Catch efficiency of trawl nets used in surveys of the yellow squat lobster (<i>Cervimunida johni</i>) estimated by underwater filming records

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dc.contributor.authorAhumada, Mauricio
dc.contributor.authorQueirolo, Dante
dc.contributor.authorApablaza, Pedro
dc.contributor.authorWiff, Rodrigo
dc.contributor.authorFlores, Andres
dc.date.accessioned2025-01-20T22:17:17Z
dc.date.available2025-01-20T22:17:17Z
dc.date.issued2021
dc.description.abstractCatch efficiency is an important index to relate observed density to the size of a population in the context of bottom trawl surveys. The estimation of catch efficiency is challenging because it involves independent measures of animals in the path of the bottom trawl. We estimated catch efficiency using an underwater camera system on three trawl fishing vessels used for estimating the density of the yellow squat lobster (Cervimunida johni) off central Chile. During 2015 and 2018, 54 hauls were analyzed, and a total of 20 h of filming were recorded. A total of 4,155 yellow squat lobster individuals were analyzed approaching the net in the path of the trawl, of which 2,330 (56%) were captured and 1,825 escaped underneath the groundrope. The median estimated ranges of catch efficiency varied between 0.81-0.90 for vessel 1, 0.15-0.72 for vessel 2 and 0-0.58 for vessel 3. According to a hierarchical generalized linear model (HGML), fishing vessels and mean depth of hauls showed significant differences in catch efficiency (p<0.05). The results were comparable with estimates available for other crustacean species, and differences among vessels can be associated with differences in rigging configurations. Discussion was focused on the processes affecting catch efficiency and how differential catchability among sampling vessels may bias the construction of spatially explicit density maps and further abundance estimates of yellow squat lobsters in Chile. (C) 2021 Elsevier B.V. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.rsma.2021.101744
dc.identifier.issn2352-4855
dc.identifier.urihttps://doi.org/10.1016/j.rsma.2021.101744
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94544
dc.identifier.wosidWOS:000663075900004
dc.language.isoen
dc.revistaRegional studies in marine science
dc.rightsacceso restringido
dc.subjectCervimunida johni
dc.subjectYellow squat lobster
dc.subjectBottom trawl
dc.subjectUnderwater video
dc.subjectCatch efficiency
dc.subjectCatchability
dc.subject.ods14 Life Below Water
dc.subject.ods15 Life on Land
dc.subject.odspa14 Vida submarina
dc.subject.odspa15 Vida de ecosistemas terrestres
dc.titleCatch efficiency of trawl nets used in surveys of the yellow squat lobster (<i>Cervimunida johni</i>) estimated by underwater filming records
dc.typeartículo
dc.volumen44
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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