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Articles by M.A. Ambak
Total Records ( 4 ) for M.A. Ambak
  M.Z. Ihwan , W. Wahidah , M.A. Ambak , M. Ikhwanuddin and H. Marina
  Seventy three sample of wild mud crab genus Scylla were collected from setiu wetland, Terengganu coastal waters, Malaysia with the measured of Carapace Width (CW) and Body Weight (BW) 8.9±0.1 and 103.9±3.8, respectively. The percentage prevalence of parasites from these studies is 81.9% and the mean intensity was 13. The total number of 887 parasites that were collected includes barnacle (Octolasmis spp.), ciliates, sessile protozoan (Epistylis sp.), nematode and copepod. The higher number of parasites that were found is barnacle with prevalence of 71.1% and mean intensity 14.4 followed by ciliates, nematode, copepod and sessile protozoan with prevalence of 18.1, 8.4, 2.4 and 1.2% and mean intensity 1.1, 2.1, 2.0, 1.0, respectively. Results show that pedunculate barnacle genus Octolasmis show the most abundance species of parasites, compared to others.
  R. Mat Piah , S.A. Kamaruddin , N.H. Abdul Kadir and M.A. Ambak
  Background and Objectives: Epinephelus areolatus is one of the most dominant grouper species landed in Terengganu waters. However, the information on the population characteristics of this species is still remaining at large. Otolith is a unique structure in fish that can derive a lot of valuable information on population parameters. This study is the first attempt to describe the relationship between otolith dimension and weight with the fish size. Materials and Methods: The samples of E. areolatus were collected from the main landing ports in Terengganu for 12 months, where 455 otoliths were extracted by up through the gill method. The length and width of otoliths were measured and the weight was recorded. Linear regression was used to analyze the relationship between fish size and otolith weight and dimension. Results: No significant differences observed between the size and weight of the right and left otolith of E. areolatus. A linear regression was plotted for Total Length (TL) and Total Weight (TW) with Otolith Length (OL), Otolith Width (OW) and otolith weight (OWE), showing strong relationship between otolith dimension and weight with fish size. Strong coefficient determination was observed in the relationship between fish size with otolith weight and width than with the otolith length. Conclusion: This study conclude that either left or right otolith would be suitable to use for further study on the age and growth analysis. To identify the diet of piscivores or carnivorous fish based on the relationship between fish length and otolith weight and dimension, the otolith weight and width are more appropriate to be used than otolith length.
  T.D. Dinh , M.A. Ambak , A. Hassan and N.T. Phuong
  This study describe the reproductive biological characteristics and population parameters of the goby, Pseudapocryptes elongatus (Cuvier, 1816), in the coastal mud flat areas of the Mekong Delta, Vietnam. A total of 1058 specimens was collected from January 2004 to June 2005 and results showed that the breeding season occurred with two spawning peaks in July and October. Length at first maturity (Lm) was 15.4 and 16.3 cm for females and males, respectively. The batch fecundity estimates ranged from 2,652 to 29,406 hydrated oocytes per ovary in the fish ranging from 12.8 to 22.4 cm TL. Length frequency data of the goby ranging from 9.0 to 24.0 cm TL were analyzed using the FiSAT II software. The von Bertalanffy growth parameters were determined as L8 = 25.9 cm, K = 0.66 year-1 and to = - 0.26 year-1. The longevity (tmax) of the goby was estimated to be 4.55 years. There were two recruitment peaks with very different magnitudes and the means of these two peaks were separated by an interval of 5 months. Length at first capture (Lc) was 10.05 cm, the instantaneous fishing mortality rate (F = 1.38 year-1) and natural mortality rate (M = 1.46 year-1) accounted for 49 and 51% of the total mortality (Z = 2.84 year-1), respectively. Relative yield-per-recruit and biomass-per-recruit analyses gave Emax = 0.65, E0.1= 0.55 and E0.5 = 0.33. Results show that the fish stock is subjected to growth overexploitation.
  N. Hasyima Ismail , A. Amin Safwan , N. Fairuz Fozi , F.H. Megat , H. Muhd Farouk , S.A. Kamaruddin , M. Ikhwanuddin and M.A. Ambak
  Background: Orange mud crab Scylla olivacea is one of the most important fisheries resources. A new development in ageing technique of crustaceans has been introduced. The detection of growth band deposited in hard structure of gastric mill in the cardiac stomach are found retained after moulting process can be used as age indicator and growth estimation. Objective: This study was carried out to determine the comparison between carapace width and growth band count of S. olivacea in Malaysia. Materials and Methods: Samples were collected from Setiu Wetlands, Terengganu, Malaysia from February until August, 2016. Samples were categorized based on their morphological measurements. The mesocardiac and zygocardiac ossicles in the gastric mill of S. olivacea was dissected out and preserved in solutions and underwent a cross sectioning process. A total of 76 of wild S. olivacea ranging from 6.56 to 12.84 cm in carapace width were analysed. The growth band counts were examined for each individual and ranging from 1 to 3 band counts. Results: A positive linear relation was observed between CW and GBC with r2 = 0.5178, p<0.01. Overall, there was a strong, positive correlation between CW and GBC. Increase in CW were correlated with increases in GBC respectively for this species. Conclusion: Therefore, the carapace width, growth band counts and body weight can be used to improve data on growth, recruitment, maturation and mortality. Thus, this study would able to improve new ageing technique and contribute greatly to improve the conservation and management of S. olivacea in Setiu Wetlands, Terengganu, Malaysia.
 
 
 
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