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  • 1
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    On the trend of prawn catches in bottom trawls in inshore waters off Kakinada (Andhra Pradesh) (2021)
    In:  http://aquaticcommons.org/id/eprint/16471 | 12051 | 2015-03-28 14:20:48 | 16471 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-05
    Description: From the results of fishing operations during 3 years (from August 1963 to July 1966) attempts were made to study the extent of availability of prawns for bottom trawls. It was found that prawns formed 22.5% of the total catch on an average of the catch rate of 12.3 kg per trawling hour. The prawns were found to be abundant during two periods from November to February and again from April to July. The depth range of 11-15 m yielded better catch rate with best frequency of the optimum catch per hour.
    Keywords: Fisheries ; fishing boats ; fishing gears ; prawns fishery ; trawl nets ; catching efforts ; Kakinada ; Andrea Pradesh ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 33-37
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  • 2
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    On the relative utility of different methods to increase the vertical height in an otter trawl (2021)
    In:  http://aquaticcommons.org/id/eprint/16470 | 12051 | 2015-03-28 14:20:00 | 16470 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-05
    Description: Comparative fishing experiments to study the relative utility of different methods for increased vertical spread of bottom trawl and the availability of off bottom fishes in the region were made using gussets, kite, separate float line and side panels on a two seam net. The catch rates as well as composition of fish were studied. The opening of the trawl mouth, both horizontally and vertically, under different operating gears and towing tension on warps were measured and estimated for comparison purposes. Better catch rate with good quality fishes was obtained with the gear operated with separate float line. With kite, the vertical spread was increased with less catch indicating poor concentration of off bottom fishes.
    Keywords: Fisheries ; fishing gears ; otter boards ; shrimp trawling ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 23-32
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  • 3
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    On the relative catch efficiency of different shaped otter boards in bottom trawling (2021)
    In:  http://aquaticcommons.org/id/eprint/16287 | 12051 | 2015-03-09 15:14:42 | 16287 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-02
    Description: Three different types of otter boards varying in shape were tried to find out their relative catch efficiency. They were operated with two types of nets. The results indicated that the curved otter boards gave more catch per unit effort with all the combinations of nets and riggings tried.
    Keywords: Fisheries ; catch efficiency ; fishing nets ; otter boards ; bottom trawling ; fishing equipment
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 15-20
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  • 4
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    A review of experimental trawling from small and medium sized mechanized vessels off Kanikada (2021)
    In:  http://aquaticcommons.org/id/eprint/18195 | 12051 | 2015-10-14 05:23:37 | 18195 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-06
    Description: The most suitable otter trawl for small boats was found to be a 10.9 to 15m 2-seam trawl with 100cm x 50cm x 35kg horizontally curved otter boards together with long single sweep line. For operation from medium sized trawls, 18.26m 2-seam 18.3m 4-seam and 29.26m long wing trawl were found suitable. An 18.3m 4-seam trawl was netting a considerable quantity of off-bottom fishes. Shrimps predominated in the catches of the 29.26m trawl. Productive grounds for Cynagris species, Psenus species and Decapterus species within 50 to 100m depth ranges off Kakinada were available for profitable exploitation.
    Keywords: Fisheries ; fishing gears ; trawling ; otter boards ; mechanized vessel ; fishing vessels ; Kakinada ; Andra Pradesh ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 97-103
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  • 5
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    On the optimum buoyancy-weight relation for a bottom trawl (2021)
    In:  http://aquaticcommons.org/id/eprint/18230 | 12051 | 2015-10-15 08:06:10 | 18230 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-06
    Description: Comparative fishing operations were carried out with 0.55; 0.75 and 1.00 buoyancy-weight relations of bottom trawl in order to find out the optimum relation. Two nets, 18.26 m. (60') two seam nylon and 16.16 m. (23') two seam cotton trawls, were used for the experiment. The results showed that the total catch per trawling hour with 0.75 B-W relation was 16.5% and 32.08% more than that with 0.55 and 1.00 B-W relation for nylon net used. A similar trend was noticed with cotton trawl also as the catch rate with 0.75 B-W relation was 13.89% and 25.78% more than that with 0.55 and 1.00 B-W relations. However, the analysis of catch composition indicated that the off bottom fishes like lactarius, upenoides sp., synagris sp. etc., were of more percentage with 1.00 B-W relation, near bottom fish like saurida, sciaenids etc., were more with 0.75 B-W relation, while the bottom fishes like soles, prawns, skates and rays etc., were more with 0.55 B-W relation.
    Keywords: Fisheries ; fishing operations ; trawling ; trawl nets ; bottom trawl ; buoyancy-weight relationship ; catch rate ; catch composistion
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 131-137
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  • 6
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    Comparative efficiency of frame nets and trammel nets (2021)
    In:  http://aquaticcommons.org/id/eprint/18302 | 12051 | 2015-10-18 11:29:06 | 18302 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-07
    Description: Fishing experiments were conducted simultaneously with frame nets and trammel nets in the Hirakud Reservoir and the results indicated the relative superiority of frame nets, whose catch rate was two times more than that of the trammel nets.
    Keywords: Fisheries ; experimental fishing ; efficiency ; gear selectivity ; fishing operations ; frame nets ; trammel nets
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 59-61
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  • 7
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    Studies on long wing trawl for shrimps off Kakinada (A.P.) coast - (i) Results of comparative fishing experiments with the conventional two seam trawl (2021)
    In:  http://aquaticcommons.org/id/eprint/18312 | 12051 | 2015-11-14 11:52:28 | 18312 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-07
    Description: Comparative fishing operations with the conventional two seams net and a 29.26 m. long wing shrimp trawl of four seam type were undertaken. The result showed that the four seams net gave nearly twice prawn catch than that of the conventional type. It was also found that the four seams net can be developed into a combination trawl for the effective exploitation of both prawns and fish along the coasts off Kakinada.
    Keywords: Fisheries ; fishing operations ; fishing gears ; trawling ; trawl nets ; prawns fishery ; Kakinada ; Andhra Pradesh ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 101-104
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  • 8
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    On the comparative fishing experiments with a four-seam and a two-seam trawls on the east coast (2021)
    In:  http://aquaticcommons.org/id/eprint/18206 | 12051 | 2015-10-14 05:42:37 | 18206 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-06
    Description: Fishing experiments were undertaken to study the relative utility of a newly designed four seam type net on a conventional two seam net at the centre along the East Coast in both inshore and deeper zones (up to 100m.) and the results indicated that the new four seam net has given higher catch rate of 6 to 8% more with higher catch rate of fish supposed to belong to off bottom region. Further this gear found more selective in obtaining Lactarius, which is one of the good variety of fish from trawlers, in both quantity as well as in quality. In terms of horizontal spread this new net gave less on comparison with the conventional two seam net, thereby showed corresponding increase in vertical spread; but warp tension remained more or less same in both the gear. Both gear have worked equally well in majority of depth ranges experimented with optimum spread. Finally the results indicated that the new net can work well from the present trawlers along the coast.
    Keywords: Fisheries ; fishing gears ; trawling ; otter boards ; seams ; fishing operations ; catch composition ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 169-179
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  • 9
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    Preliminary observations in the design and operation of a three panel, double trawl net (2021)
    In:  http://aquaticcommons.org/id/eprint/18301 | 12051 | 2015-10-18 11:28:33 | 18301 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-07
    Description: Fishing operations were conducted off Kakinada using a 3 panel double trawl net with twin cod-ends to study the utility of the net in catching both bottom and off bottom fishes. The observations indicate that the net is effective in simultaneous catching of bottom as well as off-bottom fishes and separating them while in operation. The design details of the net and the particulars of the fishing operations conducted are presented.
    Keywords: Fisheries ; experimental fishing ; trawl nets ; fishing operations ; Kakinada ; Andhra Pradesh ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 54-58
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  • 10
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    Coloured gill nets for reservoir fishing (2021)
    In:  http://aquaticcommons.org/id/eprint/18332 | 12051 | 2015-10-21 15:56:56 | 18332 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-08
    Description: Experimental fishing with different coloured nets has shown that white net yields better catch. The efficiency of the coloured nets was in the order yellow, grey, green and blue. Though there is little evidence to show some species preference to a particular colour, the results were not conclusive as the analysis of variance indicated that interaction between species and colour is significant only at 5% level.
    Keywords: Fisheries ; experimental fishing ; coloured nets ; fishing gears ; gill nets ; reservoirs
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 44-48
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