The early developmental pattern of inland fishes of Bangladesh are not well studied though it has... more The early developmental pattern of inland fishes of Bangladesh are not well studied though it has a great importance in fisheries and aquaculture sector. The embryonic study provides interesting information on further growth and health of the fish and considered as an essential component for optimization of fish seed production by natural and induced breeding. Therefore, the current review work has been undertaken to provide a detail information on embryonic development of important inland fishes of Bangladesh. Information was collected from published scientific papers, unpublished Masters and PhD dissertations from universities, popular articles and other published and grey literature. Diameters of unfertilized egg of the reviewed fish species were found to be 0.5 to 1.3 mm and fertilized egg were 0.49 to 1.6 mm. Shapes of the egg were also variable from species to species. There is little information available on egg activation and egg micropyle of fish species of Bangladesh. The fertilization rate of different fishes ranged from 40.1% to 93.9%. There are different stages of early development in different species and time needs to complete the stages also vary. The timing of post hatching development by metamorphosis was found to vary based on the fish species from several days to weeks. Different factors like temperature, photoperiod, DO, seasonality and presence of chemicals in water were found to affect the early development of fish. The review included eighteen inland fishes and unearthed useful insights of their embryonic development and influence of different factors. As we expect, the outcome of the study would provide a baseline and would be very useful in conducting further research on the embryology of indigenous fishes of Bangladesh.
Different morphotypes of Macrobrachium rosenbergii show variations in growth. The objective of th... more Different morphotypes of Macrobrachium rosenbergii show variations in growth. The objective of the study is to characterize the morphological and genetic variations in M. rosenbergii male and female morphotypes. Juveniles of M. rosenbergii (average body wt. 5.33±0.72 g) were stocked in an earthen pond at a stocking density of 20,000 per hectare and reared for five months using shrimp quality feed. After harvesting, males were characterized into three morphotypes such as blue-and orange-clawed males (BC and OC, respectively) and small males (SM) based on color and claw length. Here, morphometric characteristics of the BC morphotype demonstrated significantly higher (p<0.05) values followed by OC, SM, and females. Likely, the proportion of CL and BL were found to be highest in the OC morphotype (1.25±0.01) followed by BC (1.16±0.10), SM (0.84±0.10), and female morphotypes (0.64±0.16). For the genetic variation study, four allozyme enzymes were screened that were encoded by six loci (Ldh-1*, Mdh-1*, Mdh-1*, Pgm*, Gpi-2*, and Gpi-2*). Two loci, Gpi-1* and Pgm* showed polymorphism (p<0.05) in all morphotypes. The observed (Ho) and expected (He) heterozygosities were higher in the BC morphotype followed by OC, female and SM. In the UPGMA dendrogram, the BC morphotype made a one cluster and was differentiated from other morphotypes by the genetic distance D=0.0047. The results suggest that considerable morphogenetic variations existed in BC, OC and SM morphotypes even though they were siblings.
This experiment was designed with three experimental treatments namely T1 (natural feed), T2 (fee... more This experiment was designed with three experimental treatments namely T1 (natural feed), T2 (feeding with 10% body weight) and T3 (feeding with 5% body weight) for ten weeks. In the content of 33.8% of crude protein (CP), 11.2% of crude fiber (CF), 6% of fat and 10.2% of ash content feed were used as an experimental diet in this experiment. The stocking densities were 280 fish decimal-1 in three treatments where the mean initial weight of fry was 20 ± 0.2 g in all treatments combined and at the end of the experiment the mean final weight was found as 58.9 ± 2.86 g, 134.4 ± 3.62 g and 142.5 ± 4.23 g for T1, T2, and T3 respectively. Mean initial length was 10.2 ± 0.01 cm in three treatments and final length was found as 14.58 ± 1.60 cm, 18.74 ± 1.23 cm and 0.16 ± 2.08 cm in T1, T2 and T3 respectively. The mean weight gains 38.9 ± 1.53 g, 14.4 ± 3.05 g and 122.5 ± 1.5 g, mean length gain 4.38 ± 0.24 cm, 8.54 ± 0.65 cm and 9.96 ± 0.59 cm, mean SGR 1.76%, 3.5% and 3.82% were recorded in T1, T2 and T3, espectively. The highest weight gain, length gain and SGR were found in T3 and the lowest was found in T1. The survival rate was 82%, 88% and 94% in T1, T2 and T3, respectively. FCR values were found as 3.49 ± 0.5 and 2.51 ± 0.4 in T2 and T3. The result demonstrated that feeding with 5% body weight had a better effect on the growth and survival rate of monosex (male) O. niloticus.
The landmark-based morphometric and meristic analysis of three different stocks from the Atrai, t... more The landmark-based morphometric and meristic analysis of three different stocks from the Atrai, the Jamuna and the Kangsha of Bhagna (Labeo ariza, Hamilton 1807) were examined from a phenotypical point of view to evaluate the population structure and to assess shape variation. A total of 90 Bhagna (L. ariza) were collected from three different water bodies: the Atrai, the Jamuna and the Kangsha of Bangladesh during January, 2017. Ten morphometric and nine meristic characters were analyzed along with twenty two truss network measurements. One way ANOVA showed that all morphometric, meristic and truss network measurement were significantly different (P<0.001) among three different stock of the fish. For morphometric and landmark measurements, the first discriminant functions (DF) accounted for 98.6% and 97.9% and the second DF accounted for 1.4% and 2.1%, respectively among group variability, explaining 100% of total among groups variability. For the morphometric and truss network measurements, plotting discriminant functions showed a well separated clusters of the stocks indicating that the measurement were significantly different among three stocks. The dendrogram based on morphometric and landmark distances data showed two major clusters; the Atrai and Jamuna stocks in one cluster and the Kangsha stock in another cluster. High degree of variation was observed in morphological characteristics among three different stocks (the Atrai, Jamuna and Kangsha) of L .ariza due to their environmental variation and separate geographical location. The results of this study are very useful for proper conservation and successful management of L. ariza and also for the scientific community for the further research.
The early developmental pattern of inland fishes of Bangladesh are not well studied though it has... more The early developmental pattern of inland fishes of Bangladesh are not well studied though it has a great importance in fisheries and aquaculture sector. The embryonic study provides interesting information on further growth and health of the fish and considered as an essential component for optimization of fish seed production by natural and induced breeding. Therefore, the current review work has been undertaken to provide a detail information on embryonic development of important inland fishes of Bangladesh. Information was collected from published scientific papers, unpublished Masters and PhD dissertations from universities, popular articles and other published and grey literature. Diameters of unfertilized egg of the reviewed fish species were found to be 0.5 to 1.3 mm and fertilized egg were 0.49 to 1.6 mm. Shapes of the egg were also variable from species to species. There is little information available on egg activation and egg micropyle of fish species of Bangladesh. The fertilization rate of different fishes ranged from 40.1% to 93.9%. There are different stages of early development in different species and time needs to complete the stages also vary. The timing of post hatching development by metamorphosis was found to vary based on the fish species from several days to weeks. Different factors like temperature, photoperiod, DO, seasonality and presence of chemicals in water were found to affect the early development of fish. The review included eighteen inland fishes and unearthed useful insights of their embryonic development and influence of different factors. As we expect, the outcome of the study would provide a baseline and would be very useful in conducting further research on the embryology of indigenous fishes of Bangladesh.
Different morphotypes of Macrobrachium rosenbergii show variations in growth. The objective of th... more Different morphotypes of Macrobrachium rosenbergii show variations in growth. The objective of the study is to characterize the morphological and genetic variations in M. rosenbergii male and female morphotypes. Juveniles of M. rosenbergii (average body wt. 5.33±0.72 g) were stocked in an earthen pond at a stocking density of 20,000 per hectare and reared for five months using shrimp quality feed. After harvesting, males were characterized into three morphotypes such as blue-and orange-clawed males (BC and OC, respectively) and small males (SM) based on color and claw length. Here, morphometric characteristics of the BC morphotype demonstrated significantly higher (p<0.05) values followed by OC, SM, and females. Likely, the proportion of CL and BL were found to be highest in the OC morphotype (1.25±0.01) followed by BC (1.16±0.10), SM (0.84±0.10), and female morphotypes (0.64±0.16). For the genetic variation study, four allozyme enzymes were screened that were encoded by six loci (Ldh-1*, Mdh-1*, Mdh-1*, Pgm*, Gpi-2*, and Gpi-2*). Two loci, Gpi-1* and Pgm* showed polymorphism (p<0.05) in all morphotypes. The observed (Ho) and expected (He) heterozygosities were higher in the BC morphotype followed by OC, female and SM. In the UPGMA dendrogram, the BC morphotype made a one cluster and was differentiated from other morphotypes by the genetic distance D=0.0047. The results suggest that considerable morphogenetic variations existed in BC, OC and SM morphotypes even though they were siblings.
This experiment was designed with three experimental treatments namely T1 (natural feed), T2 (fee... more This experiment was designed with three experimental treatments namely T1 (natural feed), T2 (feeding with 10% body weight) and T3 (feeding with 5% body weight) for ten weeks. In the content of 33.8% of crude protein (CP), 11.2% of crude fiber (CF), 6% of fat and 10.2% of ash content feed were used as an experimental diet in this experiment. The stocking densities were 280 fish decimal-1 in three treatments where the mean initial weight of fry was 20 ± 0.2 g in all treatments combined and at the end of the experiment the mean final weight was found as 58.9 ± 2.86 g, 134.4 ± 3.62 g and 142.5 ± 4.23 g for T1, T2, and T3 respectively. Mean initial length was 10.2 ± 0.01 cm in three treatments and final length was found as 14.58 ± 1.60 cm, 18.74 ± 1.23 cm and 0.16 ± 2.08 cm in T1, T2 and T3 respectively. The mean weight gains 38.9 ± 1.53 g, 14.4 ± 3.05 g and 122.5 ± 1.5 g, mean length gain 4.38 ± 0.24 cm, 8.54 ± 0.65 cm and 9.96 ± 0.59 cm, mean SGR 1.76%, 3.5% and 3.82% were recorded in T1, T2 and T3, espectively. The highest weight gain, length gain and SGR were found in T3 and the lowest was found in T1. The survival rate was 82%, 88% and 94% in T1, T2 and T3, respectively. FCR values were found as 3.49 ± 0.5 and 2.51 ± 0.4 in T2 and T3. The result demonstrated that feeding with 5% body weight had a better effect on the growth and survival rate of monosex (male) O. niloticus.
The landmark-based morphometric and meristic analysis of three different stocks from the Atrai, t... more The landmark-based morphometric and meristic analysis of three different stocks from the Atrai, the Jamuna and the Kangsha of Bhagna (Labeo ariza, Hamilton 1807) were examined from a phenotypical point of view to evaluate the population structure and to assess shape variation. A total of 90 Bhagna (L. ariza) were collected from three different water bodies: the Atrai, the Jamuna and the Kangsha of Bangladesh during January, 2017. Ten morphometric and nine meristic characters were analyzed along with twenty two truss network measurements. One way ANOVA showed that all morphometric, meristic and truss network measurement were significantly different (P<0.001) among three different stock of the fish. For morphometric and landmark measurements, the first discriminant functions (DF) accounted for 98.6% and 97.9% and the second DF accounted for 1.4% and 2.1%, respectively among group variability, explaining 100% of total among groups variability. For the morphometric and truss network measurements, plotting discriminant functions showed a well separated clusters of the stocks indicating that the measurement were significantly different among three stocks. The dendrogram based on morphometric and landmark distances data showed two major clusters; the Atrai and Jamuna stocks in one cluster and the Kangsha stock in another cluster. High degree of variation was observed in morphological characteristics among three different stocks (the Atrai, Jamuna and Kangsha) of L .ariza due to their environmental variation and separate geographical location. The results of this study are very useful for proper conservation and successful management of L. ariza and also for the scientific community for the further research.
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Papers by Md. Borhan Uddin Ahmed
0.16 ± 2.08 cm in T1, T2 and T3 respectively. The mean weight gains 38.9 ± 1.53 g,
14.4 ± 3.05 g and 122.5 ± 1.5 g, mean length gain 4.38 ± 0.24 cm, 8.54 ± 0.65 cm and 9.96 ± 0.59 cm, mean SGR 1.76%, 3.5% and 3.82% were recorded in T1, T2 and T3, espectively. The highest weight gain, length gain and SGR were found in T3 and the lowest was found in T1. The survival rate was 82%, 88% and 94% in T1, T2 and T3, respectively. FCR values were found as 3.49 ± 0.5 and 2.51 ± 0.4 in T2 and T3. The result demonstrated that feeding with 5% body weight had a better effect on the growth and survival rate of monosex (male) O. niloticus.
0.16 ± 2.08 cm in T1, T2 and T3 respectively. The mean weight gains 38.9 ± 1.53 g,
14.4 ± 3.05 g and 122.5 ± 1.5 g, mean length gain 4.38 ± 0.24 cm, 8.54 ± 0.65 cm and 9.96 ± 0.59 cm, mean SGR 1.76%, 3.5% and 3.82% were recorded in T1, T2 and T3, espectively. The highest weight gain, length gain and SGR were found in T3 and the lowest was found in T1. The survival rate was 82%, 88% and 94% in T1, T2 and T3, respectively. FCR values were found as 3.49 ± 0.5 and 2.51 ± 0.4 in T2 and T3. The result demonstrated that feeding with 5% body weight had a better effect on the growth and survival rate of monosex (male) O. niloticus.