Results 151 to 160 of about 1,344 (194)
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Fisheries Research, 2009
To improve the accuracy of fish population estimates, understanding the deficiencies of fish sampling methods is important. Gillnets are a passive and selective gear and give biased estimates of abundance and distribution of species and their size structure. By comparing gillnet results with those of active gear (e.g.
M Olin
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To improve the accuracy of fish population estimates, understanding the deficiencies of fish sampling methods is important. Gillnets are a passive and selective gear and give biased estimates of abundance and distribution of species and their size structure. By comparing gillnet results with those of active gear (e.g.
M Olin
exaly +2 more sources
Statics of a gillnet placed in a uniform current
Ocean Engineering, 2004Abstract The configuration and tension distribution of a gillnet are very important for catching fish. A nonlinear mixed method is employed to determine the equilibrium configuration and tension distribution of a gillnet set in a uniform current, based on a finite element formulation a gillnet composed of mesh bars and ropes can be modeled as an ...
Tadashi Tokai
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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 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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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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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 Study on Karaduvar Trammel and Gillnets Fisheries
2020Sustainable management requires not only structural analysis but also socio-structural analysis. Therefore, structural analysis and the socio-cultural structure of the fishery need to be found out for the sustainable management for small-scale fishery of trammel nets at Karaduvar Fishermen Harbour.
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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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Experimental studies of Pacific herring gillnets
Fisheries Research, 1986Abstract Gillnet selectivity in the Pacific herring roe fishery was examined using experimental apparatus. Estimates of size-specific selectivity of monofilament gillnets were calculated by comparing numbers and lengths of fish retained in nets with those that swam through the net into a trap.
D.E. Hay, K.D. Cooke, C.V. Gissing
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