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Articles by M. Aminur Rahman
Total Records ( 9 ) for M. Aminur Rahman
  M.P.A. Muntaziana , S.M.N. Amin , M. Aminur Rahman , A.A. Rahim and K. Marimuthu
  Snakehead (Channa striatus) belonging to the Channidae family is an indigenous freshwater fish of Malaysia that has carnivorous behavior. C. striatus command high prices since it has a strong demand and are sold alive. It is a commercially important species in Thailand, Philippines, Cambodia and Vietnam. Increased human activities destroyed the feeding and breeding grounds of this species, leading to decline in wild catches. C. striatus is considered as an endangered fish in Bangladesh. The research of C. striatus provides an account of current knowledge, especially on reproduction, culture and nutritional requirement of snakehead. The problems encountered in snakehead culture are discussed and suggestions made to overcome the problems are highlighted.
  M. Hazmadi Zakaria , S.M.N. Amin , M. Aminur Rahman , M. Hatta Mahmud , A. Christianus , S.S. Siraj and A. Arshad
  The present study was carried out to investigate the embryonic and larval development of the endangered Temoleh, Probarbus jullieni in lab-rearing condition. The matured egg and sperm were collected by stripping the bloodstock of Temoleh fish after injecting with ovaprim hormone extract. The samples were collected from hatching tank at every 10 min interval for the first hour, 20 min for the second hour, 30 min for the third hour and then hourly interval up to hatching. After hatching, larvae were observed daily until the complete disappearance of the yolk sacs. The fertilized eggs were spherical, demersal, adhesive and brownish-yellow in colour with a mean diameter of 2316 μm. First cleavage occurred within 10 min post-fertilization at temperature ranged from 26.0 to 28.0°C. Hatching started 22 h post-fertilization and completed within 25 h at the same temperature. The yolk sac was completely absorbed 61 h after hatching. At the same time, the larvae started to swim actively and feed exogenously. This marks the first description on the early life history of P. jullieni. The present study will provide some valuable information on the ontogeny, breeding biology and early larval rearing protocol of P. jullieni which will ultimately be helpful towards the establishment of large scale seed production technique for conservation and aquaculture production.
  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%).
  L.A. Argungu , A. Christianus , S.M.N. Amin , S.K. Daud , S.S. Siraj and M. Aminur Rahman
  The presence of Asian catfish, Clarias batrachus in Malaysia is at a deteriorating state. It is hardly a cultured species since the supply of seed is unavailable. This species is found in lowland streams, swamp and rice fields. Therefore, they are greatly exposed to factors such as intermittent periods of drought, devastation of the natural habitat and agro-chemicals. Presently, fish farmers are more into the culture of Clarias gariepinus. This threatened the mere existence of this indigenous C. batrachus. Hardiness, good growth, efficient food conversion and excellent nutritional profile guarantee C. batrachus as a suitable aquaculture candidate. Some conservation efforts were looked into in order to prevent the extinction of this potentially important catfish.
  M. Aminur Rahman , A. Arshad , S.M.N. Amin and Mariana Nor Shamsudin
  Nursery rearing of a high-valued threatened snakehead fish, Channa striatus was studied in relation to varying stocking densities in earthen ponds. The experiment was conducted for eight weeks in nine earthen nursery ponds having an area of 0.012 ha with an average depth of 0.8 m. Fry produced from natural propagation was first reared in indoor cemented cisterns with hatched Artemia cyst as live food for 10 days and then stocked at 150,000, 200,000 and 250,000 ha-1 in treatment-1 (T1), treatment-2 (T2) and treatment-3 (T3), respectively. At stocking, mean length and weight of fry was 1.17±0.18 cm and 0.15±0.03 g, respectively. Fry in all the experimental ponds were fed with a supplementary feed comprising of fish meal (50%) and mustard oil cake (50%) at the rate of 5-8% of the estimated body weight. In addition, chopped trash fishes were supplied at the rate of 5% of the estimated biomass daily, till harvest. The physicochemical parameters of water and plankton were monitored simultaneously and were within the acceptable range for fish culture. Growth parameters (final weight, final length, weight gain, length gain and specific growth rate) and survival of fingerlings were significantly higher in T1 than those in T2 and T3, respectively. Feed Conversion Ratio (FCR) was significantly lower in T1 followed by T2 and T3 in that order. Significantly higher survival of fingerlings was obtained in T1 than those in T2 and T3. Overall, highest growth and survival were obtained from T1 where stocking density of fry was 150,000 ha-1. Hence, of the treatments evaluated, stocking density of 150,000 fry ha-1 appears to be the most efficient stocking density for rearing of C. striatus fingerlings in earthen nursery ponds. This study represents the first successful attempt to produce fingerlings of the threatened C. striatus in nursery ponds, the findings of which might immensely be helpful towards the protection of snakehead from extinction as well as for its conservation, stock enhancement and rehabilitation.
  B.I. Usman , S.M.N. Amin , A. Arshad and M. Aminur Rahman
  Despite the vast researches on catfish species in Malaysia, Plotosus canius, the grey- eel catfish which is primarily found throughout the coastal seas of Malaysia has been neglected. No single published work on aspects of biology, especially its reproductive biology is available. In this study, fecundity and egg size of P. canius from coastal waters of Kampong Telok, Malaysia were studied. A total of 32 gravid females were used in the study. The mean fecundity of the female having a length of 50.28 cm and a wet body weight of 680 g was estimated to be 865 eggs. Fecundity was found to show positive relationship with total length (r = 0.379), body weight (r = 0.494) and gonad weight(r = 0.336) but the values were not statistically significant (p>0.05). Egg diameter (mm) among the various length groups showed a polymodal distribution but the differences were statistically significant (p>0.05). This study being the first attempt to gather information of P. canius in Malaysia would form a basis for future works of this catfish.
  M. Aminur Rahman , A. Arshad , Fatimah Md. Yusoff and S.M.N. Amin
  Potential for interspecific hybridization between genetically diverged species of tropical sea urchins, Echinometra sp. A (Ea) and Echinometra mathaei (Em) was examined through cross fertilization and hybrid rearing experiments. Mean performance traits of fertilization, larval survival, metamorphosis and recovery of juveniles Em (ova)xEa (sperm) and Ea (ova)xEm (sperm) hybrids were not significantly different from each other but were significantly lower than either of their conspecific control, EaxEa and EmxEm. Despite these, hybrids in both directions were developed normally to sexually mature adults. The growth parameters (final weight, weight gain, gonad weight, gonad index and SGR) of 2-year-old adult hybrids were significantly higher than the superior parent (EaxEa) and inferior parent (EmxEm). The gonad production showed an increment of 45.49% in F1 hybrids over mid-parents, while it showed an increase of 33.74%, 62.60% and 46.76% in F1 hybrid of EmxEa and 31.42, 59.79 and 44.22% in F1 hybrid of EaxEm over the superior, inferior and mid-parents, respectively. Survival was highest in EmxEm followed by EaxEa, EmxEa and EaxEm in that order. Therefore, body growth, gonad production and survival indicate hybrids in either direction were viable in laboratory conditions. The superiority of these growth traits of the hybrid groups over their parental values indicates positive heterosis (hybrid vigor). This study is the first successful demonstration of hybrid vigor between two diverged species of sea urchins. Hence hybrids in both directions appear to have considerable potential for use in aquaculture.
  M. Aminur Rahman , A. Arshad , K. Marimuthu , R. Ara and S.M.N. Amin
  Inter-specific hybrids have been produced to increase growth rate, improve productivity through hybrid vigor, transfer desirable traits, reduce unwanted reproduction through production of sterile fish, combine other valuable traits such as good flesh quality, disease resistance and increase environmental tolerances, better food conversion, take advantages of sexual dimorphism and increase harvesting rate in culture systems. Hybrids play a significant role for increase in aquaculture production of several species of freshwater and marine fishes; for example, hybrid catfish in Thailand, hybrid stripped bass in the USA, hybrid tilapia in Israel and hybrid characids in Venezuela. Despite its’ wide-spread use in aquaculture, there have been an impression that hybrids do not hold much attraction for aquaculturist. With the expansion of aquaculture sector and the increased number of species being bred and farmed, there are hybrids that now account for a substantial proportion of national aquaculture production and other hybrids may be emerging through further development. As the domestication of fish species increases, the possibilities to increase production through appropriate hybridization techniques is ongoing with a view to produce new hybrid fishes, especially in culture systems where sterile fish may be preferred because of the concern that fish may escape into the open freshwater, marine and coastal environment. Chromosome-set manipulation (polyploidization) has been combined with hybridization to increase the viability and to improve developmental stability of hybrid fishes. Intentional or accidental hybridization can lead to unexpected and undesirable results in hybrid progeny, such as reduced viability and growth performances, loss of color pattern and flesh quality and also raises risks to maintenance of genetic integrity of species if the hybrids escape to the natural habitat and undergo backcrosses with the parental species. The success of inter-specific hybridization can be variable and depend on the genetic structure, crossing patterns, gamete compatibility and gene flow patterns of the parental species. Appropriate knowledge on the genetic constitution of the broodstock, proper broodstock management and monitoring of the viability and fertility of the progeny of brood fishes is thus very crucial before initiating hybridization experiments. In addition, some non-generic factors such as weather conditions, culture systems, seasons and stresses associated with selecting, collecting, handling, breeding and rearing of broodstock and progeny may greatly influence hybridization success in a wide variety of freshwater and marine fin fishes.
  Md. Sirajul Islam , M. Aminur Rahman and Shigemitsu Shokita
  The effects of different salinities and temperatures on the larval development of the semiterrestrial sesarmid mangrove crab Neoepisesarma lafondi (Jaquinot and Lucas, 1853) were examined under laboratory conditions. Its development comprised of four zoeal stages and the megalopa. Successful larval development was observed in 15-30 and 10-35% at 25 and 30°C, respectively. In freshwater and 5% salinity at both temperatures the larvae died within 12-18 hours without moulting to subsequent stages. The larvae reached the first crab stage for salinities between 10 and 35% at 30°C only. The highest survival rate for each larval stage was recorded at 20% for both temperatures. Total development to the first crab stage in 15-30% required 17-20 and 15-19 days at 25 and 30°C, respectively. Significant differences were detected only for megalopal duration at the different salinities and temperatures tested. Results of the combined effects of salinity and temperature suggest that the larvae of N. lafondi develop in estuarine water and recruit to the mangrove swamp at the megalopa stage, where they spend the rest of their lives.
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