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| Loaec, Henri; Morandeau, Fabien; Meillat, Marc; Davies, Peter. |
| There are different approaches to selectivity, including increasing cod-end mesh size, square mesh panels and rigid grids. Selectivity grids have traditionally been produced to be as rigid as possible to maintain spacing but this can result in heavy, expensive grids, handling problems and brittleness. This paper presents an alternative approach using flexible polyurethane polymers to produce lightweight inexpensive grids with much improved damage tolerance and ease of handling, which also possess interesting selectivity characteristics. The material selection, design and development tests are described first, then preliminary sea trial results are presented. A flexible grid with a 20 mm spacing between bars performed successfully and enabled a reduction in... |
| Tipo: Text |
Palavras-chave: Damage resistance; Polyurethane; Nephrops; Grid; Size selection; By catch; Selectivity. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1690.pdf |
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| Cezar,Everson; Nanni,Marcos Rafael; Demattê,José Alexandre M.; Chicati,Marcelo Luiz; Oliveira,Roney Berti de. |
| Diversos avanços têm sido conquistados no campo da espectrorradiometria difusa, nas últimas décadas. Na área agrícola, a busca por métodos de quantificação de atributos físicos e químicos do ambiente de produção, com base na reflectância do solo, tem sido pesquisada constantemente. O objetivo deste trabalho foi avaliar a possibilidade de estimar os teores de silte, areia, argila, soma de bases, matéria orgânica e ferro total em amostras de solo, a partir de sua energia refletida. As amostras foram coletadas em uma área de 2.500 ha, localizada na região noroeste paranaense, composta por solos das classes Latossolo Vermelho, Nitossolo Vermelho, Argissolo Vermelho, Cambissolo Háplico e Neossolo Quartzarênico. As profundidades de amostragem foram de 0-0,2 e... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Reflectância; Grid; Regressão linear múltipla; Predição. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832013000400004 |
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| Meillat, Marc; Dupouy, Herve; Bavouzet, Gerard; Kergoat, B.; Morandeau, Fabien; Gaudou, Olivier; Vacherot, Jean-philippe. |
| The fishery for benthic species (Monkfish, Megrim, Rays, etc ... ) represents for the surrounder countries of the Celtic Sea and the Bay of Biscaye one of the most important activities . An estimate of the discards of the main species resulting from the sorting practice onboard of the trawlers participating in this fishery was made in 1985 and 1991. it was concluded that an important quantity of juveniles of Rays, Megrim and Monkfish are discarded each year causing an important mortality. The aim of the present paper is to present the preliminary results of a selectivity grid fixed on a bottom trawl to limit as possible the discards. Three different grids were tested at sea during surveys with different results. The major problem is due to difference in... |
| Tipo: Text |
Palavras-chave: Chalut sélectif; Grille; Mer Celtique; Golfe de Gascogne; Baudroies; Sardines; Raies; Selectivity; Grid; Trawl; Celtic Sea; Bay of Biscaye; Monkfish; Megrim; Rays. |
| Ano: 1991 |
URL: https://archimer.ifremer.fr/doc/00394/50567/51258.pdf |
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