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  • 1
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    Investigation on bacterial flora of farmed freshwater prawn (Macrobrachium rosenbergii de Man) in Bangladesh (2021)
    In:  http://aquaticcommons.org/id/eprint/16401 | 12051 | 2015-03-27 09:58:22 | 16401 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-04
    Description: Total bacterial load in the haemolymph of freshwater prawn Macrobrachium rosenbergii varied from 6.2x10⁴ to 1.9x10⁷ CFU/ml whereas in the hepatopancreas, bacterial load varied from 1.9x10³ to 2.9x10⁵ CFU/g. The total bacterial load in the pond water varied from 2.6x10² to 4.1x10⁵ CFU/ml. The isolated bacterial genera in the haemolymph and the hepatopancreas of prawn were Streptococcus, Acinetobacter, Micrococcus, Aeromonas, Vibrio, Flavobacterium, Staphylococcus and Pseudomonas, whereas the detected bacterial genera in pond water were Micrococcus, Streptococcus, Vibrio, Flavobacterium, Staphylococcus, Pseudomonas and Aeromonas. Among the detected genera, Vibrio and Staphylococcus were found to be dominant genera in the haemolymph of the sampled prawn throughout the study period whereas Staphylococcus and Pseudomonas were dominant in pond water.
    Keywords: Aquaculture ; pathogenic bacteria ; haemolymph ; prawn culture ; hepatopancreas ; bacteriology ; Macrobrachium rosenbergii
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 171-175
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  • 2
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    A study on damage caused to crustacean and finfish larvae during collection of Penaeus monodon (Fab.) postlarvae in the estuaries of Barguna, Bangladesh (2021)
    In:  http://aquaticcommons.org/id/eprint/16357 | 12051 | 2015-03-27 10:23:19 | 16357 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-04
    Description: A year round investigation in the estuaries of Barguna district revealed that for each Penaeus monodon postlarvae (PL), about 37 larvae of other shrimp species, 12 finfishes and 10 macrozooplankters are destroyed during the process of shrimp seed collection. Although abundance of P. monodon PL was not recorded throughout the year, a significant number of other shrimp spp., fin fishes including macrozooplankters are being damaged by the shrimp seed collectors. This indiscriminate destruction of aquatic organisms during P. monodon PL collection is serious threat to aquatic biodiversity.
    Keywords: Biology ; Penaeus monodon PL ; finfish larvae ; colossal loss ; estuaries ; Barguna ; Bangladesh
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 41-46
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  • 3
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    Nursery rearing of Macrobrachium rosenbergii (de Man) using hapa-nets: effects of stocking density (2021)
    In:  http://aquaticcommons.org/id/eprint/16353 | 12051 | 2015-03-27 10:17:17 | 16353 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-04
    Description: An experiment was conducted in two phases for 45 days each to study the effects of six stocking densities (phase-I: 100, 200 and 300 PL/m² and phase-II: 250, 500 and 750 PL/m²) on growth and survival of Macrobrachium rosenbergii postlarvae (PL) in nylon hapa-nets (1.8m x 1.8m x 1.4m) installed in a pond. Stocking densities of 100, 200 and 300 PL 10/m² resulted in similar (P〈0.05) body length (47-48 mm) and survival rate (84-88%), while body weight (0.62g) in PL with 300/m² was significantly lower than that (0.70g) in PL with 100 and 200/m². The growth (body length 47mm and weight 0.64g) and survival (84%) of PL stocked at 250 PL/m² density were significantly higher (P〈0.05) than that of PL at 500 and 750/m². Besides the variation in growth and survival in PL at six tests stocking densities, a sharp increase in body weight of PL was observed beginning at the 4th week of rearing.
    Keywords: Aquaculture ; Macrobrachium rosenbergii ; stocking density ; hapa-nets
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 9-16
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  • 4
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    Optimum dietary carbohydrate to lipid ratio in stinging catfish, Heteropneustes fossilis (Bloch, 1792) (2021)
    In:  http://aquaticcommons.org/id/eprint/18967 | 12051 | 2015-12-01 11:31:54 | 18967 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-12
    Description: A feeding trial of 8 weeks was conducted in a static indoor rearing system to investigate the optimum carbohydrate to lipid ratio (CHO:L ratio) in stinging catfish, Heteropneustes fossilis. Five iso-nitrogenous (35% crude protein) and iso-energetic (17.06 kJ gˉ¹ gross energy (GE)) fish meal based diets with varying carbohydrate to lipid (CHO:L g/g) ratios of 0.60, 0.98, 1.53, 2.29 and 3.44 for diets 1-5, were tested, respectively. The diets containing a fixed protein to energy ratio (P:E ratio) of 20.50-mg protein kJˉ¹ GE were fed to triplicate groups of 40 fish (per 70-L tank). Fish were fed 5% of their body weight per day adjusted fortnightly. Diet 1, containing 10% carbohydrate and 17% lipids with a CHO:L ratio of 0.60 produced the poorest (p〈0.05) growth rates, feed and protein efficiency. Increasing carbohydrate content in the diets to 26% concomitant with a reduction in lipid content to 11% with a CHO:L ration of 2.29 of diet 5 significantly improved (p〈0.05) growth rates, feed and protein efficiency. But did not differ with diet 4, containing CHO:L ratio 2.29. A further increase in dietary carbohydrate up to 31% and a decrease in lipids levels to 9% with a CHO:L ratio ranging from 2.29 to 3.44 (diet 4-5) did not significantly improve the fish performance. Apparent net protein utilisation (ANPU) of fish fed diet 5 was higher (p〈0.05) than for diets 1 and 2 but did not differ from diets 3 and 4. Higher lipid deposition (p〈0.05) in whole body was observed with decreasing dietary CHO:L ratios as increasing lipid levels. Whole body protein of fish fed varying CHO:L diets did not show any discernible changes among the dietary treatments. This study revealed that H. fossilis can perform equally well on diets containing carbohydrate ranging from 26 to 31%, with 9 to 11% lipid or at CHO:L g/g ratio of 2.29-3.44.
    Keywords: Aquaculture ; Heteropneusts fossilis ; carbohydrate to lipid ratio ; protein utilization ; catfish
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 19-28
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  • 5
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    Smoking of shrimp and fish from coastal village of north-west Bangladesh (2021)
    In:  http://aquaticcommons.org/id/eprint/18890 | 12051 | 2015-11-26 12:43:19 | 18890 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-12
    Description: Traditional smoking of mixed shrimp species is a method of preservation in coastal region of Bangladesh. Besides traditional smoked shrimp, attempt had been made to produce smoked shrimp from brown shrimp, Metapenaeus monoceros and fish from mugil, Liza parsia and the quality of smoked product was found good very on the basis of physical properties, proximate composition and mineral contents of the products.
    Keywords: Fisheries ; smoked shrimps ; smoking ; Metapenaeus monoceros ; Liza parsia ; Bangladesh
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 203-206
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  • 6
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    A mixed culture trail of mud crab (Scylla serrata Forskal) with tilapia ( Oreocromis niloticus L.) (2021)
    In:  http://aquaticcommons.org/id/eprint/17679 | 123 | 2015-09-11 14:55:43 | 17679 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-06-27
    Description: A ten-month study on mixed culture of mud crab Scylla serrata with tilapia(Oreochromis niloticus) was performed in brackish water earthen ponds using live tilapiafry as the only feed for crab. The monthly growth rate varied from 9.07-19.llg amongfour treatments. Treatment T 1, cw: 0.68cm (±0.72) and bw: 19.11 gm (±12.97) showedhighest performance which was followed by T 3, cw: 0.62cm (±0.60) and bw: 13.42 gm(±10.51), T4, cw: 0.65cm (±0.64) and bw: 13.20 gm (±9.89) and T2, cw: 0.36cm (± 0.25) andbw: 9.07 gm (±8.05). Highest survivability of crabs was also recorded in T 1 (21.5%) whichwas followed by T 2 (15.65%), T4 (14.95%) and T 3 (14.15%). In terms of survivability,significant differences (p〈0.05) were observed among the treatments whereas these wererecorded as insignificant difference (p〈0.05) in final weight, weight gain and productionof crabs and tilapia. Mixed culture of mud crab with tilapia could make more rewardingthan crab monoculture but the study suggests that only tilapia fry can not fulfill the feedrequirement of crabs in respects of survivability, final body weight and weight gain.Besides, existed salinity level of 4-12 ppt during experimental period might be theanother key factor for low survivability and weight gain.
    Keywords: Aquaculture ; Fisheries ; Mud crab ; Tlapia ; Mixed culture ; Salinity Bone phosphorus
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 19-25
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  • 7
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    Polyculture of freshwater prawn, Macrobrachium rosenbergii, de Man with carps: effects of prawn stocking density (2021)
    In:  http://aquaticcommons.org/id/eprint/17768 | 9596 | 2015-09-13 13:28:29 | 17768 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-06-29
    Description: Effects of three stocking densities, viz., 35, 50 and 65/decimal (1 decimal = 40.48 m2) ofjuvenile freshwater prawn (Macrobrachium rosenbergii) on prawn and fish production weretested in a polycuture system with silver carp (Hypophthalmichthys molitrix), catla (Catla catla), Grass carp (Ctenophmyngodon idella) and silver barb (Barbodes gonionotus). The fishstocking density was 19/decimal with the species combination of silver carp-10, catlac-6,grass carp-1 and silver barb-2. In a 8-month culture period, the prawn yield 423 ± 144kg/ha was significantly lower (P〈 0.5) with the prawn stocking density of 35/decimalthan that of 548 ± 178 kg/ha and 662 ± 243 kg/ha with 50 and 65/decimal respectively. Thefish production (1844-1891 kg/ha) did not differ significantly (p 〈0.05) among the threetreatments indicating that prawn stocking densities had no influence on fish yield. Thelower mean harvest weight (62 g) and survival rate (67 g) and higher yield (2.67kg/decimal) with the highest stocking rate of prawn reveals that as density was increased,prawn survival and individual weight at harvest decreased but total yield increased.
    Keywords: Aquaculture ; Fisheries ; M. rosenbergii ; Polyculture ; Stocking density
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 135-144
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  • 8
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    Impact of small indigenous species of fish (SIS) on livelihood of local fishing community in two upazilas of Mymensingh (2021)
    In:  http://aquaticcommons.org/id/eprint/18007 | 9237 | 2015-09-29 20:30:43 | 18007 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-04
    Description: The fisher folk used to catch small indigenous species of fish (SIS) from rivers, canals, wetlands and floodplains at little or no cost for their livelihood. Surplus fish was sold at the local market to generate some little capital for the households. The livelihood and consumption of SIS in fishing community of two upazilas viz. Trisal and Ishwarganj under Mymensingh district were studied for 3 months in 2004. Most of the fisher folk of the study areas belong to resource-poor section of the society living below the poverty level. Majority of them had no cultivable land. As professional fishers they face many problems during lean fishing period from January to April due to little or non-availability of fish. Majority of the fisher households consumed SIS three to four days a week. The fisher households of Trisal upazila consumed more small fish than those of Ishwargonj upazila. More than 50% respondents consumed 〈20 g SIS/day and 20% consumed 〉40 g SIS/day in Trisal upazila. On the other hand, in Ishwargonj upzila, most of the fisher households (66%) were found to consume 〈20 g SIS/day. SIS was mostly available from July-December in rivers, wetlands (beels), and canals, and income from fishing was reported to be good. The dominant SIS was Puntius spp., Mystus spp., Anabas testudineus, catfishes, mola, and small prawns. Non-indigenous species like tilapia was also dominant in Trisal upzila where aquaculture practices were well established.
    Keywords: Aquaculture ; Fisheries ; fisher folk ; SIS ; fish consumption ; livelihood
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 101-102
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  • 9
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    Dietary protein and energy interations: an approach to optimizing dietary protein to energy ratio in walking catfish, Clarias batrachus (2021)
    In:  http://aquaticcommons.org/id/eprint/18966 | 12051 | 2015-12-01 11:32:30 | 18966 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-12
    Description: An 8 weeks feeding trial was conducted in a static indoor rearing system to investigate protein to energy ratio (PIE ratio) in walking catfish Clarias batrachus. Six fishmeal based diets of two protein levels (25 and 35%), each with three lipid levels (5, 10 and 15%) resulted in P/E ratios ranging from 13.57 to 21.97 mg protein kJˉ¹ gross energy (GE) were fed to 50 fish in triplicate. Fish were fed 6% of their body weight three times per day adjusted fortnightly. Significantly higher (p〈0.05) growth rates in terms of weight gain, % weight gain and specific growth rate (SGR) were evident in fish fed with higher protein diet. The highest growth rate was found by fish fed 35% protein, 17.06 kJˉ¹GE with a P/E ratio of 20.55 mg protein kJˉ¹GE. Significantly better (p〈0.05) feed conversion ratio (FCR) was also evident in fish fed with higher protein diet and best FCR was found by fish fed 35% protein, 10% lipid, 17.06 kJˉ¹GE with a P/E ratio of 20.55 mg protein kJˉ¹GE. Significantly indifferent (p〉0.05) values of protein utilisation were found in between the both (higher and lower) protein diets. Higher lipid deposition (p〈0.05) in whole body was observed with increasing dietary lipid level at each protein diet and as higher (p〈0.05) for the lower protein diets. The study reveals that C. batrachus performed best the diet containing 35%, 17.06 kJ gˉ¹ and 20.55 mg protein kJ gˉ¹ GE protein, gross energy and P/E ratio respectively.
    Keywords: Aquaculture ; Clarias batrachus ; protein to energy ratio ; dietary protein ; lipid levels
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 9-17
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