Nephrops biomass index estimation from GALNEP26_2021 Survey in FU26 (West Galicia, ICES Division 9a)
Marin Fishing Industry (OPROMAR, Productores de Pesca Fresca del Puerto y la Ría de Marín) promoted a survey onboard a commercial vessel in order to estimate a Nephrops biomass index in FU26 with an observer onboard and the supervision of IEO since 2019. GALNEP26_2021 survey was conducted from 19th...
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Centro Oceanográfico de Cádiz
2022
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ftieo:oai:repositorio.ieo.es:10508/16260 2023-05-15T17:35:36+02:00 Nephrops biomass index estimation from GALNEP26_2021 Survey in FU26 (West Galicia, ICES Division 9a) Vila, Y. (Yolanda) Salinas-Aguilera, M.I. (Miren Itxaso) Océan atlantique Atlantique Nord Atlantic Ocean Atlántico Norte Océano Atlántico ICES North Atlantic 2022-06 http://hdl.handle.net/10508/16260 eng eng Centro Oceanográfico de Cádiz http://hdl.handle.net/10508/16260 ICES Working Group for the Bay of Biscay and the Iberian Waters Ecoregion (WGBIE). (02/05/2022 - 13/05/2022. On-line Meeting). 2022. Atribución-NoComercial-SinDerivadas 3.0 España http://creativecommons.org/licenses/by-nc-nd/3.0/es/ openAccess CC-BY-NC-ND Nephrops FU2627 abundance index survey biomass length frequency time series analysis spatial analysis workingPaper 2022 ftieo 2022-10-04T23:46:48Z Marin Fishing Industry (OPROMAR, Productores de Pesca Fresca del Puerto y la Ría de Marín) promoted a survey onboard a commercial vessel in order to estimate a Nephrops biomass index in FU26 with an observer onboard and the supervision of IEO since 2019. GALNEP26_2021 survey was conducted from 19th to 28th July 2021, following a systematic sampling over a 5x5 nm grid. Area survey was established on the base on the VMS analysis together the bottoms trawl logbooks in the 2009-2017 period. Additionally, sediment composition (EDMOnet) was taken account and gravel and rocky bottoms were eliminated in the area delimited by VMS. Survey was carried out by a unique commercial vessel (27.9 m Length, 109.17 TRB, 430 hp & 70 mm mesh size). The main objectives of GALNEP26_2021 survey were to estimate: the Nephrops abundance index, the discard rate and the size composition for both sexes in this FU. Nephrops total catches were 78 kg, representing lower than 1% of the total retained catch. Discard rate was very low and it was considered negligible. Survey index was 0.95 Kg/h with 95% confident of 1.31. Hauls positive in Nephrops were 18 of a total of 41 hauls carried out during the survey. Spatial analysis of the survey index shows Nephrops is concentrated in a small area on the Northwest half within the historical area distribution in FU26 although low Nephrops catches were obtained in the shallower and deeper part of the south of the area. The mean length was 35.0 mm CL for females and 41.9 mm CL for males. Sex-ratio was estimated in almost 50%. Report North Atlantic Instituto Español de Oceanografía: e-IEO |
institution |
Open Polar |
collection |
Instituto Español de Oceanografía: e-IEO |
op_collection_id |
ftieo |
language |
English |
topic |
Nephrops FU2627 abundance index survey biomass length frequency time series analysis spatial analysis |
spellingShingle |
Nephrops FU2627 abundance index survey biomass length frequency time series analysis spatial analysis Vila, Y. (Yolanda) Salinas-Aguilera, M.I. (Miren Itxaso) Nephrops biomass index estimation from GALNEP26_2021 Survey in FU26 (West Galicia, ICES Division 9a) |
topic_facet |
Nephrops FU2627 abundance index survey biomass length frequency time series analysis spatial analysis |
description |
Marin Fishing Industry (OPROMAR, Productores de Pesca Fresca del Puerto y la Ría de Marín) promoted a survey onboard a commercial vessel in order to estimate a Nephrops biomass index in FU26 with an observer onboard and the supervision of IEO since 2019. GALNEP26_2021 survey was conducted from 19th to 28th July 2021, following a systematic sampling over a 5x5 nm grid. Area survey was established on the base on the VMS analysis together the bottoms trawl logbooks in the 2009-2017 period. Additionally, sediment composition (EDMOnet) was taken account and gravel and rocky bottoms were eliminated in the area delimited by VMS. Survey was carried out by a unique commercial vessel (27.9 m Length, 109.17 TRB, 430 hp & 70 mm mesh size). The main objectives of GALNEP26_2021 survey were to estimate: the Nephrops abundance index, the discard rate and the size composition for both sexes in this FU. Nephrops total catches were 78 kg, representing lower than 1% of the total retained catch. Discard rate was very low and it was considered negligible. Survey index was 0.95 Kg/h with 95% confident of 1.31. Hauls positive in Nephrops were 18 of a total of 41 hauls carried out during the survey. Spatial analysis of the survey index shows Nephrops is concentrated in a small area on the Northwest half within the historical area distribution in FU26 although low Nephrops catches were obtained in the shallower and deeper part of the south of the area. The mean length was 35.0 mm CL for females and 41.9 mm CL for males. Sex-ratio was estimated in almost 50%. |
format |
Report |
author |
Vila, Y. (Yolanda) Salinas-Aguilera, M.I. (Miren Itxaso) |
author_facet |
Vila, Y. (Yolanda) Salinas-Aguilera, M.I. (Miren Itxaso) |
author_sort |
Vila, Y. (Yolanda) |
title |
Nephrops biomass index estimation from GALNEP26_2021 Survey in FU26 (West Galicia, ICES Division 9a) |
title_short |
Nephrops biomass index estimation from GALNEP26_2021 Survey in FU26 (West Galicia, ICES Division 9a) |
title_full |
Nephrops biomass index estimation from GALNEP26_2021 Survey in FU26 (West Galicia, ICES Division 9a) |
title_fullStr |
Nephrops biomass index estimation from GALNEP26_2021 Survey in FU26 (West Galicia, ICES Division 9a) |
title_full_unstemmed |
Nephrops biomass index estimation from GALNEP26_2021 Survey in FU26 (West Galicia, ICES Division 9a) |
title_sort |
nephrops biomass index estimation from galnep26_2021 survey in fu26 (west galicia, ices division 9a) |
publisher |
Centro Oceanográfico de Cádiz |
publishDate |
2022 |
url |
http://hdl.handle.net/10508/16260 |
op_coverage |
Océan atlantique Atlantique Nord Atlantic Ocean Atlántico Norte Océano Atlántico ICES North Atlantic |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
http://hdl.handle.net/10508/16260 ICES Working Group for the Bay of Biscay and the Iberian Waters Ecoregion (WGBIE). (02/05/2022 - 13/05/2022. On-line Meeting). 2022. |
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_ |
1766134816567197696 |