Small-scale Fishing with Driftnets
Small-scale Fishing with Driftnets

Author: Ludvik Karlsen

Publisher: Food & Agriculture Org.

Published: 1987

Total Pages: 76

ISBN-13: 9789251025253

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Driftnetting offers considerable advantages over anchored or bottom-set gillnetting as it can be conducted by artisanal fishermen without any mechanical assistance and regardless of the water depth. The paper provides guidance for ypgrading of fishing technology in relation to gillnetting with emphasis on the needs of developing fisheries, advantages and disadvantages of various gear materials and appropriate fishing methods and technology for optimizing fish capture and fishing operations with driftnets. Simple and easily understood drawings of driftnet fishing gear and methods are provided for the benefit of the fishermen themselves. For teaching and training purposes, there are technical details and cacluations for rigging of driftnets. Information is provided on gear and methods used in some well-known driftnet fisheries in Europe and the Far East. Particular attention is given to the selction and calculation of material needed to construct a driftnet and the importance of safe operation.

Modern Fishing Gear of the World
Modern Fishing Gear of the World

Author: Hilmar Kristjonsson

Publisher:

Published: 1959

Total Pages: 692

ISBN-13:

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Vol. 1 contains the [Papers and proceedings of the first Congress]-v. 2: "From the papers and discussions at the second FAO World Fishing Gear Congress, arranged by the Technical Staffs of Fishing news international and Fishing news.--v. 3: Fish finding, purse seining [and] aimed trawling.

Selectivity of Gill Nets on Spanish Mackerel, Scomberomorus Maculatus, King Mackerel, S. Cavalla, and Bluefish, Pomatomus Saltatrix
Selectivity of Gill Nets on Spanish Mackerel, Scomberomorus Maculatus, King Mackerel, S. Cavalla, and Bluefish, Pomatomus Saltatrix

Author: Lee Trent

Publisher:

Published: 1983

Total Pages: 40

ISBN-13:

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Information from experimental settings of gill nets reported in the literature and data taken from commercial fishermen in Florida from 1973 to 1981 were used to analyze gill net selection on Spanish mackerel, Scomberomorus maculatus, king mackerel, S. cavalla, and bluefish, Pomatomus saltatrix from Florida and Serra Spanish-mackerel, S. braziliensis, from Brazil. The information on Spanish mackerel and bluefish obtained from the commercial gillnet fishedes did not further our understanding of selectivity over that produced by experimental nettings except in defining girth-length relations. The commercial fisheries data appeared to reflect mostly the sizes of fish that were abundant at the time of capture ratner than the effects of selectivity. We did use commercial fisheries data for describing selectivity of king mackerel, however, because we had other estimates of the size compositions of the populations to adjust the gillnet distributions for unequal numbers of fish in the length intervals. Selectivity was evaluated under the assumptions that: (1) the selectivity curve would take the form of a normal frequency distribution; (2) the efficiencies of two nets with different mesh sizes would be similar for fish of their respective lengths; and (3) the standard deviations of the distributions for two different mesh sizes would be equal. Under these assumptions the computed mean selection lengths in relation to mesh size and species- were: Spanish mackerel - 6.3 cm stretched mesh, 30.8 cm fork length; 7.0 cm SM, 33.9 cm FL; 7.6 cm SM, 37.0 cm FL; 8.2 cm SM, 40.1 cm FL; 8.9 cm SM. 43.2 cm FL; and 9.5 cm SM, 46. 3 cm FL. Bluefish - 6.3 cm SM, 28.5 cm FL; 7.0 cm SM, 31.4 cm FL; 7.6 cm SM, 34.2 cm FL; 8.2 cm SM. 37.1 cm FL; and 8.9 cm SM, 40.0 cm FL. King mackerel - 12.1 cm 5M, 92.-1 cm FL. Serra Spanish mackerel - 6.0 cm SM. 42. 1 cm FL; 8.0 cm SM. 43.6 cm FL; and YO cm SM, 55.2 cm FL.