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New monitoring technologies to produce ancillary data on Nephrops stock assessment

AuthorsAguzzi, Jacopo ; Company, Joan B. ; Navarro, Joan ; Bahamon, Nixon ; Rotllant, Guiomar ; García, José A. ; Río, Joaquín del; Gomáriz, Spartacus; Masmitja, I.; Fanelli, Emanuela ; Marini, S.; Lordan, Colm; Doyle, Jennifer; Chumbinho, Rogerio
Issue Date2019
PublisherInternational Council for the Exploration of the Sea
CitationReport of the Working Group on Nephrops Surveys (WGNEPS) 5(5.2): 90-91 (2019)
ICES WGNEPS Report 2018 5(5.2): 90-91 (2019)
AbstractCurrent stock assessment based on UWTV surveys counts of Nephrops burrows (and thus inhabiting individuals) based on the peculiar morphological traits of these structures within the substrate. Three major uncertainties have been identified in this methodology: i. burrow occupancy which is currently assumed to be of one individual >17mm carapace length per identifiable burrow system; ii. burrow system size and the “edge effect” which could bias the estimates of effective area surveyed; iii. Burrow identification because other sympatric fish and decapod species construct tunnels with morphology similar to those of Nephrops. It is therefore of relevance to produce data on burrow emergence to validate or improve the assumptions made in the UWTV assessment methodology. New in situ technological applications should be used to monitor burrowing behavior producing data on the following key aspects: i. Burrow persistence related to the death and opportunistic occupation by other species; ii. Burrow emergence rhythms at different time-scales which oblige to perform surveys in specific time windows (tidal, day and seasons); iii. Emergence duration that varies according to the hunger state (predation-scavenging), predator presence (visual contact, odor plumes, noise) and intraspecific interactions (territoriality); and finally, iv. emergence range, identifying how many holes belong to a single animal
DescriptionWorking Group on Nephrops Surveys (WGNEPS), 6-8 November 2018, Lorient, France.-- 2 pages, 2 figures
Publisher version (URL)https://www.ices.dk/sites/pub/Publication%20Reports/Expert%20Group%20Report/EOSG/2018/WGNEPS/WGNEPS%20report%202018.pdf
Appears in Collections:(ICM) Informes y documentos de trabajo
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