Results 231 to 240 of about 20,395 (262)
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Fisheries Research, 1989
Abstract This paper is the second part of a general programme to establish the real effectiveness of fishing gear. The data collected in the first part concerning cod gillnet effectiveness are now used together with such other data as could be gleaned to attempt a simulation model of the processes by which cod become caught in a bottom-set gillnet ...
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Abstract This paper is the second part of a general programme to establish the real effectiveness of fishing gear. The data collected in the first part concerning cod gillnet effectiveness are now used together with such other data as could be gleaned to attempt a simulation model of the processes by which cod become caught in a bottom-set gillnet ...
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Journal of the Fisheries Research Board of Canada, 1975
This paper reviews studies on gillnet selectivity: the relevant characteristics of fish and nets, graphical and mathematical representation of selectivity curves, and methods of estimation. F. I. Baranov started these studies 60 yr ago, and most subsequent work has been consistent with his axioms that a) gillnets catch fish whose head girths are ...
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This paper reviews studies on gillnet selectivity: the relevant characteristics of fish and nets, graphical and mathematical representation of selectivity curves, and methods of estimation. F. I. Baranov started these studies 60 yr ago, and most subsequent work has been consistent with his axioms that a) gillnets catch fish whose head girths are ...
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Effects on catch rates of baiting gillnets
Fisheries Research, 2000In this paper we investigate whether the use of bait on gillnets increases catch rates. Experiments were conducted during ordinary fishing in Norwegian waters for three different species; cod, ling and Greenland halibut. Each third gillnet of a fleet consisting of 24 nets was baited with mackerel. Catch rate of this experimental fleet was compared with
Arill Engås +2 more
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Fisheries Management and Ecology, 2020
Managing coastal resources sometimes requires looking into the past, as this provides a baseline against which present conditions may be gauged. The present study evaluated the circumstances that led Brazilian coastal fishers to modify their use of ...
J. A. Reis‐Filho
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Managing coastal resources sometimes requires looking into the past, as this provides a baseline against which present conditions may be gauged. The present study evaluated the circumstances that led Brazilian coastal fishers to modify their use of ...
J. A. Reis‐Filho
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Improved acoustic detection and identification of gillnets
Applied Acoustics, 2000Abstract A study of the acoustic backscattering produced by an array of scattering spheres fixed to a fishing net is reported. The system enhances net detection and also allows net identification by using a method in which the echogram is arranged to resemble a commercial bar-code.
Rafael Carbó, Adriana C Molero
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A new algorithm for estimating gillnet selectivity
Chinese Journal of Oceanology and Limnology, 2010The estimation of gear selectivity is a critical issue in fishery stock assessment and management. Several methods have been developed for estimating gillnet selectivity, but they all have their limitations, such as inappropriate objective function in data fitting, lack of unique estimates due to the difficulty in finding global minima in minimization,
Yanli Tang +4 more
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Fish morphology and estimating selectivity by gillnets
Fisheries Research, 1999Abstract A fleet of gillnets of various mesh sizes was fished in the Patos Lagoon, Brazil, to investigate how measurements of a fish's body can best be used to determine the selectivity by gillnets. Catch data were analysed for four morphologically dissimilar species: Micropogonias furnieri and Menticirrhus americanus (Sciaenidae), Mugil ...
E.G Reis, M.G Pawson
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Food and gear loss from selected gillnet and trammel net fisheries of India
, 2020This document is based on an assessment of fish and fishing gear loss from selected gillnet and trammel net fisheries of India. It presents information on the types, causes and levels of losses, as well as technological, social, environmental and policy ...
S. N. Thomas +9 more
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Evaluating catches of salmonids taken by gillnets
Journal of Fish Biology, 1995Data from 10 185 gillnetted brown trout (Salmo trutta L.) and 5777 Arctic charr [Salvelinus alpinus (L.)] were analysed. Relative to mesh size, the most efficiently caught fish length (the modal length) was somewhat larger with floated nets than with smaller nets placed on the bottom.
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Incidental Catch of Cetaceans with Salmon Gillnet
Journal of the Fisheries Research Board of Canada, 1975Using data on number of cetaceans caught per 1000 "tans" (= approximately 50 m) of salmon drift gillnet, incidental catch rates by salmon research vessels of the Japanese Fisheries Agency averaged 0.476. The maximum was 1.42. The average ranged between 0.37 and 0.65 from 1962 to 1971, indicating negligible effect on porpoise populations. These figures
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