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Articles by A.G. Mazlan
Total Records ( 15 ) for A.G. Mazlan
  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.
  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%).
  R. Ara , A. Arshad , S.M.N. Amin and A.G. Mazlan
  Fish larval diversity is very important for management of the fisheries resources. Fish larval density, family richness, Shannon Wiener index and evenness were determined by analyzing samples collected from the seagrass-mangrove ecosystem of Gelang Patah, Johor Strait, Peninsular Malaysia between October 2007 and September 2008. Five stations were selected namely upper estuary (S1), middle estuary (S2), lower estuary (S3), seagrass beds (S4) and outside seagrass beds (S5). In total, 24 fish larval families were identified from the investigated area. Among them, 14 occurred in upper estuary, 17 in middle estuary, 16 in lower estuary, 20 in seagrass beds and 16 in outside seagrass beds. Overall five (Clupeidae, Blenniidae, Terapontidae, Gobiidae and Sillaginidae) were the most dominant in study areas. Shannon-Wiener index varied significantly within monsoon and intermonsoon seasons peaking in the months October-January and May-August. The highest density of larval fishes was recorded at seagrass station (S4) and the spatial variations in larval density were significant (p<0.05) between seagrass and other four sampling sides. None of the diversity indices showed significant among-stations except only family richness was significantly (p<0.05) higher in seagrass beds than upper estuary.
  A. Arshad , R. Ara , S.M.N. Amin and A.G. Mazlan
  Stomach content of fish larvae of family Terapontidae were studied in samples acquired from Merambong Shoal, south western part of Johor, Malaysia from December 2007 to September 2008. Larvae were collected by subsurface towing of a Bongo net. Stomachs were removed from a total of 117 Terapontidae specimens during the study period and the stomach contents were fully examined. Analyses of prey in the stomach showed 24 important food items belonging to six major groups viz., phytoplankton, zooplankton, algae, plant-like matter, debris and unidentified matters. The predominant food items found in the stomach were phytoplankton (74.25%). This was followed by plant matters (8.02%), algae (6.69%), zooplankton (4.95%), debris (3/65%) and unidentified matters (2.45%). Among the food items, phytoplankton was the first rank by simple resultant index (74.25%). Therefore, it could be concluded that the fish larvae of family Terapontidae are mainly herbivorous.
  R. Ara , S.M.N. Amin , A.G. Mazlan and A. Arshad
  Morphometric data of six dominant families of fish larvae were examined to observe the degree of similarity among the six families. The experiment was conducted in the seagrass-mangrove ecosystems of Gelang Patah, Johor Strait, Peninsular Malaysia. Samples of fish larvae were collected by using bongo net through 30 min subsurface tow. The six dominant families (Terapontidae, Gobiidae, Sillaginidae, Nemipteridae, Blenniidae and Leiognathidae) were selected for the morphometric analysis using one-way ANOVA by SPSS and PRIMER 5 software for cluster analysis. All the morphometric characters, total length, standard length, body depth, snout length, head length, eye diameter and pre anal length of the six dominant families of the order Perciformes were found to be significantly different (p<0.05). The study is formed a basis for further extensive research to be carried out on larval fishes in Malaysian waters.
  A.G. Mazlan and D.J. Grove
  This study elucidates the food intake and growth performance of wild whiting in captivity for 78 days using automatic demand feeding system. Whiting adapted well to using demand feeders. They fed approximately every 29-30 h at 19 oC during August-September and every 23 h at 15 oC in October. In the latter period, peak-feeding activities occurred between “dawn” and “noon” despite continuous 24 h lighting. During this period they ate similar daily amounts of dry weight to that predicted by the voluntarily feeding experiments using natural prey (0.78 %body wet weight (bw) day-1). However growth performance was poor (FCR ≈ 4.2), suggesting that digestibility was poor or that holding conditions/stress was diverting energy from the growth processes. Hierarchical dominance among the individual fish might exist among the experimental fish.
  K.D. Simon , A.G. Mazlan , Z.C. Cob , A. Samat and A. Arshad
  In this study the most common bony structure (scales) and method was investigated for age determination of archer fishes. A total of 85 specimens of archer fishes (Toxotes chatareus and Toxotes jaculatrix) from the estuaries of South Johore, Malaysia were examined for age. Scale length is linearly proportion (r = 0.816) to standard length (SL). Relationship between scale length (L) and scale weight (W) can be expressed by the formula W = 0.0155L2.917. Daily growth rings and annulus of scales count up demonstrated that the ages of the samples for both species were mostly 1-2 years and a handful samples of T. jaculatrix were above 2 years.
  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.
  Roushon Ara , A. Arshad , N. Amrullah , S.M. Nurul Amin , S.K. Daud , A.A. Nor Azwady and A.G. Mazlan
  Diet composition of most common fish larvae of family Sparidae was studied in the Sungai Pulai seagrass bed of Gelang Patah South Western part of Johor, Peninsular Malaysia from December 2007 to May 2008. Larvae were collected by subsurface towing of a bongo net. In situ hydrographic parameters were recorded during the sampling cruises. Stomachs were removed from a total of 80 Sparidae specimens during the study period and the stomach contents were examined. Analysis of prey in the stomach showed 24 important food items belonging to 8 major groups: phytoplankton, zooplankton, algae, insects, plant like matter, decapod appendages, debris and unidentified matters. The predominant food items found in the stomach were phytoplankton (60.85%). This was followed by algae (11.73%), zooplankton (9.35%), plant matters (7.84%), debris (4.60%), insects (2.84%), unidentified matters (1.96%) and decapod appendages (0.82%). Habitat in situ temperatures were recorded at 26.92-30.83°C (Mean± SD, 28.60± 1.38); Dissolved oxygen ranged from 4.73 to 6.24 mg L-1 (5.56± 0.53) and the salinity fluctuation was between 29.37 and 33.68 ppt (31.31± 1.68). Among the food items, phytoplankton was the first rank by Simple resultant index (60.85%) followed by algae (11.73%). Therefore, it could be concluded that the fish larvae of family sparidae are mainly herbivorous.
  Y.G. Seah , A.G. Mazlan , S. Abdullah , C.C. Zaidi , G. Usup and C.A.R. Mohamed
  In this study, stomach content analyses were used to determine the feeding guild of dominant trawl species comprising leiognathids and priacanthids. Specimens were collected from the southeastern coastal waters of Peninsular Malaysia using commercial trawler. Five species of leiognathids and two species of priacanthids were caught throughout the study. The results showed that the mean value of trophic level for leiognathid species, Photopectoralis bindus was 3.22±0.49, Gazza minuta was 2.75±0.29, Secutor indicius was 2.87±0.30, Eubleekeria jonesi was 2.49±0.27, Equulites stercorarius was 2.63±0.30 and for priacanthid species, Priacanthus macracanthus was 3.51±0.47 and Priacanthus tayenus was 3.61±0.45. The results indicated that the feeding regime of P. bindus, G. minuta and S. indicius can be categorized as bentho-pelagic feeders that have forwardly or upwardly protractible mouth types and feed mainly on zooplankton and zoobenthos. E. stercorarius and E. jonesi with a downwardly protractible mouth type feed mainly on zoobenthos and can be classified as benthivorous. The results suggested that the forwardly or upwardly protractible mouth types leiognathids occupy a higher trophic level compared to the downwardly protractible mouth type leiognathids. Both priacanthids with upturned mouth type have similar diet composition consisting of crustaceans, polychaetes, ostracods, fish and cephalopods. They are thus mid-level carnivores since the species are able to consume organisms at trophic level 3.5. The results revealed that the value of trophic level for priacanthid species were higher than leiognathid species.
  R. Ara , A. Arshad , S.M.N. Amin , S.K. Daud and A.G. Mazlan
  Temporal variation of fish larval density and composition between seagrass and outside seagrass beds of the southwestern Johor, Malaysia were investigated between October 2007 and September 2008. Fish larvae were sampled monthly by using a bongo net with 500 μm mesh size and 30 min sub-surface tow. In situ environmental variables were also recorded during the sampling works. The fish larval assemblage comprised of 20 families from the seagrass beds and 16 families recorded from the outside seagrass beds station. In total, 3738 larvae (2,801 from seagrass and 937 from non-seagrass area) were collected. Total larva density was at 79 individuals per 100 m3 and 34 individuals per 100 m3 for seagrass beds and outside seagrass station respectively. Larval abundance varied significantly within monsoon and inter-monsoon seasons, with peaks in February-March and May-July. Top five families were Blenniidae, Clupeidae, Gobiidae, Sillaginidae and Terapontidae and they occurred consistently throughout the year. Larvae belonging to family Clupeidae (47.94% in seagrass and 42.03% in outside seagrass) and Terapontidae (17% in seagrass and 24% in outside seagrass) were the most abundant family in the study areas. The highest density of total larval fishes was recorded at the seagrass ecosystem. The spatial variations in larval density were not significantly (p>0.05) different between the seagrass beds and open sea station.
  C.C. Zaidi , L. Tukimat , A.M. Muzzneena and A.G. Mazlan
  This study has been conducted to investigate the effect of different egg culture densities during incubation on the development and viability of mussel larvae, Mytilus edulis L. The activated eggs were cultured in two different culture densities (less than 5000 eggs l‾1 and more than 15000 eggs l‾1) up to the development of the early shelled veliger or D-larvae stage (ca 72 h). It was found that the percentage yield, quality and viability of mussel larvae (prodissoconch I larvae) were significantly improved if lower culture densities were used (p<0.05). The low culture density environment also produced significantly lower percentage of abnormal larvae, particularly the incidence of abnormal shell development (p<0.05). This finding is of great importance for viable hatchery production of quality mussel spats. However, further experiments are greatly needed to ascertain the feasible incubation density and the optimal larval concentration especially during the early developmental stage of mussel larvae.
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