Course material (FT)

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Now showing 1 - 20 of 41
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    Aimed fishing
    (Central Institute of Fisheries Technology, 2000) Vijayan, V.
    Aimed trawl fishing techniques involves searching for, finding and evaluating fish schools with the sonar, correctly navigating the vessel towards the selected school, establishing the accurate depth and configuration of the school by echo-sounding and steering the trawl to the required depth, as indicated by the net sonde.
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    Attraction of fish by lights, electricity, fads and artificial reefs
    (Central Institute of Fisheries Technology, 2000) Meenakumari, B.
    Now a days fishing is done in various ways. To attract fish to this purpose is also have a great sense.For this we have variety of methods invented. Fishing with lights, electricity, fads etc. are some of them.
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    Basic principles in fishing gear designs and fish capture
    (Central Institute of Fisheries Technology, 2000) Kunjipalu, K.K.
    Many factors enter into the choice of the fishing method and gear used to catch particular species of fish in a particular area. Some of them are discussed here.
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    Basic principles of fishing gear design and construction
    (Central Institude of Fisheries Technology, 2002) Boopendranath, M.R.
    Fishing gears have generally evolved on a trial and error basis and until recently, only empirical approaches have been used to determine design parameters rather than analytical procedures. Design and development efforts based fish behaviour, engineering studies, system analysis and model studies taking into consideration resource conservation, ecological and economic issues have been taking place in the recent decades. With the development and wider availability of synthetic gear materials, recent advances in vessel technology, navigational electronics, gear handling machinery, fish detection methods and fish behaviour studies, large-scale changes have taken place in the design, fabrication, operation and catching capacity of modern fishing gears such as trawls, purse seines and long lines. Widely used traditional fishing gears such as entangling nets, hook and lines and traps have also benefited by way of design upgradation and efficiency improvement in the recent years. New innovative fishing systems such as electrical fishing, light-assisted fishing, FAD-assisted fishing and fish pumps have also been developed and accepted in different parts of the world. Design process for fishing gear has been greatly influenced in the recent years by the resource management and conservation, environmental safety and energy efficiency imperatives.
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    Behaviour of fish in relation to fishing gear and methods
    (Central Institute of Fisheries Technology, 2000) Kunjipalu, K.K.
    Knowledge of the behaviour of fish in relation to fishing gear and fishing methods is a requisite to design, construct and operate fishing gears effectively. Few studies have been made in this line mainly due to difficulties of making underwater observations and measurements in the vicinity of fishing gears, especially in deeper waters. Light meters, and other instruments for measuring the stimuli produced by fishing gears and the fish themselves have been of major significance to study fish behaviour.
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    Behaviour of marine hardware materials in the marine environment
    (Central Institude of Fisheries Technology, 2002) Ravindran, K.
    Seawater, which covers more than 70 % of the earth’s surface, is a complex electrolyte containing living matter, suspended silt, dissolved gases and decaying organic materials. Seawater is the most abundant naturally occurring electrolyte. It is also one of the most corrosive natural environment. Despite variations in salinity, temperature and growth of marine organisms from place to place, the general pattern of corrosion of materials remains the same throughout the world. Depending upon the marine zone to which the metals are exposed, the rate of deterioration varies.
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    Classification of fishing boats
    (Central Institute of Fisheries Technology, 2000) Edwin, L.
    The term "fishery vessel" comprises mobile floating objects of any kind and size operating in fresh water, brackish water and marine areas and used for catching, transporting, landing, preserving and/or processing of fish, shell fish and other aquatic vessels performing other functions related to fisheries such as supplying, protecting, rendering assistance or conducting research or training. The term "Fishing vessel" is used to distinguish fishing vessels engaged in catching operations. The remaining fishery vessels are covered by the term "non fishing vessels".
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    Commercial fishing methods
    (Central Institute of Fisheries Technology, 2000) Kunjipalu, K.K.
    The bulk of the world's seafood supply continues to come from the stocks of ocean fish and other marine creatures. To many the methods and equipments used by fisherman appear to be crude and unsophisticated. Technology, sophistication, complexity and investment in vessels and equipment, together with techniques of finding fish and onboard transportation of fish and post harvest technologies are showing rapid growth. Increasing investment in research and development is continuously improving the efficiency of operations and conditions under which fishermen work.
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    Deck layout and onboard facilities for trawlers, purse seiners and longiliners
    (Central Institute of Fisheries Technology, 2000) Manohardoss, R.S.
    The design, construction and operation of fishing vessels deserve the most important attention. The deck layouts and onboard facilities of different types of fishing vessels namely Trawlers, Purse Seiners and Longliners are described in this paper.
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    Demersal trawling operation
    (Central Institude of Fisheries Technology, 2002) Pravin, P.
    The demersal trawl is designed and rigged to have bottom contact during fishing and is, depending on the bottom substrate equipped with different kinds of ground rope for the purpose of shielding lower leading margin of the trawl from ground damage whilst maintaining ground contact and easy move on the bottom.The different methods of demersal trawling is discussed in this paper.
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    Demersal trawls
    (Central Institute of Fisheries Technology, 2002) Ramesan, M.P.
    Demersal trawling continues to be one of the most important fishing methods of the world. In India bottom trawl fishing was first introduced in late 1940’s by Exploratory Fisheries Project. It has taken several years to reach the trawl design, rigging and operational procedures to the present state.
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    Design concept, rigging and operation of pelagic and semi-pelagic trawls
    (Central Institute of Fisheries Technology, 2000) Vijayan, V.
    Technological advances are essential part of any industry for furtherance and development and fishing can be no exception.The increase in production in capture fisheries was 6.0 to 6.5% per year. So that it causes the reduction in production. Increasing scarcity of fish was met with new technology to improve the performance of the gear, fleet and vessels. Diversification of fishing methods has contributed to this development and semipelagic trawling is one among diversified trawling methods. Target specific trawls were to meet this requirement and pelagic and semipelagic trawls contribute enormously in this direction.
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    Design concept, rigging and operation of pelagic and semi-pelagic trawls
    (Central Institute of Fisheries Technology, 2000) Vijayan, V.
    Mid-water trawls also known as floating trawls or pelagic trawls have been introduced in the commercial fisheries to exploit concentration of fish in water layers away from the sea-bed. Detailed study on this is discussed here.
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    Design of purse seines and fishing method
    (Central Institute of Fisheries Technology, 2000) Kunjipalu, K.K.
    Purse seine is a long wall of webbing without prominent bunt or bag. Webbing almost hangs straight down between float and lead lines. Main body is with uniform mesh. After encircling, seine is pulled aboard from one end only to concentrate fish on the other end.
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    Electronic instruments for fishing gear research
    (Central Institute of Fisheries Technology, 2000) Ramakrishnan, K.
    Technological improvements especially in the field of marine electronics has contributed to the development of very efficient electronic instruments for precise measurement of the operational parameters.
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    Fisheries hydrography
    (Central Institute of Fisheries Technology, 2002) Prakash, R.R.
    Fisheries hydrography relies upon the basic sciences – physics, chemistry and pure biology – as well as composite sciences such as ecology and marine geology. Fisheries hydrography is the study and application of oceanography, maritime meteorology and aquatic ecology to those practical problems in fisheries which are related to the productivity of the oceans or to the fishery resources, to the behaviour (aggregation, dispersion, migration, etc.) of various specimens belonging to the marine biomass, to the availability of fish and other fishable marine animals to the fisheries, and to the effects of oceanographic and meteorological conditions on the conduct of fishery.
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    Fishing craft materials
    (Central Institute of Fisheries Technology, 2002) Edwin, L.
    Newer materials like fibreglass, ferrocement and aluminium are coming up as suitable substitutes for wood as this conventional material has started becoming scarce and therefore very costly. As regards service life under critical conditions the new materials show promise, however wood and steel permit greater versatility due to their well-known characteristics and working qualities which are discussed in this paper.
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    Fishing gear for reservoirs and inland water
    (Central Institute of Fisheries Technology, 2000) Dawson, P.
    India is one of the leading centres in the world in inland water resources, which are in the form of tanks, estuaries, brackish water lakes, swamps and paddy fields. Over the years, India has ;built a large number of dams and barrages to harness the water potential for irrigation, generation of electricity, navigation and fisheries. Of these, reservoir constitute the prime inland fisheries resources. Based on the available records fresh water lakes constitute 2,588,000 ha. Exploitation of fisheries in these areas was insignificant in the earlier years, fishing being conducted purely on a subsistence level. The last few decades have witnessed many technological advances in fishing techniques.
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    Fishing gear materials
    (Central Institute of Fisheries Technology, 2000) Meenakumari, B.
    Textile fibres form the basic material for the preparation of netting yams. These can be broadly classified as natural fibres and man made fibres. Natural fibres are grouped into two, fibres of animal origin and vegetable origin of which the latter alone has significance in the fishing industry. Man made fibres are classified as natural polymers manufactured by the alteration of natural polymers like cellulose and protein and synthetic polymers obtained by synthesis or chemical process of which synthetic polymers are used for netting yams.
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    Gill net selectivty
    (Central Institude of Fisheries Technology, 2002) Thomas, S.N.
    Selectivity is an important tool for effective management of fisheries. It is defined as the ability to target and capture fish by species, size or sex or a combination of these during harvesting operation, allowing all incidental by catch to be released unharmed. By regulating the minimum mesh size of a fishing fleet, the minimum landing size of the target species can be determined. Several researchers stress the importance of selecting the optimum mesh size from the standpoint of conservation of population.