ISUNEPCA0721 UWTV Survey on the Gulf of Cadiz Nephrops Grounds and catch options for 2022 in FU30

This working document details the results of the underwater television survey on the Gulf of Cadiz Nephrops grounds (FU 30) conducted in 2021. The survey is considered multi-disciplinary in nature, collecting UW videos, CTD and dredges information. A total 65 UWTV stations were planned in a randomiz...

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Bibliographic Details
Main Authors: Vila, Yolanda, Burgos, Candelaria
Format: Report
Language:English
Published: 2022
Subjects:
Centro Oceanográfico de Cádiz
Nephrops
FU30
underwater television UWTV surveys
Gulf of Cadiz
stock assessment
Pesquerías
Underwater surveying
Burrows
North Atlantic
Online Access:http://hdl.handle.net/10508/16262
http://hdl.handle.net/10261/324412
Description
Summary:This working document details the results of the underwater television survey on the Gulf of Cadiz Nephrops grounds (FU 30) conducted in 2021. The survey is considered multi-disciplinary in nature, collecting UW videos, CTD and dredges information. A total 65 UWTV stations were planned in a randomized 4 nm isometric grid but only 59 UWTV stations were used in the geo-statistical analysis. The mean burrow density observed in 2021, adjusted for cumulative correction factor, was 0.024 burrows/m². The final krigged abundance estimate was 73 million burrows with a CV of 11.5%. The 2021 abundance estimate was the lowest value recorded in the time series. Catch advised for 2022 in FU30 when the ICES precautionary approach is applied and according to category 3.1.4, was no more than 50 tonnes.

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