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  • 1
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    Trawling pull exerted by a trawler: a method of estimation from propeller dimensions and its comparison with sea measurements (2021)
    In:  http://aquaticcommons.org/id/eprint/16221 | 12051 | 2015-02-12 15:26:06 | 16221 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-01
    Description: The proper matching of the pull exerted by a trawler and the size of trawl is important for maximizing the catching efficiency. The available pull is more dependent on the propeller and its working conditions than the installed engine power. The normal practice is to directly connect net size to the installed power in the boat by formulae without reference to the prope1ler dimensions or the available trawling pull and this is not adequate to find out the optimum combination. By the method outlined in this paper, the accurate calculation of trawling pull is possible by taking into account only the propeller diameter, pitch and r. p. m. The predictions by the method are compared for trawlers with powers between 30 and 60 hp and agreement is found to be within + 5%. The power absorbed by the propeller in trawling condition can also be calculated by this method for checking whether the engine is being overloaded.
    Keywords: Fisheries ; trawling ; trawl nets ; catching methods
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 146-157
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  • 2
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    The study of the sea state data collected from Bay of Bengal during 1964-65 (2021)
    In:  http://aquaticcommons.org/id/eprint/16288 | 12051 | 2015-03-09 15:15:30 | 16288 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-02
    Description: The wave data collected on board Ins Kistna from Bay of Bengal during July to August, 1964 and January, February and April, 1965 are presented. The wave parameters are analyzed and given in a form most suitable for model testing of ships. The variation of wave height with Beaufort number is remarkable. Wave periods from 2 to 10 seconds are observed with maximum frequency in the range of 2 to 5 seconds. The heights and period obtained are compared with those obtained by previous workers for the North Atlantic region and Bay of Bengal. The influence of the wave period 2 to 5 seconds on the rolling, pitching and heaving periods of medium size vessels is also discussed.
    Keywords: Oceanography ; sea state ; data collection ; geophysical data ; design wave ; wave period ; wave height ; statistical analysis ; wave statistics ; dynamical oceanography ; Bay of Bengal ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 21-26
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  • 3
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    Scantlings for small wooden fishing vessels (2021)
    In:  http://aquaticcommons.org/id/eprint/16316 | 12051 | 2015-03-28 15:04:33 | 16316 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-03
    Description: Studies are carried out to find a suitable basis of specifying scantlings for wooden fishing vessels for India, especially for the range 30' to 50' length overall. Equations of the type y=a (where 'y' is scantling in inches, N is cubic numeral in ft³ and 'a', 'b' are constants) are fitted to the scantling tables (applicable to vessels 50’ and above) available from USA, Newfoundland, Denmark, France and Scotland and they are found to represent the regulations accurately. These lines are corrected for standard frame and beam spacing and molded/sided dimensions to bring them on a common basis for comparison and minimum scantling lines for the main structural members are derived. These lines are extended to cover the range 30' to 50' which is generally outside the range of the above regulations.
    Keywords: Fisheries ; fishing vessels ; wood ; artisanal fishing ; construction materials ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 98-107
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  • 4
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    Comparative fishing ability and economic efficiency of mechanised trawlers operating along the Kerala coast (2021)
    In:  http://aquaticcommons.org/id/eprint/16296 | 12051 | 2015-03-28 15:11:54 | 16296 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-03
    Description: This study was undertaken with a view to finding out the comparative fishing ability and economic performance of different fishing vessel sizes 9.15m (30'), 9.76m (32') and 10.97m (36') designed by the Central Institute of Fisheries Technology and operating along the Kerala coast. Data were collected from selected vessels of these sizes for four consecutive fishing seasons from 1964-65 to 1967-68. The catch/unit effort and total effort per year for the 10.97m (36') vessels were much better than those for the 9.76m (32') vessels. The yearly landings and the crew remuneration for the former were about twice those of the 9.76m (32') vessels. The economic efficiency of the 10.97m (36') vessels was also much better. The decline in landings per year in both size groups was more due to the reduction in the effort per year than the decline in catch/unit effort.
    Keywords: Fisheries ; mechanised trawlers ; catching methods ; catch efficiency ; economic models ; fishing technology ; coastal waters ; Kerala ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 71-80
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