An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock
The aim of this paper is to present the status of NAFO roughhead grenadier Subarea 2 and 3 stock based on different assessments models using all the available information. Different assessment methods have been applied based on the data available: Extended Survivors Analysis, a Stock-Production Mode...
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ftieo:oai:repositorio.ieo.es:10508/1720 2023-05-15T17:34:47+02:00 An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock González-Costas, F. (Fernando) Atlantic Ocean North Atlantic Northwest Atlantic NAFO 2013 http://hdl.handle.net/10508/1720 eng eng Northwest Atlantic Fisheries Organization (NAFO) Centro Oceanográfico de Vigo http://hdl.handle.net/10508/1720 González-Costas, F. 2013. An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock. NAFO Sci. Coun. Res. Doc. 13/027, Serial Nº N6180: 40p. Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess CC-BY-NC-ND workingPaper 2013 ftieo 2022-07-26T23:47:06Z The aim of this paper is to present the status of NAFO roughhead grenadier Subarea 2 and 3 stock based on different assessments models using all the available information. Different assessment methods have been applied based on the data available: Extended Survivors Analysis, a Stock-Production Model Incorporating Covariates (ASPIC) and a qualitative assessment based on survey and fishery information. XSA results are considered uncertainties due to the low Fishing mortality estimated compare with the natural mortality level assumed and the high number of iterations needed to reach the convergence. ASPIC results make sense with historical data available for this stock despite the uncertainty in the B1/K parameter and the low contrast index value. Although all these problem both models results present a very similar trend in the fishing mortality and biomass values and are comparable to the qualitative assessment base on the surveys information. Biomass presents in all methods a general increased trend in the 1995-2006 period and between 2006 and 2009 is more or less stable at high levels. Between 2009-2012 presents a decreasing trend in the surveys indices and XSA results however remains stable at high levels in the ASPIC results. Trends of the different estimations of F were very similar. F presents a decreasing trend since 1998 till 2006 and since then is more or less stable at very low levels. All recruitment indices analysed show a clear recruitment pick around 2004 and the XSA and survey length abundance show other quite good recruitment in 2012 despite the difficult to follow cohorts strength. Report North Atlantic Northwest Atlantic Instituto Español de Oceanografía: e-IEO |
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Instituto Español de Oceanografía: e-IEO |
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ftieo |
language |
English |
description |
The aim of this paper is to present the status of NAFO roughhead grenadier Subarea 2 and 3 stock based on different assessments models using all the available information. Different assessment methods have been applied based on the data available: Extended Survivors Analysis, a Stock-Production Model Incorporating Covariates (ASPIC) and a qualitative assessment based on survey and fishery information. XSA results are considered uncertainties due to the low Fishing mortality estimated compare with the natural mortality level assumed and the high number of iterations needed to reach the convergence. ASPIC results make sense with historical data available for this stock despite the uncertainty in the B1/K parameter and the low contrast index value. Although all these problem both models results present a very similar trend in the fishing mortality and biomass values and are comparable to the qualitative assessment base on the surveys information. Biomass presents in all methods a general increased trend in the 1995-2006 period and between 2006 and 2009 is more or less stable at high levels. Between 2009-2012 presents a decreasing trend in the surveys indices and XSA results however remains stable at high levels in the ASPIC results. Trends of the different estimations of F were very similar. F presents a decreasing trend since 1998 till 2006 and since then is more or less stable at very low levels. All recruitment indices analysed show a clear recruitment pick around 2004 and the XSA and survey length abundance show other quite good recruitment in 2012 despite the difficult to follow cohorts strength. |
format |
Report |
author |
González-Costas, F. (Fernando) |
spellingShingle |
González-Costas, F. (Fernando) An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock |
author_facet |
González-Costas, F. (Fernando) |
author_sort |
González-Costas, F. (Fernando) |
title |
An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock |
title_short |
An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock |
title_full |
An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock |
title_fullStr |
An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock |
title_full_unstemmed |
An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock |
title_sort |
assessment of nafo roughhead grenadier subarea 2 and 3 stock |
publisher |
Northwest Atlantic Fisheries Organization (NAFO) |
publishDate |
2013 |
url |
http://hdl.handle.net/10508/1720 |
op_coverage |
Atlantic Ocean North Atlantic Northwest Atlantic NAFO |
genre |
North Atlantic Northwest Atlantic |
genre_facet |
North Atlantic Northwest Atlantic |
op_relation |
http://hdl.handle.net/10508/1720 González-Costas, F. 2013. An assessment of NAFO roughhead grenadier Subarea 2 and 3 stock. NAFO Sci. Coun. Res. Doc. 13/027, Serial Nº N6180: 40p. |
op_rights |
Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess |
op_rightsnorm |
CC-BY-NC-ND |
_version_ |
1766133718835003392 |