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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.
Olin, M., Malinen, T., Ruuhijärvi, J.
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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.
Olin, M., Malinen, T., Ruuhijärvi, J.
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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
exaly +2 more sources
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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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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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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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 ...
R. Wan +4 more
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Variations in Catchability of Fishes with Color of Gillnets
Transactions of the American Fisheries Society, 1973Abstract Gillnets of nine colors were compared with white nylon to determine effects of each color on catch rates of numbers and weights of 15 species of fishes in Elephant Butte Lake. Data were analyzed with mixed-model analysis of variance. Significantly different catch rates were compared, as fractions of unity (ratios), with rates in white nets ...
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Mitigating unaccounted fishing mortality from gillnets and traps
Fish and Fisheries, 2013AbstractGillnets and traps often are considered to have fewer holistic environmental impacts than active fishing gears. However, in addition to the targeted catches, gillnets and traps still cause unwanted mortalities due to (i) discarding, (ii) ghost fishing of derelict gear, (iii) depredation, (iv) escaping or dropping out of gear, (v) habitat damage,
Uhlmann, Sebastian S. +1 more
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