Analysis of Spanish acoustic surveys for sardine, 1991–1993: abundance estimates and inter-annual variability
Systematic acoustic surveys to estimate the Spanish fraction of the Atlantic Sardine Stock were begun in 1983. Since 1991, with the use ofthe new Sirnrad EK-500 echosounder-echointegrator, the covered area has been extended to 1000 m isobath to observe the distribution of the main pelagic species in...
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Language: | English |
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International Council for the Exploration of the Sea (ICES)
1996
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Online Access: | http://hdl.handle.net/10508/1629 http://hdl.handle.net/10261/327912 https://doi.org/10.1006/jmsc.1996.0060 |
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ftcsic:oai:digital.csic.es:10261/327912 2024-02-11T10:07:02+01:00 Analysis of Spanish acoustic surveys for sardine, 1991–1993: abundance estimates and inter-annual variability Porteiro-Lago, Carmen Carrera, Pablo Miquel-Batle, Joan Atlantic Ocean Eastern Atlantic Northeast Atlantic Iberian waters 1996 http://hdl.handle.net/10508/1629 http://hdl.handle.net/10261/327912 https://doi.org/10.1006/jmsc.1996.0060 en eng International Council for the Exploration of the Sea (ICES) Centro Oceanográfico de Vigo http://icesjms.oxfordjournals.org/content/53/2/429.abstract?sid=dac47477-4e1d-411c-85a7-8d583b11753d Porteiro, C. Carrera, P. Miquel, J. (1996) Analysis of Spanish acoustic surveys for sardine 1991-1993: abundance estimates and inter-annual variability. ICES Journal of Marine Science 53 (2); 429-433 http://hdl.handle.net/10508/1629 http://hdl.handle.net/10261/327912 doi:10.1006/jmsc.1996.0060 open Centro Oceanográfico de Vigo Acoustic survey Pesquerías Sardina pilchardus spatial distribution geostatistics Iberian Península artículo http://purl.org/coar/resource_type/c_6501 1996 ftcsic https://doi.org/10.1006/jmsc.1996.0060 2024-01-16T11:49:08Z Systematic acoustic surveys to estimate the Spanish fraction of the Atlantic Sardine Stock were begun in 1983. Since 1991, with the use ofthe new Sirnrad EK-500 echosounder-echointegrator, the covered area has been extended to 1000 m isobath to observe the distribution of the main pelagic species in the area. The last three surveys, from spring 1991 to 1993, had a range of 20 to 1000 m isobath. They were first analysed using the traditional methodology proposed in Pastor el al (1986) which do es not give any estimation ofthe variance. Therefore, the data was then analysed using geostatistic techniques, and the resulting relative abundance estimates were compared. Sardine showed high variability between years and zones in both distribution area and density, expressed as number of fish per square nautical mile. The two methods of analysis gave different biomass estimates by zone, especially in 1993. Variograms computed over areas of fish presence did not show, in general, a clear spatial structure and sills were reached at 3 n.m. of range. The precision ofthese variograms was low, ranging from 23% to 40 %, expressed as relative standard error. In order to improve precision it seems necessary to increase the sampling intensity and change the survey grid. For sardine, a systematic parallel with random start survey design, with 6 n.m. between transects, would be more appropriate. Article in Journal/Newspaper Northeast Atlantic Digital.CSIC (Spanish National Research Council) ICES Journal of Marine Science 53 2 429 433 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Centro Oceanográfico de Vigo Acoustic survey Pesquerías Sardina pilchardus spatial distribution geostatistics Iberian Península |
spellingShingle |
Centro Oceanográfico de Vigo Acoustic survey Pesquerías Sardina pilchardus spatial distribution geostatistics Iberian Península Porteiro-Lago, Carmen Carrera, Pablo Miquel-Batle, Joan Analysis of Spanish acoustic surveys for sardine, 1991–1993: abundance estimates and inter-annual variability |
topic_facet |
Centro Oceanográfico de Vigo Acoustic survey Pesquerías Sardina pilchardus spatial distribution geostatistics Iberian Península |
description |
Systematic acoustic surveys to estimate the Spanish fraction of the Atlantic Sardine Stock were begun in 1983. Since 1991, with the use ofthe new Sirnrad EK-500 echosounder-echointegrator, the covered area has been extended to 1000 m isobath to observe the distribution of the main pelagic species in the area. The last three surveys, from spring 1991 to 1993, had a range of 20 to 1000 m isobath. They were first analysed using the traditional methodology proposed in Pastor el al (1986) which do es not give any estimation ofthe variance. Therefore, the data was then analysed using geostatistic techniques, and the resulting relative abundance estimates were compared. Sardine showed high variability between years and zones in both distribution area and density, expressed as number of fish per square nautical mile. The two methods of analysis gave different biomass estimates by zone, especially in 1993. Variograms computed over areas of fish presence did not show, in general, a clear spatial structure and sills were reached at 3 n.m. of range. The precision ofthese variograms was low, ranging from 23% to 40 %, expressed as relative standard error. In order to improve precision it seems necessary to increase the sampling intensity and change the survey grid. For sardine, a systematic parallel with random start survey design, with 6 n.m. between transects, would be more appropriate. |
format |
Article in Journal/Newspaper |
author |
Porteiro-Lago, Carmen Carrera, Pablo Miquel-Batle, Joan |
author_facet |
Porteiro-Lago, Carmen Carrera, Pablo Miquel-Batle, Joan |
author_sort |
Porteiro-Lago, Carmen |
title |
Analysis of Spanish acoustic surveys for sardine, 1991–1993: abundance estimates and inter-annual variability |
title_short |
Analysis of Spanish acoustic surveys for sardine, 1991–1993: abundance estimates and inter-annual variability |
title_full |
Analysis of Spanish acoustic surveys for sardine, 1991–1993: abundance estimates and inter-annual variability |
title_fullStr |
Analysis of Spanish acoustic surveys for sardine, 1991–1993: abundance estimates and inter-annual variability |
title_full_unstemmed |
Analysis of Spanish acoustic surveys for sardine, 1991–1993: abundance estimates and inter-annual variability |
title_sort |
analysis of spanish acoustic surveys for sardine, 1991–1993: abundance estimates and inter-annual variability |
publisher |
International Council for the Exploration of the Sea (ICES) |
publishDate |
1996 |
url |
http://hdl.handle.net/10508/1629 http://hdl.handle.net/10261/327912 https://doi.org/10.1006/jmsc.1996.0060 |
op_coverage |
Atlantic Ocean Eastern Atlantic Northeast Atlantic Iberian waters |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_relation |
Centro Oceanográfico de Vigo http://icesjms.oxfordjournals.org/content/53/2/429.abstract?sid=dac47477-4e1d-411c-85a7-8d583b11753d Porteiro, C. Carrera, P. Miquel, J. (1996) Analysis of Spanish acoustic surveys for sardine 1991-1993: abundance estimates and inter-annual variability. ICES Journal of Marine Science 53 (2); 429-433 http://hdl.handle.net/10508/1629 http://hdl.handle.net/10261/327912 doi:10.1006/jmsc.1996.0060 |
op_rights |
open |
op_doi |
https://doi.org/10.1006/jmsc.1996.0060 |
container_title |
ICES Journal of Marine Science |
container_volume |
53 |
container_issue |
2 |
container_start_page |
429 |
op_container_end_page |
433 |
_version_ |
1790605151917047808 |