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The present study was conducted to estimate the primary productivity of major nursery grounds of hilsa both spatially and seasonally. Gross primary productivity (GPP), net primary productivity (NPP), and community respiration (CR) were... more
The present study was conducted to estimate the primary productivity of major nursery grounds of hilsa both spatially and seasonally. Gross primary productivity (GPP), net primary productivity (NPP), and community respiration (CR) were estimated in summer, rainy, and winter, respectively. The maximum GPP (0.68 gCm-3h-1) and NPP (0.27 gCm-3h-1) were noted during summer season and minimum (0.31 gCm-3 h-1 and 0.19 gCm-3 h-1) in rainy season at all the six stations. The annual average GPP varied from 0.36±0.008 gCm-3h-1to 0.70±0.1 gCm-3h-1. The NPP value varied from 0.23±0.001 gCm-3h-1to 0.51±0.09 gCm-3h-1and exhibited an increasing trend from the month of March to June. CR ranged from 0.12±0.003 gCm-3h-1 to 0.20±0.05 gCm-3h-1 and exhibited an increasing trend from the month of January to May whereas the study found that the CR has also seasonal pattern with maximum and minimum value during summer and winter respectively at all the stations.The data of primary productivity at all statio...
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This experiment was inquired to apprehend the associated relationship among the cell weight, chlorophyll a and total biomass production of Spirulina platensis grown in different concentration of digested rotten guava medium (DRGM) and... more
This experiment was inquired to apprehend the associated relationship among the cell weight, chlorophyll a and total biomass production of Spirulina platensis grown in different concentration of digested rotten guava medium (DRGM) and kosaric medium (KM). This study was carried out to disclose the culture potentiality of different substrates and their impact on production through the assessment of their consequential correlation. The completely randomized design (CRD) was taken into consideration to accomplish the experiment in laboratory condition. The maximum cell weight was assumed in KM (12.41 ± 0.23) followed by 0.816 ± 0.0017, 0.813 ± 0.0013 and 0.807± 0.0011 mg/L in supernatant of 60%, 20% and 40% DRGM, respectively on the 10th day of culture. The correlation (P< 0.01) with the chlorophyll a content (r = 0.745) and total biomass (r = 0.741) revealed significant association and strong correlation with the obtained cell weight in these culture media. In kosaric medium, the g...
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The present study describes the associated relationship between the length-weight, sex ratio and related condition factor of Tenualosa ilisha based on the length and weight data collected from the commercial landing station of BFDC, Cox’s... more
The present study describes the associated relationship between the length-weight, sex ratio and related condition factor of Tenualosa ilisha based on the length and weight data collected from the commercial landing station of BFDC, Cox’s Bazar, from January 2019 to December 2019. The work was carried out on 866 specimens (307 male and 559 female) ranging from 8.4 to 53.6 cm in length and weight of fishes ranging from 7 to 1977g, respectively. The reproductive attributes of T. ilisha appeared in the sex proportions (M: F=1:2) which revealed the prevalence of females in comparison with males. The external observation was taken into consideration to determine the gender of Hilsa. The relationship of length-weight was fitted with the pooled data for males and females independently of all month-to-month samples which results the BW=0.0104TL2.9795 (R2=0.9636) and BW=0.0019TL3.4689 (R2=0.8461) respectively. The results expressed a higher correlation in between the length-weight (r>0.91...
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The study was conducted to assess the growth and production of rohu (Labeo rohita) in intensive aquaculture system in relation to feed conversion ratio (FCR). To assess the weight gain, SGR and FCR, the experiment was performed in six... more
The study was conducted to assess the growth and production of rohu (Labeo rohita) in intensive aquaculture system in relation to feed conversion ratio (FCR). To assess the weight gain, SGR and FCR, the experiment was performed in six concrete tanks under a shed located on the southern th rd corner of Faculty of Fisheries, BAU for 100 days from 26 June to 3 September, 2018. Rohu fry was released at the rate of 4 fry per tank equivalent to the stocking density of 160 fishes/decimal for treatment 1 T and at the rate of 8 fry per tank equivalent to the stocking density of 320 fishes/decimal for treatment 1 2 T . Floating feeds were used for feeding the fish in both treatments. There were three (3) replications 2 for each treatment. During experimental period, feed was given at the rate of 12%, 8%, and 4% of the body weight in first 30 days, second 30 days and final 40 days, respectively. The weight gains of fish were 42.89±1.509 g and 23.49±4.039 g for T and T respectively. The mean pe...
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The physicochemical and biological attributes of a river ecosystem usually reveal the status of the subsistent aquatic life and affiliated species richness index of the biodiversity. Towards appraisal of water quality, physicochemical... more
The physicochemical and biological attributes of a river ecosystem usually reveal the status of the subsistent aquatic life and affiliated species richness index of the biodiversity. Towards appraisal of water quality, physicochemical parameters (i.e., temperature, pH, DO, transparency and conductivity), water nutrients (nitrate, phosphate) and concentration of chlorophyll a were determined. Samples were collected from seven different stations of Hilsa fishery areas with their special feature. The study revealed a slight spatial variation in physicochemical parameters of river water. While the parameters were found to be at acceptable levels, some measures are needed to improve the quality of water to ensure successful migration and reproduction of the Hilsa fish. The water quality parameter was found slightly alkaline (7.4±0.3). The transparency was found (38.3±11.11 cm) followed by water temperature (22.47±01.79 ºC), alkalinity (101.8 ±19.87), conductivity (2139±2101 µS/cm), CO2 (...
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This study was conducted to evaluate the culture potentiality and growth performance of Spirulina (Spirulina platensis) in supernatant digested rotten guava (DRG) in replacement of Kosaric Medium (KM). The Spirulina was inoculated to grow... more
This study was conducted to evaluate the culture potentiality and growth performance of Spirulina (Spirulina platensis) in supernatant digested rotten guava (DRG) in replacement of Kosaric Medium (KM). The Spirulina was inoculated to grow in digested rotten guava media (DRGM) (treatments) with the addition of 9.0 g/L NaHCO3 and micronutrients and KM for a period of 14 days. The cell weight of spirulina was attained a maximum of 12.43±0.20 mg/L (dry wt. basis) in KM followed by 0.818 ± 0.003, 0.815 ± 0.0015 and 0.809± 0.0012 mg/L in supernatant of 60 (T1), 20 (T2) and 40% DRGM (T3), respectively on the 10th day of culture. The cell weight of spirulina grown in these media had highly significant (P<0.01) correlation with the chlorophyll a content (r = 0.746) and total biomass (r = 0.742) of Spirulina. The results showed that the growth performance of spirulina in supernatant of 60% DRGM was significantly (P<0.01) higher than that of spirulina grown in supernatant of 20% and 40% ...
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An experiment was conducted to evaluate the proximate composition of Spirulina platensis and growth performance in supernatant of different concentrations (supernatant of 20, 40 and 60 rotten guavas) of digested rotten guava medium... more
An experiment was conducted to evaluate the proximate composition of Spirulina platensis and growth performance in supernatant of different concentrations (supernatant of 20, 40 and 60 rotten guavas) of digested rotten guava medium (DRGM). The growth rates in terms of optical density, dry cell weight and chlorophyll a of spirulina were varied from each other. The cell weight of Spirulina was attained a maximum of 0.818 ± 0.003 mg/L in 60% DRGM followed by 0.815 ± 0.0015 and 0.809± 0.0012 mg/L in supernatant of 20 and 40%, respectively on the 10th day of culture. Similar trend was also observed in the case of optical density of the media contained Spirulina, chlorophyll a content (mg/L), total biomass (mg/L), specific growth rates (on the basis of cell weight and chlorophyll a) and total biomass of Spirulina. Cell weight of Spirulina grown in these media had highly significant (P < 0.01) correlation with the chlorophyll a content (r = 0.746) and total biomass (r = 0.742) of Spiru...
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The conventional assessment of the specific growth rate (SGR) avoiding intermediary data is highly criticized by scholars as to the data of the beginning and the end of the production cycle usually considered for the measurement. To... more
The conventional assessment of the specific growth rate (SGR) avoiding intermediary data is highly criticized by scholars as to the data of the beginning and the end of the production cycle usually considered for the measurement. To evaluate the SGR, the study was conducted in six concrete tanks under an outdoor laboratory shed from 10th May to 29th July 2017. Tilapia (Oreochromis niloticus) fry was released at the rate of 8 fries per tank as per the recommended stocking density of 320 fishes/decimal in an intensive aquaculture system. To evaluate the experiment, sinking and floating feeds as treatment 1 (T1) and treatment 2 (T2) were used for feeding the fish, respectively. There were three replications for each treatment. During the experimental period, the feed was supplied at the rate of 20%, 15%, and 10% of the body weight in the 1st, 2nd, and 3rd months, respectively. The daily ration of fish was divided into two parts and delivered to fish in the morning and in the evening. A...
Research Interests: Animal Science, Aquaculture, Stocking, Fishery, Nile Tilapia, and 4 moreTilapia, Morning, Aeration, and Oreochromis
This study was intended to assess the comparative growth and production performance in relation to different stocking densities to have better understanding on the consecutive growth 3 trends. Tilapia (Oreochromis niloticus) fry was... more
This study was intended to assess the comparative growth and production performance in relation to different stocking densities to have better understanding on the consecutive growth 3 trends. Tilapia (Oreochromis niloticus) fry was released at the rate of 8 fry per tank (1m 3) as per the recommended stocking density of 320 fishes/decimal and 4 fry per tank equivalent to the stocking density of 160 fishes/decimal in intensive (T1 ) and semi-intensive (T2 ) aquaculture system, 1 2 respectively. Floating feed was used to evaluate the growth performance during the experimental period for T1 and T2 , respectively. There were six replications for each treatment. The feed was 1 2 supplied at the rate of 20%, 15%, and 10% of the body weight during the study period of 90 days. The weight gains of fish were 132.23±1.29 and 63.12±4.97g for T1 and T2 respectively. Feed conversion 1 2, ratio (FCR) in T1 and T2 were 2.43±0.18 and 2.13±0.20, respectively. Higher total production was 1 2 obtained ...
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The stocking density is considered one of the most critical factors that affects the growth performance and production as well. The study was aimed to compare the growth parameters of tilapia at different stocking densities. The growth... more
The stocking density is considered one of the most critical factors that affects the growth performance and production as well. The study was aimed to compare the growth parameters of tilapia at different stocking densities. The growth performance usually considered as the data of the beginning and the end of production cycle avoiding intermediary data for the measurement is highly criticized by the scholars due to the abjection of the accuracy. However, the utilization of floating feed by fish can be acquainted addressing the growth performance at different stages of fish growth. To evaluate the growth performance, the study was conducted in twelve concrete tanks under an outdoor laboratory shed from 10th May to 29th July, 2017. Tilapia (Oreochromis niloticus) fry was released at the rate of 8 fry per tank as per the recommended stocking density of 320 fishes/decimal and 4 fry per tank equivalent to the stocking density of 160 fishes/decimal in intensive semi-intensive aquaculture ...
Research Interests: Animal Science, Biology, Aquaculture, Stocking, Fishery, and 5 moreNile Tilapia, Tilapia, Morning, Aeration, and Oreochromis
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The efficiency of feed is considered as one of the most crucial factors that affects the growth performance, feed conversion ratio and yield as well. The study was aimed to compare the growth parameters of tilapia at different stocking... more
The efficiency of feed is considered as one of the most crucial factors that affects the growth performance, feed conversion ratio and yield as well. The study was aimed to compare the growth parameters of tilapia at different stocking densities to detect the efficiency of sinking feed assessing the growth trends at various sampling stages. To evaluate the comparative yield, the study was carried out in twelve concrete tanks under an outdoor laboratory shed. Tilapia (Oreochromis niloticus) fry was released at the rate of 8 fry per tank as per the recommended stocking density of 320 fishes/decimal and 4 fry per tank equivalent to the stocking density of 160 fishes/decimal in intensive and semi-intensive aquaculture system, respectively. To evaluate the growth trends sinking feed was used for feeding the fish during the experimental period for T1 (Intensive) and T2 (Semi-intensive), respectively. The feed was supplied in each with three replications at the rate of 20%, 15%, and 10% of...
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The growth and survival are considered as the crucial factors that should be taken into consideration in any aquaculture system. The experiment was aimed to evaluate the growth performance and subsequent survival rate of the rohu (Labeo... more
The growth and survival are considered as the crucial factors that should be taken into consideration in any aquaculture system. The experiment was aimed to evaluate the growth performance and subsequent survival rate of the rohu (Labeo rohita) and tilapia (Oreochromis niloticus). It is important to evaluate the growth responses in relation to Feed Conversion Ratio (FCR) and assessment of the total production of the culture unit. As per the recommended stocking density of 320 fishes/decimal in intensive aquaculture system 8 fry per tank was released to assess the growth performance, survival and production of both rohu (T1) and tilapia (T2). During experimental period, there were three replications for each treatment and feed was supplied at the rate of 12%, 8%, and 4% of the body weight of rohu and 20%, 15%, and 10% of the body weight of tilapia in 1st, 2nd and 3rd month for T1 and T2, respectively. The initial weight of individual tilapia was 7.52±1.81 gm and 14.75±0.19 gm for T1 ...