Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 5
Primeira ... 1 ... Última
Imagem não selecionada

Imprime registro no formato completo
A review of fishery-independent assessment models, and initial evaluation based on simulated data ArchiMer
Mesnil, Benoit; Cotter, John; Fryer, Rob J.; Needle, Coby L.; Trenkel, Verena.
Large uncertainties in catch data (officially-reported landings and discards) are undermining the ability of scientific organisations to provide valid management advice based on the conventional approach of analytical stock assessments. There is thus an urgent need to consider alternative tools that do not depend on long series of precise age-structured catch data. This paper presents four fishery-independent assessment models developed under the EU project FISBOAT (Fishery Independent Survey Based Operational Assessment Tools). It also reports on rudimentary tests based on simulated data, using the same data sets and protocol as an evaluation study conducted by the US National Research Council in 1997. The survey-based assessment models at hand are able...
Tipo: Text Palavras-chave: Survey indices; Fishery independent assessment methods (F I methods); Catch free models; Fish stock assessment.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6902.pdf
Imagem não selecionada

Imprime registro no formato completo
Choosing survey time series for populations as part of an ecosystem approach to fishery management ArchiMer
Trenkel, Verena; Cotter, John.
Ecosystem assessments of fisheries based only on survey data will often have to use surveys that were designed historically for special purposes, e. g. for assessing abundances of two or three target species, or for tuning VPAs. An important question then is whether the previously collected data can provide informative time series of abundance indices and other state indicators for a wider range of target and non-target species. Some potential shortcomings of existing data series are treated in this paper leading to four questions which can guide the user to determine the suitability of an existing time series: did the survey cover the stock of each species adequately? Did survey catchability vary significantly between length or age classes? Did survey...
Tipo: Text Palavras-chave: Bias; Survey based methods; Indicators.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6900.pdf
Imagem não selecionada

Imprime registro no formato completo
Fish stock assessments using surveys and indicators ArchiMer
Petitgas, Pierre; Cotter, John; Trenkel, Verena; Mesnil, Benoit.
Tipo: Text
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6686.pdf
Imagem não selecionada

Imprime registro no formato completo
Notes on nine biological indicators estimable from trawl surveys with an illustrative assessment for North Sea cod ArchiMer
Cotter, John; Mesnil, Benoit; Witthames, Peter; Parker-humphreys, Matt.
This paper reviews a selection of nine indicators for assessing the biological state of a fish population monitored only by using trawl surveys in which catchability is assumed constant from time to time and place to place. The intention is to inform or remind of the range of possibilities and of associated practical and statistical issues. The indicators, grouped according to relationships with abundance, length, age, weight, and reproduction, are documented in a standard format covering estimation, interpretability, sensitivity, considerations for reference points where possible, and an example of their application. Lastly, selected indicators together with year-class curves fitted to abundance indices-at-age are applied to the North Sea cod to...
Tipo: Text Palavras-chave: Ecosystem approach to fisheries management; Year class curves; Weight index; Maturity stage; Age composition; Length based indicators; Biological indicators.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6901.pdf
Imagem não selecionada

Imprime registro no formato completo
Towards an ecosystem approach to fisheries management (EAFM) when trawl surveys provide the main source of information ArchiMer
Cotter, John; Petitgas, Pierre; Abella, Alvaro; Apostolaki, Panayiota; Mesnil, Benoit; Politou, Chrissi-yianna; Rivoirard, Jacques; Rochet, Marie-joelle; Spedicato, Maria Teresa; Trenkel, Verena; Woillez, Mathieu.
Ideas and considerations are put forward for managing fisheries and marine populations using primarily trawl surveys to supply biological and spatial indicators of the state of stocks, and to permit catch per unit effort (CPUE)-based assessments. Trawl surveys seldom allow absolute estimates of fish population sizes but, if appropriately located, timed, and designed, can provide a broad range of information about catchable fish species and the ecosystem that supports them. This information may be more conducive to sustainable management of fisheries than the traditional focus on the abundances of selected stocks. The paper first briefly proposes how survey-based methods might supplement existing fishery-dependent stock assessments, as would be necessary...
Tipo: Text Palavras-chave: Fishing effort indicator; Fisheries independent assessment; Survey based stock assessment; Spatial indicator; State indicator; Trawl survey; Fisheries management.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6691.pdf
Registros recuperados: 5
Primeira ... 1 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional