International Journal of Agricultural Research, Innovation and Technology
The experiment was conducted to determine the effects of population densities of tilapia (Oreochr... more The experiment was conducted to determine the effects of population densities of tilapia (Oreochromis niloticus) on the growth and production of tilapia in monoculture system. Fish population density was 80 fish per decimal under treatment-I, 160 fish per decimal under treatment-II and 320 fish per decimal under treatment-III. In the ponds under three treatments supplementary feed was not used. The average initial length and weight of the fry of tilapia was 4.48 cm and 0.067 g, respectively. The ponds were fertilized fortnightly with urea and TSP at the rates of 60 g, and 90 g per decimal, respectively. Mean survival rates of fish under treatment-I, treatment-II and treatment-III were 91.12%, 82.82% and 66.23%, respectively. The specific growth rates (SGR, % per day) of fish under treatment-I, treatment-II and treatment-III were 5.49%, 4.95% and 4.61%, respectively. The calculated net fish production of the ponds under treatment-I was 2.65 ton ha-1 yr-1 and that of the ponds under t...
Rise of water temperature as a consequence of global warming is anticipated to affect the physiol... more Rise of water temperature as a consequence of global warming is anticipated to affect the physiological activities of fish, especially in tropical regions. In the present experiment, we exposed the Indian major carp, rohu Labeo rohita to three different temperature regimes (30 � C as control and 33 � C and 36 � C) for 60 days and observed the effects of these temperature on: major hemato-biochemical indices (Hemoglobin; Hb, Red blood cell; RBC, White blood cell; WBC and blood glucose levels), erythrocytic nuclear abnormalities (ENA), and erythrocytic cellular abnormalities (ECA) of peripheral erythrocytes along with the formation of differential leucocytes in the blood. Fish were sacrificed at day 7, 15, 30 and 60 after the start of exposure to the temperature regimes. Hb decreased significantly on days 7 and 15 at 36 � C. Throughout the study period, the decrease of RBC and increase of WBC were significant at 36 � C. Blood glucose level increased significantly initially at day 7 but decreased significantly at day 60 at 36 � C. Frequencies of ENA (binucleated, nuclear bud, nuclear bridge, karyopyknosis and notched nuclei) and ECA (twin, fusion, echinocytic, spindle, tear drop and elongated shaped) were significantly increased at the highest temperature (36 � C) at almost all of the sampling days. In the case of differential leucocyte count, high temperature caused a significant increase in the number of neutrophils and a significant decrease in the number of lymphocytes. Overall, these results indicate that chronic exposure to high temperature (36 � C) induces a number of stress responses in rohu and that temperature should be kept below 36 � C in the aquaculture setting to avoid damage to the fish.
Pesticides are one of the notorious causes of environmental pollution because the use of pesticid... more Pesticides are one of the notorious causes of environmental pollution because the use of pesticides is increasing day by day as part of new High Yielding Varieties (Uddin et al., 2016). The Bangladeshi government as has promoted the use of pesticides to increase agricultural yields (Dasgupta et al., 2007). The application of pesticides may lead to contamination of the aquatic environment through several ways including spray drift, runoff, and leaching (Van den Brink, 2013; Shahjahan et al., 2017a). The insecticides used in the agricultural fields are generally classified into four major groups: Organochlorines, Carbamates, Pyrethroids and Organophosphates. The test chemical, cypermethrin belongs to the pyrethroids group and is extremely toxic to fish. Durability of its action in water is about 7-30 days. Pesticides can directly affect fish through alteration in normal behavior (Satyavardhan, 2013; Ullah et al., 2015), physiological functions (changes in hematological parameters), and histoarchitectural changes in liver, kidney, intestine etc.
International Journal of Agricultural Research, Innovation and Technology
An experiment of algal culture was conducted in natural light and temperature conditions at a bal... more An experiment of algal culture was conducted in natural light and temperature conditions at a balcony of a room at the 2 nd floor of Fisheries Faculty Building facing the north. The experiment was done to evaluate the growth of Chlorella ellipsoidea in four different media, viz, medium I (inorganic), medium II (organic, whole pulse powder extract), medium III (organic, whole lentil powder extract) and medium IV (organic, whole gram powder extract) under natural environment conditions during January-June, 2015. Growth rates of the algal species in four different media were found not significantly different. The alga, C. ellipsoidea attained maximum cell density of 28.89×10 6 cell ml-1 in the 15 th day in medium I, of 30.69×10 6 cell ml-1 in the 13 th day in medium II, of 26.18×10 6 cell ml-1 in the 15 th day in medium III and of 21.12×10 6 cell ml-1 in the 13 th day in medium IV. The ranges of air temperature, water temperature and light intensity were 21°C to 38°C, 23°C to 36°C and 2.28×10 3 to 9.60×10 3 Lux respectively during the culture period. The average sunshine period was 5.87±2.82 hrs. Total alkalinity, free CO2, pH , NO3-N and PO4-P of algal culture
Sumithion is extensively used in the agricultural land to control brittle and larval rearing aqua... more Sumithion is extensively used in the agricultural land to control brittle and larval rearing aquaculture ponds to control tiger bug. The present study was conducted to evaluate the effects of sumithion on blood glucose and hemoglobin levels in zebrafish, Danio rerio. At first acute toxicity (96 h LC50 value 7.89 mg/L) of sumithion was determined for sexually matured zebrafish. Then the fish were exposed to four concentrations (0, 0.5, 1.0 and 2.0 mg/L) of sumithion for a period of 7 days. The sexual dimorphic changes in blood glucose levels were observed in the present study. In male, the blood glucose levels were significantly (P<0.05) increased in all concentrations (0.5, 1.0 and 2.0 mg/L) of sumithion compared to control (0 mg/L), while in female the blood glucose levels were significantly (P<0.05) increased only in high concentration (2.0 mg/L). Interestingly, the blood glucose level was higher in females than the males of zebrafish. The recorded hemoglobin values were significantly decreased with the increasing concentration of sumithion in both male and female. The present investigation revealed the toxic potentiality of sumithion on the zebrafish.
The study was conducted to know the present status of conservation and management of sea turtle i... more The study was conducted to know the present status of conservation and management of sea turtle in Coxs Bazar district. Data were collected by physical survey, interviewing people of the study area and from different non-government and government organizations during December 2010 to November 2011. In the present study, it was found that two species of sea turtles have been making nest in Bangladesh. Major nesting sites of turtles were St. Martin's Island, Teknaf, Bordal, Sonadia Island, Kutubdia Island, Pechardwip, Inani Beach, Moheskhali Island and Shahporirdwip. A total of 260 turtle individuals were found and the highest nesting frequency of Olive ridley (108) and Green turtles (10) were observed in February. About 21,942 hatchlings were produced and released by the hatcheries as a conservational step. Winter season was identified as nesting season for sea turtle. About 45% of the respondents thought that turtles were beneficial while other 40% of the respondents thought tu...
A variety of RFamide peptides containing a C terminal-Arg-Phe-NH 2 sequence have been identified ... more A variety of RFamide peptides containing a C terminal-Arg-Phe-NH 2 sequence have been identified throughout the animal kingdom. In the brains of several vertebrates, RFamide peptides have been shown to play important physiological roles in neuroendocrine, behavioural, sensory and autonomic functions (1-3). To date, five groups of the RFamide peptide family have been documented: the LPXRFamide peptide (LPXRFa) group, including gonadotrophininhibitory hormone (GnIH) and RFamide-related peptide (RFRP); the PQRFamide peptide group, including neuropeptide FF (NPFF); the prolactin-releasing peptide (PrRP) group; the kisspeptin ⁄ meta-stin group; and the pyroglutamylated RFamide peptide (QRFP) ⁄ 26RFamide group (3). Among these groups of the RFamide peptide family, LPXRFa peptides possessing a-LPXRFamide (X = L or Q) sequence at their C termini regulate the release of various pituitary hormones (3); however, the precise effects of LPXRFa vary distinctly among animal classes. Quail LPXRFa, designated as GnIH for the first time, decreased the release of luteinising hormone (LH), but not prolactin, from cultured quail anterior pituitaries (4). Intracerebroventricular administration of human RFRP-1 increased plasma prolactin
Int. J. Agril. Res. Innov. & Tech. 3 (2): 41-48, Dec 31, 2013
Rotifers are valuable live food for larval fish and crustacean in aquaculture. In the present stu... more Rotifers are valuable live food for larval fish and crustacean in aquaculture. In the present study, we conducted an experiment to evaluate the suitability of Chlorella ellipsoidea as food for production of the rotifer, Brachionus calyciflorus. The experiment was carried out in three treatments using dried powder Chlorella ellipsoidea (T1), fresh live Chlorella ellipsoidea (T2) and Baker’s yeast (T3) as food with three replications. For supplying food to rotifers, C. ellipsoidea was cultured sufficiently in different inexpensive culture media before rotifer culture and it was continued up to the end of the rotifer culture experiment. The ranges of environmental factors analyzed were suitable for both C. ellipsoidea and rotifers culture during the experimental period. Maximum cell densities of C. ellipsoidea were recorded in inexpensive pulse bran extract medium during the culture period. The mean population densities (means ± SEM) of B. calyciflorus were significantly (p<0.01) hi...
International Journal of Agricultural Research, Innovation and Technology, 2013
Plankton is an important food item of fishes and indicator for the productivity of a water body. ... more Plankton is an important food item of fishes and indicator for the productivity of a water body. The present study was conducted to evaluate the effects of bottom soil textural conditions on abundance of plankton in aquaculture pond. The experiment was carried out using three treatments, i.e., ponds bottom with sandy loam (T1), with loam (T2) and with clay loam (T3). The ranges of water quality parameters analyzed were suitable for the growth of plankton during the experimental period. Similarly, chemical properties of soil were also within suitable ranges and every parameter showed higher ranges in T2. A total 20 genera of phytoplankton were recorded belonged to Chlorophyceae (7), Cyanophyceae (5), Bacillariophyceae (5), Euglenophyceae (2) and Dinophyceae (1). On the other hand, total 13 genera of zooplankton were recorded belonged to Crustacea (7) and Rotifera (6). The highest ranges of phytoplankton and zooplankton densities were found in T2 where low to mediumtype bloom was obse...
International Journal of Agricultural Research, Innovation and Technology, 2013
Plankton is an important food item of fishes and indicator for the productivity of a water body. ... more Plankton is an important food item of fishes and indicator for the productivity of a water body. The present study was conducted to evaluate the effects of bottom soil textural conditions on abundance of plankton in aquaculture pond. The experiment was carried out using three treatments, i.e., ponds bottom with sandy loam (T1), with loam (T2) and with clay loam (T3). The ranges of water quality parameters analyzed were suitable for the growth of plankton during the experimental period. Similarly, chemical properties of soil were also within suitable ranges and every parameter showed higher ranges in T2. A total 20 genera of phytoplankton were recorded belonged to Chlorophyceae (7), Cyanophyceae (5), Bacillariophyceae (5), Euglenophyceae (2) and Dinophyceae (1). On the other hand, total 13 genera of zooplankton were recorded belonged to Crustacea (7) and Rotifera (6). The highest ranges of phytoplankton and zooplankton densities were found in T2 where low to mediumtype bloom was obse...
An experiment was conducted to assess the effects of an organophosphorous pesticide sumithion on ... more An experiment was conducted to assess the effects of an organophosphorous pesticide sumithion on blood glucose and some hematological parameters in common carp, Cyprinus carpio. The experiment was conducted with three treatments, each having three replications. Treatment one (T1) was used as control (0 ppm) and two concentrations, such as 0.85 ppm and 1.70 ppm were used as Treatment two (T2) and Treatment three (T3), respectively. Fish were sacrificed at 7, 14, and 21 days after start of exposure. The sexual dimorphic changes in blood glucose levels were observed in the present study. In male, the blood glucose levels were significantly (P<0.05) increased with the toxicity of sumithion at 7, 14, and 21 days of exposure periods in higher concentrations (T2 & T3) compared to control (T1), while only tended to increases were observed in female. The Hb (g/dL) tended to decrease with toxicity of sumithion though significantly decreased in males at 7 and 14 days of exposure in T3. The RBCs (×106/mm3) were decreased significantly (P<0.05) during the toxicity of sumithion at 7, 14, and 21 days of exposure periods in higher concentrations (T3), whereas Hct (%) showed no significant changes in both concentrations (T2 & T3). On the other hand, WBC were significantly (P<0.05) increased in higher concentrations both in male and female. The present investigation highlighted that sumithion has adverse effects on the metabolism of macromolecules of fish.
Int. J. Agril. Res. Innov. & Tech. 4 (2): 16-21, Dec 31, 2014
A study was conducted to assess the effects of different kinds of inorganic fertilizers on the pr... more A study was conducted to assess the effects of different kinds of inorganic fertilizers on the production of fishes in six ponds during October to December 2011. There were three treatments with two replications under each treatment and each of the ponds was stocked with 80 fish fry. In treatments I, II and III, ponds were fertilized fortnightly @ urea 100 g decimal -1 , T.S.P. 100 g decimal -1 and urea 50 g decimal -1 + T.S.P. 50 g decimal -1 , respectively. Selected water-quality parameters of ponds under study were more or less similar and within the productive range. Mean phytoplankton and zooplankton densities under treatments I, II and III were 57.08 ± 1.35, 8.80 ± 0.09 and 77.29 ± 3.72, 12.88 ± 0.74 and 98.93 ± 1.61, 16.16 ± 1.75 (x10 3 ) cells L -1 , respectively. The net and gross fish productions of the ponds under treatments I, II and III were 0.85 and 3.11 t ha -1 yr -1 and 1.32 and 3.58 t ha -1 yr -1 and 1.85 and 4.11 t ha -1 yr -1 , respectively. Fish production under treatment III was better than those under treatments I and II because plankton population densities under treatment III was the highest. Therefore, the mixed fertilization is suitable for production of plankton that enhance growth and production of fishes.
Int. J. Agril. Res. Innov. & Tech. 4 (2): 11-15, Dec 31, 2014
A study on the effects of artificial feeds on growth and production of fishes along with some lim... more A study on the effects of artificial feeds on growth and production of fishes along with some limnological conditions were conducted in polyculture system. Species of Indian major carp (Cirrhinus mrigala) and exotic fishes (Hypophthalmicthys molitrix and Oreochromis niloticus) were stocked in six ponds under two treatments, each with three replications. Stocking rate in both treatments was 100 fish per decimal at the ratio of silver carp: tilapia: mrigal = 2: 2: 1. Fertilization and artificial feeds were given in Ttreatment 1 (T1) and only fertilization was done in Treatment 2 (T2). Wheat bran, rice bran and soybean meal were given daily as artificial feed in T1 in the ratio of wheat bran: rice bran: soybean meal = 2: 2: 1 (by wt). Urea, T.S.P and cow dung were applied fortnightly at the rate of 60 g deci -1 , 90 g deci -1 and 2 kg deci -1 respectively. Water temperature, transparency, pH, dissolved oxygen, free CO2, total alkalinity, PO4-P and NO3-N were determined fortnightly and phytoplankton and zooplankton were studied fortnightly. These limnological conditions were more or less similar in the ponds under two treatments and were within suitable ranges. Calculated gross and net yields of fish were 16.56 and 12.48 ton ha -1 respectively in case of fertilization and artificial feeding application (T1) and 9.99 and 5.91 ton ha -1 respectively in case of only fertilization (T2). Application of artificial feed in T1 significantly increased the growth and production of fish more than two times which indicates that artificial feeding in polyculture is very useful for increasing fish production.
International Journal of Agricultural Research, Innovation and Technology
The experiment was conducted to determine the effects of population densities of tilapia (Oreochr... more The experiment was conducted to determine the effects of population densities of tilapia (Oreochromis niloticus) on the growth and production of tilapia in monoculture system. Fish population density was 80 fish per decimal under treatment-I, 160 fish per decimal under treatment-II and 320 fish per decimal under treatment-III. In the ponds under three treatments supplementary feed was not used. The average initial length and weight of the fry of tilapia was 4.48 cm and 0.067 g, respectively. The ponds were fertilized fortnightly with urea and TSP at the rates of 60 g, and 90 g per decimal, respectively. Mean survival rates of fish under treatment-I, treatment-II and treatment-III were 91.12%, 82.82% and 66.23%, respectively. The specific growth rates (SGR, % per day) of fish under treatment-I, treatment-II and treatment-III were 5.49%, 4.95% and 4.61%, respectively. The calculated net fish production of the ponds under treatment-I was 2.65 ton ha-1 yr-1 and that of the ponds under t...
Rise of water temperature as a consequence of global warming is anticipated to affect the physiol... more Rise of water temperature as a consequence of global warming is anticipated to affect the physiological activities of fish, especially in tropical regions. In the present experiment, we exposed the Indian major carp, rohu Labeo rohita to three different temperature regimes (30 � C as control and 33 � C and 36 � C) for 60 days and observed the effects of these temperature on: major hemato-biochemical indices (Hemoglobin; Hb, Red blood cell; RBC, White blood cell; WBC and blood glucose levels), erythrocytic nuclear abnormalities (ENA), and erythrocytic cellular abnormalities (ECA) of peripheral erythrocytes along with the formation of differential leucocytes in the blood. Fish were sacrificed at day 7, 15, 30 and 60 after the start of exposure to the temperature regimes. Hb decreased significantly on days 7 and 15 at 36 � C. Throughout the study period, the decrease of RBC and increase of WBC were significant at 36 � C. Blood glucose level increased significantly initially at day 7 but decreased significantly at day 60 at 36 � C. Frequencies of ENA (binucleated, nuclear bud, nuclear bridge, karyopyknosis and notched nuclei) and ECA (twin, fusion, echinocytic, spindle, tear drop and elongated shaped) were significantly increased at the highest temperature (36 � C) at almost all of the sampling days. In the case of differential leucocyte count, high temperature caused a significant increase in the number of neutrophils and a significant decrease in the number of lymphocytes. Overall, these results indicate that chronic exposure to high temperature (36 � C) induces a number of stress responses in rohu and that temperature should be kept below 36 � C in the aquaculture setting to avoid damage to the fish.
Pesticides are one of the notorious causes of environmental pollution because the use of pesticid... more Pesticides are one of the notorious causes of environmental pollution because the use of pesticides is increasing day by day as part of new High Yielding Varieties (Uddin et al., 2016). The Bangladeshi government as has promoted the use of pesticides to increase agricultural yields (Dasgupta et al., 2007). The application of pesticides may lead to contamination of the aquatic environment through several ways including spray drift, runoff, and leaching (Van den Brink, 2013; Shahjahan et al., 2017a). The insecticides used in the agricultural fields are generally classified into four major groups: Organochlorines, Carbamates, Pyrethroids and Organophosphates. The test chemical, cypermethrin belongs to the pyrethroids group and is extremely toxic to fish. Durability of its action in water is about 7-30 days. Pesticides can directly affect fish through alteration in normal behavior (Satyavardhan, 2013; Ullah et al., 2015), physiological functions (changes in hematological parameters), and histoarchitectural changes in liver, kidney, intestine etc.
International Journal of Agricultural Research, Innovation and Technology
An experiment of algal culture was conducted in natural light and temperature conditions at a bal... more An experiment of algal culture was conducted in natural light and temperature conditions at a balcony of a room at the 2 nd floor of Fisheries Faculty Building facing the north. The experiment was done to evaluate the growth of Chlorella ellipsoidea in four different media, viz, medium I (inorganic), medium II (organic, whole pulse powder extract), medium III (organic, whole lentil powder extract) and medium IV (organic, whole gram powder extract) under natural environment conditions during January-June, 2015. Growth rates of the algal species in four different media were found not significantly different. The alga, C. ellipsoidea attained maximum cell density of 28.89×10 6 cell ml-1 in the 15 th day in medium I, of 30.69×10 6 cell ml-1 in the 13 th day in medium II, of 26.18×10 6 cell ml-1 in the 15 th day in medium III and of 21.12×10 6 cell ml-1 in the 13 th day in medium IV. The ranges of air temperature, water temperature and light intensity were 21°C to 38°C, 23°C to 36°C and 2.28×10 3 to 9.60×10 3 Lux respectively during the culture period. The average sunshine period was 5.87±2.82 hrs. Total alkalinity, free CO2, pH , NO3-N and PO4-P of algal culture
Sumithion is extensively used in the agricultural land to control brittle and larval rearing aqua... more Sumithion is extensively used in the agricultural land to control brittle and larval rearing aquaculture ponds to control tiger bug. The present study was conducted to evaluate the effects of sumithion on blood glucose and hemoglobin levels in zebrafish, Danio rerio. At first acute toxicity (96 h LC50 value 7.89 mg/L) of sumithion was determined for sexually matured zebrafish. Then the fish were exposed to four concentrations (0, 0.5, 1.0 and 2.0 mg/L) of sumithion for a period of 7 days. The sexual dimorphic changes in blood glucose levels were observed in the present study. In male, the blood glucose levels were significantly (P<0.05) increased in all concentrations (0.5, 1.0 and 2.0 mg/L) of sumithion compared to control (0 mg/L), while in female the blood glucose levels were significantly (P<0.05) increased only in high concentration (2.0 mg/L). Interestingly, the blood glucose level was higher in females than the males of zebrafish. The recorded hemoglobin values were significantly decreased with the increasing concentration of sumithion in both male and female. The present investigation revealed the toxic potentiality of sumithion on the zebrafish.
The study was conducted to know the present status of conservation and management of sea turtle i... more The study was conducted to know the present status of conservation and management of sea turtle in Coxs Bazar district. Data were collected by physical survey, interviewing people of the study area and from different non-government and government organizations during December 2010 to November 2011. In the present study, it was found that two species of sea turtles have been making nest in Bangladesh. Major nesting sites of turtles were St. Martin's Island, Teknaf, Bordal, Sonadia Island, Kutubdia Island, Pechardwip, Inani Beach, Moheskhali Island and Shahporirdwip. A total of 260 turtle individuals were found and the highest nesting frequency of Olive ridley (108) and Green turtles (10) were observed in February. About 21,942 hatchlings were produced and released by the hatcheries as a conservational step. Winter season was identified as nesting season for sea turtle. About 45% of the respondents thought that turtles were beneficial while other 40% of the respondents thought tu...
A variety of RFamide peptides containing a C terminal-Arg-Phe-NH 2 sequence have been identified ... more A variety of RFamide peptides containing a C terminal-Arg-Phe-NH 2 sequence have been identified throughout the animal kingdom. In the brains of several vertebrates, RFamide peptides have been shown to play important physiological roles in neuroendocrine, behavioural, sensory and autonomic functions (1-3). To date, five groups of the RFamide peptide family have been documented: the LPXRFamide peptide (LPXRFa) group, including gonadotrophininhibitory hormone (GnIH) and RFamide-related peptide (RFRP); the PQRFamide peptide group, including neuropeptide FF (NPFF); the prolactin-releasing peptide (PrRP) group; the kisspeptin ⁄ meta-stin group; and the pyroglutamylated RFamide peptide (QRFP) ⁄ 26RFamide group (3). Among these groups of the RFamide peptide family, LPXRFa peptides possessing a-LPXRFamide (X = L or Q) sequence at their C termini regulate the release of various pituitary hormones (3); however, the precise effects of LPXRFa vary distinctly among animal classes. Quail LPXRFa, designated as GnIH for the first time, decreased the release of luteinising hormone (LH), but not prolactin, from cultured quail anterior pituitaries (4). Intracerebroventricular administration of human RFRP-1 increased plasma prolactin
Int. J. Agril. Res. Innov. & Tech. 3 (2): 41-48, Dec 31, 2013
Rotifers are valuable live food for larval fish and crustacean in aquaculture. In the present stu... more Rotifers are valuable live food for larval fish and crustacean in aquaculture. In the present study, we conducted an experiment to evaluate the suitability of Chlorella ellipsoidea as food for production of the rotifer, Brachionus calyciflorus. The experiment was carried out in three treatments using dried powder Chlorella ellipsoidea (T1), fresh live Chlorella ellipsoidea (T2) and Baker’s yeast (T3) as food with three replications. For supplying food to rotifers, C. ellipsoidea was cultured sufficiently in different inexpensive culture media before rotifer culture and it was continued up to the end of the rotifer culture experiment. The ranges of environmental factors analyzed were suitable for both C. ellipsoidea and rotifers culture during the experimental period. Maximum cell densities of C. ellipsoidea were recorded in inexpensive pulse bran extract medium during the culture period. The mean population densities (means ± SEM) of B. calyciflorus were significantly (p<0.01) hi...
International Journal of Agricultural Research, Innovation and Technology, 2013
Plankton is an important food item of fishes and indicator for the productivity of a water body. ... more Plankton is an important food item of fishes and indicator for the productivity of a water body. The present study was conducted to evaluate the effects of bottom soil textural conditions on abundance of plankton in aquaculture pond. The experiment was carried out using three treatments, i.e., ponds bottom with sandy loam (T1), with loam (T2) and with clay loam (T3). The ranges of water quality parameters analyzed were suitable for the growth of plankton during the experimental period. Similarly, chemical properties of soil were also within suitable ranges and every parameter showed higher ranges in T2. A total 20 genera of phytoplankton were recorded belonged to Chlorophyceae (7), Cyanophyceae (5), Bacillariophyceae (5), Euglenophyceae (2) and Dinophyceae (1). On the other hand, total 13 genera of zooplankton were recorded belonged to Crustacea (7) and Rotifera (6). The highest ranges of phytoplankton and zooplankton densities were found in T2 where low to mediumtype bloom was obse...
International Journal of Agricultural Research, Innovation and Technology, 2013
Plankton is an important food item of fishes and indicator for the productivity of a water body. ... more Plankton is an important food item of fishes and indicator for the productivity of a water body. The present study was conducted to evaluate the effects of bottom soil textural conditions on abundance of plankton in aquaculture pond. The experiment was carried out using three treatments, i.e., ponds bottom with sandy loam (T1), with loam (T2) and with clay loam (T3). The ranges of water quality parameters analyzed were suitable for the growth of plankton during the experimental period. Similarly, chemical properties of soil were also within suitable ranges and every parameter showed higher ranges in T2. A total 20 genera of phytoplankton were recorded belonged to Chlorophyceae (7), Cyanophyceae (5), Bacillariophyceae (5), Euglenophyceae (2) and Dinophyceae (1). On the other hand, total 13 genera of zooplankton were recorded belonged to Crustacea (7) and Rotifera (6). The highest ranges of phytoplankton and zooplankton densities were found in T2 where low to mediumtype bloom was obse...
An experiment was conducted to assess the effects of an organophosphorous pesticide sumithion on ... more An experiment was conducted to assess the effects of an organophosphorous pesticide sumithion on blood glucose and some hematological parameters in common carp, Cyprinus carpio. The experiment was conducted with three treatments, each having three replications. Treatment one (T1) was used as control (0 ppm) and two concentrations, such as 0.85 ppm and 1.70 ppm were used as Treatment two (T2) and Treatment three (T3), respectively. Fish were sacrificed at 7, 14, and 21 days after start of exposure. The sexual dimorphic changes in blood glucose levels were observed in the present study. In male, the blood glucose levels were significantly (P<0.05) increased with the toxicity of sumithion at 7, 14, and 21 days of exposure periods in higher concentrations (T2 & T3) compared to control (T1), while only tended to increases were observed in female. The Hb (g/dL) tended to decrease with toxicity of sumithion though significantly decreased in males at 7 and 14 days of exposure in T3. The RBCs (×106/mm3) were decreased significantly (P<0.05) during the toxicity of sumithion at 7, 14, and 21 days of exposure periods in higher concentrations (T3), whereas Hct (%) showed no significant changes in both concentrations (T2 & T3). On the other hand, WBC were significantly (P<0.05) increased in higher concentrations both in male and female. The present investigation highlighted that sumithion has adverse effects on the metabolism of macromolecules of fish.
Int. J. Agril. Res. Innov. & Tech. 4 (2): 16-21, Dec 31, 2014
A study was conducted to assess the effects of different kinds of inorganic fertilizers on the pr... more A study was conducted to assess the effects of different kinds of inorganic fertilizers on the production of fishes in six ponds during October to December 2011. There were three treatments with two replications under each treatment and each of the ponds was stocked with 80 fish fry. In treatments I, II and III, ponds were fertilized fortnightly @ urea 100 g decimal -1 , T.S.P. 100 g decimal -1 and urea 50 g decimal -1 + T.S.P. 50 g decimal -1 , respectively. Selected water-quality parameters of ponds under study were more or less similar and within the productive range. Mean phytoplankton and zooplankton densities under treatments I, II and III were 57.08 ± 1.35, 8.80 ± 0.09 and 77.29 ± 3.72, 12.88 ± 0.74 and 98.93 ± 1.61, 16.16 ± 1.75 (x10 3 ) cells L -1 , respectively. The net and gross fish productions of the ponds under treatments I, II and III were 0.85 and 3.11 t ha -1 yr -1 and 1.32 and 3.58 t ha -1 yr -1 and 1.85 and 4.11 t ha -1 yr -1 , respectively. Fish production under treatment III was better than those under treatments I and II because plankton population densities under treatment III was the highest. Therefore, the mixed fertilization is suitable for production of plankton that enhance growth and production of fishes.
Int. J. Agril. Res. Innov. & Tech. 4 (2): 11-15, Dec 31, 2014
A study on the effects of artificial feeds on growth and production of fishes along with some lim... more A study on the effects of artificial feeds on growth and production of fishes along with some limnological conditions were conducted in polyculture system. Species of Indian major carp (Cirrhinus mrigala) and exotic fishes (Hypophthalmicthys molitrix and Oreochromis niloticus) were stocked in six ponds under two treatments, each with three replications. Stocking rate in both treatments was 100 fish per decimal at the ratio of silver carp: tilapia: mrigal = 2: 2: 1. Fertilization and artificial feeds were given in Ttreatment 1 (T1) and only fertilization was done in Treatment 2 (T2). Wheat bran, rice bran and soybean meal were given daily as artificial feed in T1 in the ratio of wheat bran: rice bran: soybean meal = 2: 2: 1 (by wt). Urea, T.S.P and cow dung were applied fortnightly at the rate of 60 g deci -1 , 90 g deci -1 and 2 kg deci -1 respectively. Water temperature, transparency, pH, dissolved oxygen, free CO2, total alkalinity, PO4-P and NO3-N were determined fortnightly and phytoplankton and zooplankton were studied fortnightly. These limnological conditions were more or less similar in the ponds under two treatments and were within suitable ranges. Calculated gross and net yields of fish were 16.56 and 12.48 ton ha -1 respectively in case of fertilization and artificial feeding application (T1) and 9.99 and 5.91 ton ha -1 respectively in case of only fertilization (T2). Application of artificial feed in T1 significantly increased the growth and production of fish more than two times which indicates that artificial feeding in polyculture is very useful for increasing fish production.
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