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Articles by Mohd Hanafi Idris
Total Records ( 4 ) for Mohd Hanafi Idris
  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.
  Mohd Hanafi Idris , Hadi Hamli , Abu Hena Mustafa Kamal and Amy Halimah Rajaee
  Background and Objective: Meretrix lyrata is hard clam that is found abundantly at Kuching division in Sarawak and used as delicacy by the local people. This study aimed to determine amount of macro and micro-minerals in the soft tissue of M. lyrata. Materials and Methods: Macro and micro-minerals extracted from tissues of Meretrix lyrata, sediment and seawater were determined using air-acetylene flame Atomic Absorption Spectrophotometer (AAS). The minerals; Na, K, Mg, Ca, Zn, Cu, Mn and Fe were extracted from environment, adductor muscle, foot, gill, mantle and siphon from the clam. Concentration of macro and micro minerals were analysed using one way ANOVA and multivariate analysis. Results: The Na (319.552±9.47 μg g–1) and Fe (19.48±4.726 μg g–1) concentration were high in M. lyrata tissues compared to other elements. This result suggested that M. lyrata tend to accumulate more Na and Fe from the environment and this supported by high concentration of Na and Fe in the seawater. Furthermore, multivariate analysis indicated that tested tissues were grouped according to the mineral elements and not based on tissue variety. Therefore, macro and micro-minerals that accumulated in the M. lyrata tissues were non tissue dependent. Conclusion: The affinity of hard clam tissue to accumulate other elements was high and it depends on availability of the elements in the seawater. Hence, pristine environment was important to harvest hard clam as the food source to prevent consumption of unwanted elements such as heavy metals.
  Mohd Hanafi Idris , Azimah Abdul Rahim , Hadi Hamli , M.H. Nesarul and Abu Hena Mustafa Kamal
  Background and Objective: Mangrove clams are considered as food, collected from the nature. These species deserve special attention for its potentiality. This study was aimed to determine the generative activities of the mangrove clam Polymesoda expansa (Mousson, 1849) and relationship with water quality parameters. Materials and Methods: The reproductive biology of mangrove clam Polymesoda expansa (Mousson 1849) was investigated from October, 2010 to November, 2011 in Kelulit, Miri, Malaysia. Different gonad development stages were classified through histological method which was later on correlated with environmental variables through Pearson Correlation analysis. Results: It was observed that P. expansa is a dioecious clam. Five different gonad development stages in both males and females were identified. The Gonad Index (GI) indicated that gametogenesis began in November and by January onwards mature clams were found. Spawning season was identified all the year around mainly during September-December. The highest Gonad Index (GI) value was recorded in September, 2011 for females with 2.0 and it was 1.7 for males in March and November 2011. However, there was no significant difference (p>0.05) in Gonad Index (GI) between the males and females when it was confirmed by Kruskal-Wallis non parametric test. The monthly recorded physico-chemical parameters of estuarine water at sampling site were 2.79±3.15 psu, 5.46±1.34, 29.4±1.3°C, 2.73±1.09 mg L–1 and 283.5±150.5 mm for salinity, pH, temperature, Dissolved Oxygen (DO) and rainfall, respectively. Conclusion: The information gathered from this study indicated that P. expansa is dioecious animal and has continuous gametogenic development through a year. Therefore, P. expansa is able to spawn all the year around regardless on water parameters changes in the habitat.
  Azimah Abdul Rahim , Mohd Hanafi Idris , Abu Hena Mustafa Kamal , S.K. Wong and A. Arshad
  The Condition Index (CI) is a method to measure overall health of fish and that has been applied to estimate the effect that different environmental factors have on clam meat quality. The CI of local mangrove clam Polymesoda expansa in Kelulit, Miri Sarawak was determined from October 2010 to November 2011. Condition index that is generally used to characterize the physiological activity of organisms, varied from 1.8% in December 2010 to 3.4% in October 2011, with low values observed during the spawning period. The clam attained their best condition in quality of flesh weight during July-October. In present study, the CI showed a clear relationship with the reproductive cycle of P. expansa. However, no significant correlation (p>0.05) was found between CI and the different physicochemical parameter of seawater. The data presented is necessary for developing sustainable management strategies and broodstock selection for the species which is crucial in aquaculture development.
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