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  • 1
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    Effects of cowdung application on the production of mud crab (Scylla serrata Forskal) in brackishwater pond (2021)
    In:  http://aquaticcommons.org/id/eprint/16414 | 12051 | 2015-05-09 19:46:59 | 16414 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-04
    Description: A culture experiment of mud crab for 84 days was conducted in earthen pond at Brackishwater Station, Bangladesh Fisheries Research Institute, Paikgacha, Khulna. The aim of the experiment was to study the effects of cowdung application on crab production and water quality. There were three treatments as without cowdung (T1), 500 kg cowdung/ha/fortnight (T2) and 750 kg cowdung/ha/fortnight (T3) with three replicates for each. The result was evaluated on the basis of growth, production, survival rate etc. The experimental months were mid-April '96 to mid-July '96. To maintain a good water quality, water was exchanged in every spring tide. The range of salinity during the experiment was 8-19 ppt. Trash fish and fresh shrimp head were used as feed on raw basis in every alternate week at a rate of 8% body weight of crab at the same time rice bran and wheat flour were used at a rate of 2% body weight as a source of carbohydrate. The production of T1, T2 and T3, were 720.35 kg, 862.16 kg and 669.19 kg/ha respectively. Though the effects of cowdung on production of crab is insignificant but in terms of production, survival rate and growth, the study suggest that the application of cowdung in addition to feed can be recommended for mud crab culture at a rate of 500 kg/ha/fortnight.
    Keywords: Aquaculture ; fertilizers ; manure ; shellfish culture ; pond culture ; pellet feeds ; water quality ; brackishwater aquaculture ; Scylla serrata
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 49-54
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  • 2
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    Water quality management on the enhancement of shrimp (Penaeus monodon Fab.) production in the traditional and improved-traditional ghers of Bangladesh (2021)
    In:  http://aquaticcommons.org/id/eprint/16444 | 12051 | 2015-03-27 09:21:14 | 16444 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-05
    Description: On-farm research on enhancement of P. monodon production through water quality management was carried out in five ghers of Paikgacha, Khulna. Based on the prevailing condition of the ghers, lime in the form of CaCO(sub 3), urea and TSP were used as the major inputs to minimize the soil-water acidity and to ensure the availability of natural food particles in the water bodies. Exchange of water at required level also practiced for the qualitative improvement of culture water. Ghers of varying sizes showed that water quality management and fertilization have a positive impact on production performance of P. monodon (61.59% increment) that yielded an average production of 385.43 kg/ha/crop against the present traditional rate of 238.50 kg/ha/year.
    Keywords: Aquaculture ; shrimps ; Penaeus monodon ; water quality ; traditional farming ; Bangladesh
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 63-68
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  • 3
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    Factors affecting the adoption of carp polyculture in Bangladesh (2021)
    In:  http://aquaticcommons.org/id/eprint/18014 | 9237 | 2015-09-25 19:25:46 | 18014 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-04
    Description: A study was conducted to determine the factors affecting adoption of pond polyculture in six villages of three districts namely Mymensingh, Bogra and Narshingdi in Bangladesh. In Mymensingh, 75% pond owners adopted carp polyculture technology whereas in Bogra and Narshingdi only 16% and 25% pond owners, respectively adopted this technology for fish production. The production of fish per unit area was found to be 5 to 10 times higher in Mymensingh compared to that of Bogra and Narshingdi. Fish farmers identified three main problems affecting the adoption of pond polyculture viz. lack of input used in aquaculture, low fish yield and lack of credit facilities for pond polyculture. The technological awareness of the farmers directly contributed towards use of inputs in culture ponds. The positive impact of technological dissemination found on input use, fish yield and uplifted socioeconomic condition.
    Keywords: Aquaculture ; Fisheries ; carp polyculture ; impact assessment
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 81-82
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  • 4
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    Studies on the induced breeding and post-larval rearing of shing (Heteropneustes fossilis Bloch) (2021)
    In:  http://aquaticcommons.org/id/eprint/16397 | 12051 | 2015-03-27 10:04:52 | 16397 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-04
    Description: An experiment was conducted on induced breeding and fry rearing of shing, Heteropneustes fossilis (Bloch) in the Department of Aquaculture, Bangladesh Agricultural University for a period of four months from April to July 1994. Hatching rate was calculated at 21.50h and was found to be 45 to 55 % and the survival rate of larvae was 30 to 40 % at 26 to 29°C. Survival rate and growth rate of post larvae were found to be 50 to 60% and 96.6 to 117.2% respectively. Feed-3 (F3) showed the highest survival rate and growth rate of post larvae.
    Keywords: Aquaculture ; larvae rearing ; induced breeding ; fish larvae ; fish culture ; Heteropneustes fossilis
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 139-144
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  • 5
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    Rearing of Clarias batrachus (Lin.) larvae with formulated diets (2021)
    In:  http://aquaticcommons.org/id/eprint/16384 | 12051 | 2015-03-27 10:01:50 | 16384 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-06-25
    Description: An experiment was carried out for a period of 20 days using 7-day old Clarias batrachus larvae of initial total length of 7.4 ± 0.49 mm and weight of 2.9 ± 0.83 mg. Three artificial diets were used for the study having three replication of each. Among these, diet-I was formulated using 20% fish meal (FM), 30% powdered milk and 30% boiled egg yolk (BEY), diet-II using 27% FM, 20% Baker’s yeast (BY), 30% BEY and 3% agar and diet-III using 20% FM, 20% BY and 45% whole egg. The larvae fed on diets-II and III showed significantly (P〈0.05) better length and weight gain than those of the larvae fed on diet-I. The larvae fed on diet- III showed the best survival rate (70%). However, the condition factor of the larvae fed on diet I was significantly better than those of the larvae fed on other two diets. The results of the study showed that C. batrachus larvae could be successfully reared with diet containing 45% whole egg, 20% yeast and 20% fish meal.
    Keywords: Aquaculture ; catfishes ; Clarias batrachus ; larvae ; feed ; diets
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 41-46
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  • 6
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    Culture of pearl in freshwater mussels (Lamellidens marginalis Lamarck) (2021)
    In:  http://aquaticcommons.org/id/eprint/16443 | 12051 | 2015-03-27 09:07:14 | 16443 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-05
    Description: A pond trail on pearl culture in freshwater mussels, Lamellidens marginalis was carried out for one year in an artificial perennial pond. Four types of foreign particles of indigenous sources, sand, stone, fish eyeball and beads of artificial pearl nucleus were used as nucleus for pearl production. Among the nuclei inserted mussel highest survival rate (72%) was recorded for stone and lowest survival rate (50%) for artificial pearl by nucleus implantation. Highest pearl production rate (%) was recorded for the insertion of stone and lowest for the sand. All nuclei inserted mussel produced pearl accept the mussel which was inserted beads of pearl nucleus for pearl formation. Growth rate (length and weight) was found higher for uninserted mussel than nuclei inserted mussels.
    Keywords: Aquaculture ; Lamellidens marginalis ; pearl culture ; pond culture ; growth ; freshwater molluscs
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 57-61
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  • 7
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    Growth and survival of Clarias batrachus (Lin.) larvae fed on formulated diets (2021)
    In:  http://aquaticcommons.org/id/eprint/16399 | 12051 | 2015-03-27 09:56:42 | 16399 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-07-04
    Description: An experiment was conducted for a period of 28 days using 7-day old C. batrachus larvae of initial total length (±S.D.) of 7.4 ± 0.49 mm and weight (±S.D.) of 2.8 ± 0.75 mg. Five test diets viz. diets I, II, III, IV and V were prepared. Diet I was formulated using 30% fish meal (FM), 20% soybean meal (SM) and 20% Baker's yeast (BY), diet III using 15% FM, 20% SM, 15% cotton seed meal and 30% BY and diet IV using 20% FM, 30% BY and 30% powdered milk. The remaining two diets (diets II and V) were prepared using minced clam meat (96%) and BY (90%) respectively as the sole source of protein. Three replications were used for each treatment. The larvae fed on diet II exhibited significantly (P〈0.05) better length gain and specific growth rate (SGR) than thoseof the larvae fed on diet III and there was no significant difference among the length gain and SGR of the larvae fed on diet I,II,IV and V. The larvae fed on diet II also showed significantly better weight gain and survival than those of the larvae fed on other diets. There was no significant difference between the condition factor of the larvae fed on diet II and IV. However, the larvae fed on diet II showed better condition factor than those of the larvae fed on other diets.
    Keywords: Aquaculture ; diets ; rearing ; condition factor ; fish larvae ; artificial feeding ; fish culture ; Clarias batrachus
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 151-158
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  • 8
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    Lessons from the breeding program of rohu (2021)
    WorldFish Center | Penang, Malaysia
    In:  http://aquaticcommons.org/id/eprint/2598 | 115 | 2011-09-29 18:45:17 | 2598 | WorldFish Center
    Details
    Publication Date: 2021-06-25
    Description: For the first time in India, selective breeding work has been initiated at the Central Institute of Freshwater Aquaculture, Bhubaneswar, India in collaboration with the Institute of Aquaculture Research (AKVAFORSK), Norway. Rohu has been chosen as the model species because it enjoys the highest consumer preference among Indian major carps (IMC) although its performance was observed to be slower than other IMC. As this was the first ever selection work on any Indian major carp, many procedures and techniques for successful implementation of the programs were standardized (i.e. production of full-sib groups, establishment of model hatchery for selective breeding of carps, rearing of full-sib groups in partitioned nursery ponds, individual tagging with the Passive Integrated Transponder (PIT) tag, communal rearing, sampling, data analysis, field testing and dissemination of improved rohu). After four generations of selection, an average of 17 per cent higher growth per generation was observed in improved rohu.
    Keywords: Aquaculture ; Biotechnology ; Genetics ; Genetic drift ; Genetic diversity ; Fish culture ; Brood stocks ; Induced breeding ; Breeding success ; Research programmes ; India
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 34-40
    Format: 120
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  • 9
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    Preliminary observation on culture of Penaeus monodon in low-saline waters (2021)
    In:  http://aquaticcommons.org/id/eprint/9478 | 115 | 2012-10-08 09:40:24 | 9478 | WorldFish Center
    Details
    Publication Date: 2021-07-06
    Description: The feasibility of semi-intensive culture of Penaeus monodon in low saline environment was investigated by comparing the growth and production in low (0.16-6.52 ppt) and high (4.60-19.42 ppt) saline areas at two stocking densities (10.5 and 16 individuals/m super(2)). After 135 days of culture, yield of shrimp in low and high stocking densities was 1563.37 kg/ha and 2274 kg/ha, respectively, in low saline ponds, and 1173.00 and 1974.00 kg/ha, respectively in high saline ponds. Food conversion ratio (FCR, 1.31-1.58) and specific growth rate (SGR 21.04-21.19%) were higher in low saline ponds as compared to high saline ponds (FCR, 1.35-1.68; SGR, 19.22-19.88%). Growth of shrimp was satisfactory in low saline ponds even when salinity decreased after 60 days of culture to almost freshwater level (0.16 ppt) indicating the variability of semi-intensive culture of P. monodon in low saline environment.
    Keywords: Aquaculture ; Shrimp culture ; Pond culture ; Growth ; Salinity effects ; Stocking density ; Penaeus monodon
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 30-33
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  • 10
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    Relationship between total length and mouth gap of some commercially important carp fry (2021)
    In:  http://aquaticcommons.org/id/eprint/17725 | 9596 | 2015-09-13 13:19:24 | 17725 | Bangladesh Fisheries Research Institute
    Details
    Publication Date: 2021-06-28
    Description: The estimated regression equation for total length and mouth gape computed were LogTL = Log 0.23 + 0.663 log MG (vertically) (r = 0.960) and Log TL = Log 0.08 + 0.686log MG (horizontally) (r = 0.949). In case of rohu average total length from 11350 mm to23775 mm and mouth gape 805 um to 1225 um (vertically) and 700 um to 1110 um(horizontally) between the first day of mouth opening up to 15 days. The regressionequation for total length and mouth gap were Log TL = Log 0.20 + 0.660 log MG(vertically) (r = 0.935) and Log TL = Log 0.02 + 0698 log MG (horizontally) ( r = 0.907). In case of silver carp average total length from 12800 ,urn to 33555 um and mouthgape 690 um to 1210 um (vertically) and 615 um to 1115 um (horizontally) between thefirst day of mouth opening up to 15 days. The regression equation for total length andmouth gape were Log TL = Log 0.36 + 0.596 log MG (vertically) (r = 0.936) and LogTL = Log 0.26 + 0.607 log MG (horizontally) (r = 0.891). The relationship between totallength and mouth gape (vertically and horizontally) of the studied fry were found to belinear and highly significant.
    Keywords: Aquaculture ; Fisheries ; Total length- mouth gape relationship ; Carp fry
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 101-104
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