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  • 1
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    Gross energy requirement in fishing operations (2021)
    In:  boopendranath@hotmail.com | http://aquaticcommons.org/id/eprint/10620 | 328 | 2020-08-24 04:30:01 | 10620 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-06-27
    Description: Energy is a key input into the fish harvesting process. Efficient use of energy helps in reducing operational costs and environmental impact, whileincreasing profits. Energy optimisation is an important aspect of responsible fishing as enunciated in the Code of Conduct for Responsible Fisheries.Gross Energy Requirement (GER) is the sum of all non-renewable energy resources consumed in making available a product or service and is expressed in energy units per physical unit of product or service delivered. GER is a measure of intensity of non-renewable resource use and it reflects the amount of depletion of earth’s inherited store of non-renewable energy in order to create and make available a product or service. In this study, GER infish harvesting up to the point of landing is estimated in selected fish harvesting systems in the small-mechanised sectors of Indian fisheries andcompared with reported results from selected non mechanised and motorised fishing systems to reflect the situation during 1997-1998. Among the fishharvesting systems studied, GER t fish-1 ranged from 5.54 and 5.91 GJ, respectively, for wooden and steel purse seiners powered by 156 hp engines; 6.40 GJ for wooden purse seiner with 235 hp engine; 25.18 GJ for mechanised gillnet/line fishing vessel with 89 hp engines; to 31.40 and 36.97 GJ, respectively, for wooden and steel trawlers powered by 99-106 hp engines.
    Keywords: Fisheries ; Energy analysis ; Gross Energy Requirement (GER) ; gillnetting ; lining ; trawling ; purse seining
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 27-35
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  • 2
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    Performance of 25m large mesh demersal trawl off Veraval, north west coast of India (2021)
    In:  http://aquaticcommons.org/id/eprint/18836 | 12051 | 2015-11-17 22:02:09 | 18836 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-12
    Description: Performance of a 25m large mesh demersal trawl, with 150mm mesh size in the fore parts of the trawl was evaluated in comparison with one boat high opening trawl of the Bay of Bengal Programme (BOBP) with 360 meshes of 160mm mesh size and 25.6m head rope length. An 8.2% increase in catch was obtained by 25m large mesh demersal trawl. The gear is comparatively cheaper, lighter in construction and offered better horizontal spread with significantly lower towing resistance. Commercial suitability of the gear for efficient harvesting of demersal fish resources of the region is discussed.
    Keywords: Fisheries ; gear selectivity ; fishing gear ; trawl nets ; demersal fishes ; Veraval ; Kerala ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 95-99
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  • 3
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    Fishing capacity management (2021)
    In:  boopendranath@hotmail.com | http://aquaticcommons.org/id/eprint/2005 | 328 | 2013-02-01 14:46:56 | 2005 | Central Institute of Fisheries Technology Cochin
    Details
    Publication Date: 2021-07-11
    Description: Excess fishing capacity has been identified as one of the most pernicious problems affecting long-term sustainability and biodiversity of fishery resources and economic viability of fishing operations. Significant economic gains could be achieved by eliminating excess capacity, in addition to attaining objectives of resource sustainability. In this paper, approaches to fishing capacity management are reviewed in the context of Indian fisheries. A rights based regulated access system under a co-management regime based on a strong inclusive cooperative movement of stakeholders with built-in transferable quota system and buy-back or rotational right of entry schemes seems to hold potential for capacity management in the shelf fisheries of Indian states, which need to be implemented in collaboration with the Union Government and the neighboring states with confluent ecosystems and shared fishing grounds. A key advantage of the use of rights based approaches for managing fishing capacity is that they provide a mechanism through which stakeholders can more easily and actively participate in the management process.
    Description: Integrated Fisheries Project
    Description: Published in Spearheading Quality Fish Processing: IFP Souvenir 2007, pp. 115-122
    Keywords: Conservation ; Fisheries ; Fishing capacity management ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 7-14
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  • 4
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    Waste minimisation in fishing operations (2021)
    In:  boopendranath@hotmail.com | http://aquaticcommons.org/id/eprint/9628 | 328 | 2020-08-24 04:28:23 | 9628 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-07
    Description: Sources of wastes in fishing operations mainlyinclude bycatch discards; processing wastes wherecatch is processed onboard; plastic wastes due toabandoned, lost and discarded fishing gear; bilgesand other wastes from the vessel operations. Fishingsystems in general have an associated catch of nontargetedorganisms known as bycatch. Non-selectivefishing gear that is not modified or equipped toexclude non-targeted organisms, may take a significantquantity of bycatch of non-targeted finfish,juvenile fish, benthic animals, marine mammals,marine birds and vulnerable or endangered speciesthat are often discarded. Average annual globaldiscards, has been estimated to be 7.3 million t,based on a weighted discard rate of 8%, during1992-2001 period. Trawl fisheries for shrimp anddemersal finfish account for over 50% of the totalestimated global discards. Plastic materials areextensively used in fisheries, owing to their durabilityand other desirable properties, contributing tothe efficiency and catchability of the fishing gear.However, plastics biodegrade at an extremely slowrate compared to other organic materials. Abandoned,lost or otherwise discarded fishing gear(ALDFG) and related marine debris have beenrecognized as a critical problem in the marineenvironment and for living marine resources.Prevention of excess fishing capacity by appropriatemanagement measures could lead to enormoussavings in terms of fuel consumption, emissions andbycatch discards from the excess fishing fleet, capitaland operational investments and labour deploymentin capture fisheries, with significant economic gains.In this paper, wastes originating from fishingoperations are reviewed, along with their environmentalimpacts and possible mitigation measures
    Keywords: Conservation ; Fisheries ; Capture fisheries ; bycatch ; discards ; bycatch reduction technologies ; plastic wastes ; garbage ; engine emissions ; waste minimization
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 109-119
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  • 5
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    Energy analysis of the ring seine operations, off Cochin, Kerala (2021)
    In:  http://aquaticcommons.org/id/eprint/9629 | 328 | 2020-08-24 04:29:25 | 9629 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-07
    Description: Ring seines are lightly constructed purse seinesadapted for operation in the traditional sector. Fishproduction and energy requirement in the ring seineoperations, off Cochin, Kerala, India are discussedin this paper, based on data collected during 1997-1998. The results reflect the Gross Energy Requirement(GER) situation that existed during 1997-1998.Mean catch per ring seiner per year worked out tobe 211.9 t of which sardines (Sardinella spp.)constituted 44.3%, followed by Indian mackerel(Rastrelliger kanagurta) 29.7%, carangids 11.4%,penaeid prawns 2.2%, pomfrets 1.1% and miscellaneousfish 11.3%. Total energy inputs into the ringseine operations were estimated to be 1300.8 GJ.Output by way of fish production was determinedto be 931.85 GJ. GER is the sum of all non-renewableenergy resources consumed in making available aproduct or service and is a measure of intensity ofnon-renewable resource use. GER per tonne of fishlanded by ring seiners was estimated to be 6.14.Among the operational inputs, kerosene constituted73.4% of the GER, followed by petrol (12.7%), diesel(6.7%) and lubricating oil (2.4%). Fishing gearcontributed 3.8%, engine 0.8% and fishing craft0.3% of the GER. Energy ratio for ring seining was0.72 and energy intensity 1.40.
    Keywords: Environment ; Fisheries ; Ring seine ; fish production ; Gross Energy Requirement
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 141-146
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  • 6
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    Energy efficiency in trawling operations (2021)
    In:  http://aquaticcommons.org/id/eprint/7508 | 328 | 2013-02-01 14:49:24 | 7508 | Central Institute of Fisheries Technology Cochin
    Details
    Publication Date: 2021-07-03
    Description: Diurnal variation in trawl catches and its influence on energy efficiency of trawler operations are discussed in this paper, based on data on landings of a Japanese factory trawler which operated in the Indian waters during 1992-93. The factory vessel equipped for stern trawling had a length overall of 110 m, GT of 5460 and installed engine power of 5700 hp. Operations were conducted off west coast of India between 31 and 278 m depth contours, using a 80.4 m high opening bottom trawl with an adjusted vertical opening of 7.60.9 m. The catch data was grouped according to the median towing hour, by the time of the day. CPUE obtained was 3713.4 kg.h-1 for day time operations and 1536.6 kg.h-1 for night-time operations. Mean daily catches were 31367 kg.day-1 (SE: 2743) for day time operations and 9430 kg.day-1 (SE: 966) for night-time operations. Fuel consumption were 0.399 and 0.982 kg fuel.kg fish-1, respectively for day and night-time operations. Total catch and catch components such as threadfin bream, bulls eye, hairtails, trevelly, lizard fish showed significant improvement during day-time operations while swarming crabs showed a significant improvement in the night-time operations. The difference in catch rates between day and night could be attributed to diurnal variation in the spatial distribution and schooling behaviour of the catch categories, their differential behaviour in the vicinity of trawl systems under varying light levels of day and night and consequent effect on catching efficiency and size selectivity at different stages in the capture process. The results obtained in addition to its importance in the operational planning of trawling in order to realise objectives of maximising catch per unit effort and minimising fuel consumption per unit volume of fish caught, has added significance in the use of bottom trawl surveys in stock abundance estimates.
    Keywords: Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 53-70
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  • 7
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    Studies on the suitability of HDPE material for gill nets (2021)
    In:  http://aquaticcommons.org/id/eprint/18816 | 12051 | 2015-11-17 17:10:44 | 18816 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-12
    Description: The suitability of HDPE yarn and HDPE twine in place of nylon for gill nets has been studied. As regards total catch nylon gill net is found to be better than HDPEnets. However, statistical analysis of the catch in respect of quality fishes shows that HDPE yarn nets are equally efficient as nylon nets.
    Keywords: Fisheries ; gear selectivity ; gill nets ; yarns ; gear materials
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 1-3
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  • 8
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    Studies on the effect of colour of webbing on the efficiency of gill nets for hilsa and pomfret off Veraval (2021)
    In:  http://aquaticcommons.org/id/eprint/18434 | 12051 | 2015-10-23 18:41:33 | 18434 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-09
    Description: Influence of colour of webbing on the catch of gill nets for commercially important hilsa (Hilsa toli and Hilsa ilisha) and pomfret (Pampus argenteus and Parastromateus niger) has been studied in the coastal waters off Veraval. Among the colours tested yellow and white are recommended for hilsa and pomfret gear. Influence of fishing depth, surface water temperature and turbidity on catch are also discussed.
    Keywords: Fisheries ; gill nets ; gear selectivity ; fishing gear ; coastal fisheries ; Pampus argenteus ; Parastromateus niger ; Veraval ; Gujarat ; Hilsa toli ; Hilsa ilisha
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 51-56
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  • 9
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    On the comparative efficiency of "V" shaped and rectangular flat otter boards for trawling off Veraval, north west coast of India (2021)
    In:  http://aquaticcommons.org/id/eprint/18450 | 12051 | 2015-10-27 15:59:30 | 18450 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-09
    Description: V shaped all steel boards, with their inherent stability to tide over obstacles and mud, interchangeability of starboard and portside boards are found to be superior to conventional flat rectangular boards for bottom trawling. These are cheaper in construction, offer less resistance and give longer service. Comparative trials with the two types of boards showed significant difference in tension between the boards but not in catch or horizontal opening.
    Keywords: Fisheries ; bottom trawls ; gear selectivity ; fishing gear ; otter boards ; Veraval ; Gujarat ; India
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 113-117
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  • 10
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    Effect of sailkite in improving trawl gear performance (2021)
    In:  http://aquaticcommons.org/id/eprint/18512 | 12051 | 2015-10-31 20:15:45 | 18512 | Society of Fisheries Technologists, India
    Details
    Publication Date: 2021-07-09
    Description: Effectiveness of sailkite has been evaluated in two trawl designs, namely, a 25m high opening trawl and a 32m large mesh demersal trawl, rigged with sailkite through full scale comparative field trials. A 25m high opening trawl showed significant increase in total catch by 54.4% ribbon fish (Trichiurus spp.) alone by 138.3% with a reduction in miscellaneous catch, comprising mostly small sciaenids and juvenile fish, by 13.2% while 32m large mesh demersal trawl showed an improvement in total catch by 9%, ribbon fish by 17.2% and miscellaneous catch by 7.7%. The difference in fishing performance between the two gear arrangements has been attributed to changed net mouth configuration because of higher head line lift and also the possible herding effect on the fish in the vicinity of trawl mouth, due to addition of sailkite.
    Keywords: Fisheries ; gear selectivity ; comparative studies ; gear construction ; trawl nets ; Trichiurus
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 45-48
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