Acetes intermedius were examined of samples collected from the coastal waters of Bintulu, Sarawak between January and December 2009. Monthly length frequency data were analyzed using FiSAT software for estimating population parameters, including asymptotic length (L), growth co-efficient (K) and exploitation rate (E) to assess the status of the stock. The asymptotic length (L) and growth co-efficient (K) was estimated as 43.05 mm and 1.90 yr-1. The maximum life span (tmax) A. intermedius was estimated at 1.58 yr-1. Total mortality (Z) was estimated at 4.68 yr-1. The rate of natural mortality (M) and fishing mortality was calculated as 2.49 yr-1 and 2.195 yr-1, respectively. The recruitment pattern of A. intermedius was continuous throughout the year with two major peaks. The exploitation rate (E) was estimated at 0.47 during the study period. The exploitation rate was slightly below the optimum level of exploitation (E = 0.50) and the condition of the stock is still under-fishing status.
  S.M.N. Amin , Aziz Arshad , Siti Shapor Siraj and Japar Sidik Bujang
  Five species of sergestid shrimps viz., Acetes indicus, Acetes japonicus, Acetes intermedius, Acetes vulgaris and Acetes serrulatus were identified from the different coastal region of Peninsular Malaysia and East Malaysia. Acetes indicus was recorded from the coastal waters of Klebang Besar in the state of Malacca and also in Kuala Gula Perak. The widely distributed shrimp A. japonicus was identified from the coastal waters of Klebang Besar (Malacca), Kuala Gula (Perak), Bagan Ajam (Pulau Pinang), Kuala Sala (Kedah) and Sungai Berembang (Perlis). Acetes intermedius was collected from the coastal waters of Klebang Besar (Malacca), Seberang Takir (Terengganu) and Bintulu (Sarawak). Acetes vulgaris and A. serrulatus were restricted to the coastal waters of Pontian and Kukup in southwestern Johor.
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