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Articles by K.D. Simon
Total Records ( 5 ) for K.D. Simon
  M.S. Mofasshalin , M.A. Bashar , M.M. Alam , Gazi Mahabubul Alam , D. Moumita , A.G. Mazlan and K.D. Simon
  The present study attempts to describe the parasitic infestations of three Indian minor carps (Labeo bata, Labeo gonius and Cirrhinus reba) collected from different fresh water bodies of Rajshahi district, Bangladesh during March 2007 to February 2008. A total of 480 host fishes were examined of which 370 fishes were infected by 4 protozoan (Trichodina sp., lchthyophthirius sp., Apiosoma sp. and Chilodonella sp.), 2 monogenean (Gyrodactylus sp. and Dactylogyrus sp.), 2 crustacean (Argulus sp. and Larnaea sp.), 1 digenean (Fellodistomum sp.) and 1 nematoda (Camallanus sp.) parasitic species. These parasites were isolated from body slime, gills and intestine of the infected fishes. Among the isolated parasites Fellodistomum sp. was found as the highest and Chilodonella sp. was found as the lowest in number. Our results indicate that infection and infestation rate of parasites varied with fish size and season and found to be high in the post-monsoon and winter periods (November-March), when fish are most susceptible to parasites.
  A.G. Mazlan , Y.S. Chung , C.C. Zaidi , A. Samat , A. Arshad , Y.G. Seah , Gazi Mahabubul Alam and K.D. Simon
  The present study describes the meristic, morphometric and Length Weight Relationship (LWR) of tropical silverside, Atherinomorus duodecimalis (Atheriniformes: Atherinidae) an important fishery in the Sea grass and mangrove habitat of Tinggi Island, Johor, Malaysia. A series of sampling survey was conducted in seagrass and mangrove habitats of Tinggi Island, using beach seine net. A total of 94 specimens (3.7-10.3 cm TL) used in this study. The results showed that meristic and morphometric features of the fish studied agreed well with a description of the holotype specimen MNHN A. 4382 and other silverside specimens. The only exception was observed in the upper jaw length and eye diameter as a percentage of head length. The allometric coefficient ‘b’ of the length weight relationship indicated negative allometric growth (b<3.0) in seagrass habitat and positive allometric growth (b>3.0) in mangrove habitat. To the best knowledge of the authors, this study presented the first reference on LWR for this species from Johor waters, Malaysia.
  H.B. Fathi , M.S. Othman , A.G. Mazlan , A. Arshad , S.M.N. Amin and K.D. Simon
  Trace metals (Cu, Zn, Cd and Pb) concentrations in muscles, livers and gills of three important marine fishes, Torpedo Scad (Megalaspis cordyla), Sea Catfish (Arius thalassinus) and Belangeri Croaker (Johnius belangeri) were studied using the Inductively Coupled Plasma Mass Spectrometry (ICP-MS). The samples were collected from Mersing the eastern coastal waters of Peninsular Malaysia. The estimated ranges of Cu, Zn, Cd and Pb concentrations in the muscles, livers and gills of the three fish species were 1.51-3.48, 17.54-28.34, 0.02-0.12 and 0.12-0.15; 15.8-26.0, 80.58-365.1, 2.32-6.14 and 0.57-1.54; 3.04-5.51, 61.63-259.3, 0.03-0.12 and 0.14-2.03 μg g-1 dry weight, respectively. Metal concentrations in the edible parts of the fish were assessed for human consumption according to the Provisional Tolerable Weekly Intake (PTWI) and Provisional Tolerable Daily Intake (PTDI). Generally, levels of metal in muscles were lower than those in livers and gills. Zinc concentration was found to be the highest among the tested metals in all three species. The estimated weekly and daily intakes for the studied metals were far below the PTWI and PTDI limits. Present study reveals that consumption of these fishes from the study area does not pose a risk to human health.
  I. Zamidi , A. Samat , C.C. Zaidi , A.G. Mazlan , Gazi Mahabubul Alam , Abul Quasem Al-Amin and K.D. Simon
  Several aspects of the reproductive biology of four finger threadfin, Eleutheronema tetradactylum collected from coastal waters of Sebatu, Malacca, Peninsular Malaysia between August 2009 and October 2010 were studied to describe the fecundity and temporal reproductive cycle. Temporal reproductive cycle was reviewed utilizing monthly changes in Gonadosomatic Index (GSI) and macroscopic observation of ovaries. Estimated fecundity of mature ovaries ranged from 341,358-1,114,757 eggs with a Total Length (TL) that range from 38.0-55.5 cm. The estimated average fecundity was 663,078±76,935. The relative fecundity ranged from 393-1202 eggs g-1 b.wt. with induced a 657±68 mean value. According to our findings; a linear correlation appeared between the estimated Fecundity (F), Ovary Weight (OW), Body Weight (BW) and Total Length (TL) show. Present results also indicate that four finger threadfin fish has a lengthy spawning season starting from March-September in Malacca coastal waters of Peninsular Malaysia.
  K.D. Simon , A.G. Mazlan and Gires Usup
  Toxicity analysis of the puffer fishes Lagocephalus wheeleri and Lagocephalus sceleratus from the East Coast Water of Peninsular Malaysia was carried out. The presence of tetrodotoxin (TTX) in fish tissue and cultures of bacteria isolated from the liver of the fish were determined. Detection of TTX was carried out by mouse bioassay, Thin Layer Chromatography (TLC) and High Performance Liquid Chromatography (HPLC). The bacteria Shewanella sp. was isolated from the liver of L. wheeleri while, Exiguobacterium sp. and Staphylococcus sp. were isolated from the liver of L. sceleratus. Mouse bioassay showed that tissue extracts of L. wheeleri and culture supernatants of Shewanella sp. were positive for TTX. Tissue extracts of L. sceleratus and culture supernatants of Exiguobacterium sp. and Staphylococcus sp. exhibited non-lethal toxicity to mice but the symptoms were not typical of TTX poisoning. The symptoms in mice, coupled with TLC and HPLC analysis indicated that the toxic factor in L. wheeleri and Shewanella sp. was TTX. This study has confirmed the toxicity of the puffer L. wheeleri and some of this toxicity may be attributed to symbiotic bacteria.
 
 
 
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