Dr. Lokman Ali - Academia.edu (original) (raw)

Papers by Dr. Lokman Ali

Journal of The Bangladesh Agricultural University, 2003

Impact of silver barb (Barbades gonionotus) on the growth and survival of prawn (Macrobrachium ro... more Impact of silver barb (Barbades gonionotus) on the growth and survival of prawn (Macrobrachium rosenbergii) were tested in a polyculture system. There were two treatments and three replication of each. Silver carp (Hypopthalmichthys molitrix), catla (Catla catla) and prawn (M. rosenbergii) were stocked at a stocking density of 10, 3 and 50/decimal, respectively in both treatments. Rohu (Labeo rohita) was stocked at a stocking density of 8/decimal in treatments T1 and silver barb was stocked at a rate of 20/decimal in treatment T2. The average growth and survival rate of silver carp and catla were higher with rohu (T1) than with silver barb (T2). However, differences were not statistically significant .The specific growth rate (SGR) of prawn was higher in T1 (1.98%) than in T2 (1.86%). The significantly higher (P<0.05) survival of (70.85%) was found in T1, where rohu stocked with prawn and the lower survival (61.05%) was obtained in T2, where silver barb was stocked. The yield of prawn in T1 (649.25 kg/ha) was significantly higher (P<0.05) than T2 (456.95 kg/ha). This finding reveled that survival rate and yield of prawn was affected by silver barb and it has exerted an antagonistic effect on growth, survival and production of prawn. Total fish production was significantly higher (P<0.05) in T2(2718.9) than in T1 .(2021.14), because the production of silver<barb was much higher (1669.84 kg/ha) than rohu (954.97 kg/ha).

Production performance and economic viability of over-wintered juveniles of freshwater prawn, Mac... more Production performance and economic viability of over-wintered juveniles of freshwater prawn, Macrobrachium rosenbergii, with Indian major carps Labeo rohita, Catla catla, Hypophthalmichthys molitrix, and Ctenopharyngodon idella were examined in a pond polyculture system for a six-month period from January to June in four sites, namely; Fulpur, Tarakanda, Gafforgaon, and Nandail upazilla under the Mymensingh district of Bangladesh. Four upazillas (sub districts) were considered as treatments, having three ponds in each treatment as replications. The stocking density of M. rosenbergii, L. rohita, C. catla, H. molitrix, and C. idella was 40, 4, 4, 10, and 2 per decimal, respectively. Prawn and fish were fed with farm-made supplementary feed @ 3% body weight twice daily. The ponds were fertilized fortnightly with urea and TSP. The water quality parameters were within the optimum ranges, and suitable for prawn-carp polyculture. The ranges of survival rate of prawn and carps were higher in all treatments (78.33-95.56%) with no significant differences. The yield of prawn was considerably higher (638.38 kgha-1) in Fulpur, followed by 629.66, 592.23, and 558.59 kgha-1 in Tarakanda, Gafforgaon, and Nandail, respectively, while that of carps was the significantly higher in Nandail upazilla (1917.49 kgha-1). A simple economic analysis showed that total expenditure was Tk. 176886 ha-1 , gross income was Tk. 366 760 ha-1 with a benefit cost ratio of 2.07. The results of the study revealed the high potentiality and profitability of producing prawn using over-wintered juveniles of prawn with carps under a polyculture system in the northeast region of Bangladesh.

Croatian Journal of Fisheries, 2020

Loss of fish biodiversity, especially in the inland and coastal areas, is a major concern in sust... more Loss of fish biodiversity, especially in the inland and coastal areas, is a major concern in sustainable fish production. Indiscriminate fish catch, climate change and many other anthropogenic activities synergistically affect fish biodiversity. To formulate a sustainable fish biodiversity conservation plan, fish biodiversity in the Andharmanik River, a 40-km-long Hilsa shad sanctuary in the southern part of Bangladesh, was assessed. The study was conducted to understand the status of fish species diversity through sampling in three sampling stations between December 2014 and November 2015. A total of 93 fish species were found belonging to 66 genera, 45 families and 14 orders. Perciformes (27.65%) was found to be the most dominant order, followed by Cypriniformes (20.21%), Siluriformes (21.28%) Clupeiformes (7.45%) Mastacembeliformes (4.26%) and Channiformes (4.26%). Out of the 93 fish species of the river, the percentage compositions of the vulnerable, endangered, critically endan...

Singapore Journal of Tropical Geography, 2018

Finding potential sites for resilient prawn production in the tropical environment that also prev... more Finding potential sites for resilient prawn production in the tropical environment that also prevents wastage of natural resources is not an easy task. The purpose of this study is to evaluate water quality suitability for prawn farming in Negeri Sembilan of Peninsular Malaysia based on Geographic Information System (GIS). To achieve this goal, numerous criteria including sources of water, water temperature, water pH, sources of pollution, salinity, soil texture and availability of phytoplankton criteria were considered for the modelling process. Analytic Hierarchy Process (AHP) technique was performed to standardize the criteria and the weighting process. The weighted overlay of indicators and results were accomplished by applying the Multi‐Criteria Decision Analysis (MCDA) method in GIS. It was indicated that the Negeri Sembilan area has potential for prawn farming. The results showed that about 25 per cent (163 056.93 ha) of the area was most suitable for prawn farming, about 58 ...

Saudi Journal of Biological Sciences

Effects of high and low cast feed on the hatching and survival rate of freshwater prawn Macrobrac... more Effects of high and low cast feed on the hatching and survival rate of freshwater prawn Macrobrachium rogenbergii larvae were observed. Three different treatments (T1, T2 and T3) were designed with three types of feeds as follows: T1, Saudi-Bangla Prawn feed 100%; T2,Saudi-Bangla prawn feed 50% + low cast feed 50%; T3, low cast feed 100%. The prawns were reared from February to May 2001 until they became mature enough to breed. The results showed that the average value of hatching rate was 90.14%, 89.69% and 89.29% and the average survival rate of larvae was 39.44%, 38.88% and 38.33% in Tl, T2 and T3 respectively. There were no significant differences (P>0.05) between hatching and survival rate of M. rogenbergii from different feeding trails. The price of Saudi-Bangla prawn feed was very high (Tk. 24/kg) than the local feed (Tk. 14/kg). So, use of local feed was recommended for M. rogenbergii brood rearing.

A study was conducted for a period of 45 days to evaluate the efficiency of egg custard in substi... more A study was conducted for a period of 45 days to evaluate the efficiency of egg custard in substituting Atemia nauplii for post larvae production of giant fresh water prawn, Macrobrachium rosenbergii. Three Treatments were designed for feeding with three replications as follows: (i) Treatment Ti, alternate diet (1st 10 days only Artemia then only egg custard), (ii) Treatment T2, combined feed (Artemia and egg custard) and (iii) Treatment T3, egg custard. Stocking density of larvae was 50/liter. Larvae cultured on combined diets had the highest ( P<0.05) mean production rate 26.07±1.13 /I with a corresponding survival of 52.13±2.14%. The post larval yield for the group of larvae fed egg custard alone was nil. This result indicate that rearing of M. rosenbergii larvae using only custard is not possible. During the feeding of combination diet it was observed that larvae were not fed artificial feed before 7 days of rearing Period, artificial feed. The survival rate of larvae fed alt...

Studies were conducted to observe the effects of different types of feeds on the gonado-somatic i... more Studies were conducted to observe the effects of different types of feeds on the gonado-somatic index (GSI) and fecundity of freshwater prawn Macrobrachium rogenbergii. Three different treatments (T1 T2 and T3) were designed with three types of feed as follows: (i) Saudi-Bangla Prawn feed 100% - T1 (ii) SaudiBangla prawn feed 50%+ local feed 50%- T2 and (iii) local feed 100%- T3. The results showed that the average value of gonado-somatic index (GSI) was 14.39, 14.35 and 14.36 and the average fecundity of M. rogenbergiiwas 99,741, 98,125 and 97,911 in T1 T2 and T3 respectively. No significant difference (p>00.5) was between gonado-somatic indices (GSI) and fecundities of M. rogenbergii among different feeding trails. The price of Saudi-Bangla prawn feed was very high (Tk. 23/kg) than the local feed (Tk. 14/kg). So, use of local feed was recommended for M. rogenbergii brood rearing.

International Journal of Fisheries and Aquatic Studies, 2015

First growing strain of climbing perch Vietnamese koi (Anabas testudineus) seed was imported from... more First growing strain of climbing perch Vietnamese koi (Anabas testudineus) seed was imported from Vietnam at 2012. Presently, this strain is getting more popularity than our native and Thai koi strain as the growth rate of Vietnamese koi is much higher. An experiment was conducted from 6 May to 6 September 2013 to optimize the stocking density of Vietnamese climbing perch in the cage at Patuakhali district. Nine cages were used for this experiment having size 2.5m × 1.8m ×1.3m. The experiment was designed into three treatments having three replications assigned into a completely randomized design with various stocking density. The stocking density of different treatments T1, T2 and T3 were 50, 75 and 100 fry.m-3, respectively. Mega floating koi feed was delivered at a rate of 3 to 10% body weight twice a day. There was no significance difference among treatments for different yield parameters of Vietnamese koi (p

International Journal of Fisheries and Aquatic Studies, 2015

Aquaculture and Fisheries, 2021

Abstract This study reflects the biometric characters of the endangered species Nandus nandus (Ha... more Abstract This study reflects the biometric characters of the endangered species Nandus nandus (Hamilton, 1822) including sex ratio, length-length relationships (LLRs), and length-weight relationships (LWRs) utilizing the sum of 14 linear variables, various meristic measurements, reproductive biology, and condition factor from the Borni Baor, a large wetland ecosystem of southwestern Bangladesh. A total of 579 specimens of N. nandus have been periodically collected from the Borni Baor throughout the year (January–December, 2019) using different traditional fishing gears. Highly significant LLRs (r2 > 0.90) values indicate that length parameters are profoundly associated with one another. In the LWR formula (W = aLb), higher exponent b values (b > 3.0) were demonstrating a positive allometric growth with a high correlation coefficient (r2 > 0.94). Moreover, monthly gonadosomatic index and dobriyal index fluctuations suggest the primary breeding season of this fish is from March to July. Data revealed the breeding time was associated strongly with the rainfall and air temperature (p

Aquaculture and Fisheries, 2021

Thalassas: An International Journal of Marine Sciences, 2020

Trace elements contamination in the aquatic ecosystem is a current and major environmental concer... more Trace elements contamination in the aquatic ecosystem is a current and major environmental concern due to their non-degradable nature and toxic effects on human health. Concentrations of arsenic (As), chromium (Cr), cadmium (Cd) and lead (Pb) in fish were estimated to evaluate contamination levels and health risks for Bangladeshi adults. A total of six demersal fish species namely Mystus vittatus , Polynemus paradiseus , Sillaginopsis panijus , Lates calcarifer , Cynoglossus arel and Pseudapocryptes elongates were collected in summer and winter season from the coastal Karnaphuli River, Bangladesh. The analyzed trace elements varied between different species of fish. The concentration of studied trace elements exceed Food and Agriculture Organization/World Health Organization maximum tolerable intake indicating risk to human body. The mean concentration of As, Cr, Cd and Pb were found 2.18, 9.1, 7.2 and 4.38 times higher than the recommended value. Health risks associated with these trace element intakes were evaluated in terms of dietary intake and target hazard quotients (THQs). The THQs value for individual fish species was more than one which was responsible for non-carcinogenic health hazard due to fish consumption. Target Carcinogenic Risk (TR) value for arsenic and lead was also higher than USEPA standard (10 −4 ) indicated chronic cancer risk to human. From the health point of view, this study showed that the inhabitants who consume these fishes are exposed chronically to trace elements pollution with carcinogenic and non-carcinogenic consequences.

Aquaculture Reports, 2020

Grass carp (Ctenopharyngodon idella) was cultured in the inundated low-lying coastal wetlands usi... more Grass carp (Ctenopharyngodon idella) was cultured in the inundated low-lying coastal wetlands using Asian watergrass (Hygroryza aristata) as feed for 6 months. The study was carried out with three treatments, each with three replications. The grass was planted during plot preparation in treatment one (Grass Planted; GP); the grass was collected those grown in an adjacent land and supplied to the fish in treatment two (Grass Supplied; GS); and the fish were fed with commercial feed in treatment three (Commercial Feed; CF). Similar sized juveniles of grass carp (51 ± 6 g) were stocked at the rate of 12,500 fish ha −1 in each treatment. Important water quality parameters were measured at a monthly interval and found within the suitable range for growth of grass carp. The survival was significantly higher in GP (92.7 ± 1.0 %), followed by GS (90.0 ± 1.7 %) and CF (90.0 ± 2.9 %). The growth parameters (weight gain and specific growth rate; SGR) of fish were found significantly higher in GP, followed by CF and GS. The highest total production was found in GP (6770 ± 424 kg ha −1), followed by CF (6733 ± 536 kg ha −1) and GS (5519 ± 483 kg ha −1). The highest net economic benefit and benefit-cost ratio were found in GP (US$ 13375.50 ha −1 and 3.32) and the lowest in CF (US$ 4958.25 ha −1 and 0.42). The results of the present study indicate that Asian watergrass can successfully be used in commercial culture of grass carp and it may significantly reduce the production cost.

Journal of The Bangladesh Agricultural University, 2003

Croatian Journal of Fisheries, 2020

Singapore Journal of Tropical Geography, 2018

Saudi Journal of Biological Sciences

International Journal of Fisheries and Aquatic Studies, 2015

Aquaculture and Fisheries, 2021

Thalassas: An International Journal of Marine Sciences, 2020

Aquaculture Reports, 2020