The Working Group on Nephrops Surveys (WGNEPS) is the international coordination group for Nephrops underwater television and trawl surveys within ICES. This report summarizes the na-tional contributions on the results of the surveys conducted in 2020 together with time series covering all survey years, problems encountered, data quality checks and technological improve-ments as well as the planning for survey activities for 2021.ICE

Aguzzi, Jacopo

Albiez, Jan

Bahamon, Nixon

Berry, Alan

Calisti, Marcello

Chiarini, Matteo

Chumbinho, Rogerio

Company, Joan B.

Doyle, Jennifer

Fahalazed, A.

Flögel, Sascha

Francescangeli, Marco

García, José A.

Gaughan, Paul

Lordan, Colm

López-Vázquez, Vanesa

Marini, Simone

Martinelli, Michela

Masmitja, I.

Mirimin, Luca

Navarro, Joan

O'Malley, C.

Pfannkuche, Olaf

Rodriguez, Erik

Rune, Godoe Olav

Río, Joaquín del

Stefanni, Sergio

Thomsen, L.

Torkelsen, Terje

Tuck, Ian

Valencia, Javier

Vigo Fernandez, María

Wehde, Henning

Zuazo, Ander

English

4 pages, 4 figuresKnowing the displacement capacity and mobility patterns of fished marine resources is pivotal to  establish  effective  conservation  management  strategies  in  marine  ecosystems.  Accurate  be-havioural information of deep-sea fished ecosystems is necessary, but currently scarce, to estab-lish  the  sizes  and  adequate  locations  of  marine  protected  areas  within  the  framework  of  large  international societal programs (e.g. European Community H2020, as part of the Blue Growth economic strategy). A breakthrough in the autonomous capability of mobile platforms to deliver data on animal behaviour beyond traditional fixed platform capabilities (e.g. cabled observato-ries) is overcoming these limitations. Here, we present useful example of that potential in relation to the implementation of autonomous underwater vehicles (AUVs) and remotely operated vehi-cles (ROVs) as an aid for acoustic long-baseline localization systems for autonomous tracking of Norway lobster (Nephrops norvegicus), one of the key resources exploited in European waters. We reported the outcomes of that monitoring in combination with seafloor moored acoustic receiv-ers to detect and track the movements of 33 tagged individuals at 400 m depth over more than three  months.  We  identified  best  procedures  to  localize  both  the  acoustic  receivers  and  the  tagged-lobsters, based on cutting-edge algorithms designed for off-the-self acoustic tags identi-fication. These procedures represent an important step forward for prolonged, in situ monitoring of deep-sea benthic animal behaviour at meter spatial scales. [...]Peer reviewe

Masmitja, Ivan

Gomáriz, Spartacus

Rotllant, Guiomar

Digital.CSIC

Acoustic tracking of Nephrops norvegicus by net-worked moored hydrophones in a deep-sea no-take re-serve of the North Western Mediterranean Sea

Aristegui-Ezquibela, M. (Mikel)

Aguzzi, J. (Jacopo)

Burgos, C. (Candelaria)

Doyle, J.

Fallon, N. (Niall)

Fifas, S. (Spyros)

Jónasson, J.

Jonsson, P. (Patrik)

Lundy, M. (Mathieu)

Martinelli, M.

McAllister, G.

Medvešek, D.

Naseer, A.

Reeve, C.

Simon, J.

Vacherot, J.P.

Vigo-Fernandez, M.

Vila, Y. (Yolanda)

Weetman, A.

Wieland, K.

Repositorio Institucional Digital del IEO

WORKING GROUP ON NEPHROPS SURVEYS (WGNEPS ; outputs from 2020)

3 pagesThe occupancy assumption “one burrow system, one animal” (Sardà and Aguzzi, 2012) raises a number  of  generic  research  questions  concerning  the  true  occupation  of  burrows  in  many  Nephrops stocks. The burrow system acts as the centre of a strong territorial rhythmic behaviour (Rice and Chapman, 1971; Farmer, 1975) leading the adults’ lobsters to evict subordinates from burrows in a dominance hierarchy framework (Sbragaglia et al., 2017); indeed, two wild adult lobsters are rarely found in the same shelter (Cobb and Wang, 1985). Other studies showed evi-dence that no spatial segregation occurs between juveniles and adults (Maynou and Sardà, 1997) achieving the establishment of adult-juvenile complexes (at least 1 adult and 1 juvenile per bur-row), which become separated as juveniles grow (Tuck et al., 1994). Moreover, Nehprops bur-rows  systems  could  also  be  inhabited  by  other  benthic  crustacean species (e.g. Munida sp.) or may  remain  empty  and  intact  for  an  unknown  period  of  time  after  animals’  death  (Sardà  and  Aguzzi, 2012). These factors still create uncertainties about the true numbers of animals occupy-ing burrow systems, representing an important issue when providing a relative or absolute index for determination of Nephrops’ stock status (i.e. Harvest Rate; Sardà and Aguzzi, 2012). [...

Thomsen, Laurenz

ICES | WGNEPS   2020 | 15   2 Technological developments (ToR d) 2.1 Burrow emergence rhythms of Nephrops norvegicus: UWTV, surveying biases and novel technological sce-narios Aguzzi J., Bahamon N. and O'Malley C., Berry A., Gaughan P., Doyle J., Lordan C., Tuck I.D., Chiarini M., Martinelli M., Marini S., Thomsen L., Flögel S., Albiez J., Torkelsen T., Pfannkuche O., Rune Godo O., Henning W., Lopez-Vasquez V., Zuazo A., Rodriguez E., Valencia J., Calisti M., Stefanni S., Mirimin L., Del Río J.,Francescangeli M., Fahalazed A., Navarro J., Vigo M., Masmitjia I., García J.A., Chumbinho R., Company J.B.  The occupancy assumption “one burrow system, one animal” (Sardà and Aguzzi, 2012) raises a number of generic research questions concerning the true occupation of burrows in many Nephrops stocks. The burrow system acts as the centre of a strong territorial rhythmic behaviour (Rice and Chapman, 1971; Farmer, 1975) leading the adults’ lobsters to evict subordinates from burrows in a dominance hierarchy framework (Sbragaglia et al., 2017); indeed, two wild adult lobsters are rarely found in the same shelter (Cobb and Wang, 1985). Other studies showed evi-dence that no spatial segregation occurs between juveniles and adults (Maynou and Sardà, 1997) achieving the establishment of adult-juvenile complexes (at least 1 adult and 1 juvenile per bur-row), which become separated as juveniles grow (Tuck et al., 1994). Moreover, Nehprops bur-rows systems could also be inhabited by other benthic crustacean species (e.g. Munida sp.) or may remain empty and intact for an unknown period of time after animals’ death (Sardà and Aguzzi, 2012). These factors still create uncertainties about the true numbers of animals occupy-ing burrow systems, representing an important issue when providing a relative or absolute index for determination of Nephrops’ stock status (i.e. Harvest Rate; Sardà and Aguzzi, 2012). For a better tuning of the occupancy assumption “1 burrow system, 1 animal”, an accurate tem-poral description of burrow emergence rhythmicity should be provided. The diel rhythm of bur-row emergence can be subdivided in three different phases (Aguzzi et al., 2003, 2007): full emer-gence, full retraction and door-keeping (i.e. an intermediate period in which individuals wait at the burrow entrance; Sbragaglia et al., 2015). In Aguzzi et al. (submitted) more than three thou-sand video transects reporting densities by depth of full emergence and door-keeping animals and burrow systems collected in past decades around Ireland waters, are analysed. All density data were grouped per depth ranges based on both the available ones and the previous knowl-edges from trawl catch patterns (Aguzzi et al., 2003) as nominal: 15-50, 51-100, 101-160 and 340-570 m. A waveform analysis on UWTV survey data were conducted to describe averaged full emergence and door-keeping behavioural rhythms over the 24-h within the established depth range. Such an analysis indicate that Nephrops full emergence varied from nocturnal toward midday hours with increasing depth of sampling, while door-keeping behaviour coincided with full emergence only on the upper shelf (15-50 m depth) and the shelf-break (101-160 m depth). To further improve the analysis GAM models for emergence and door-keeping behaviours by depth range were developed as well. The statistical model result by GAM revealed an overall pattern of full emergence and door-keeping behaviour similar to that found by the previous waveform analysis. The emergence behaviour is predominantly dusk and dawn-oriented above 50 m, bimodal and tending to be diurnal between 50 and 100 m, temporally diffused between 101 and 160 m, and finally fully diurnal between 340 and 570 m. The door-keeping behaviour is 16 | ICES SCIENTIFIC REPORTS 03:36 | ICES   only temporally defined above 50 m (being nocturnal) and bimodal with a nocturnal increase between 100-160 m. Finally, estimated densities of visible animals engaged in both emergence and door-keeping behaviours (i.e. all individuals) were compared with burrow system counts and derived density estimates, to provide evidence putative biases to the standard stock assess-ment assumption that “1 burrow system is occupied and maintained by one animal” (Leocadio et al., 2018). A temporally integrated chart of all waveform and GAM results shows an average of about 1 visible individual per 10 burrows, at most, suggesting that a high proportion of the population remains cryptic even during periods of peak emergence. In last years, the novel technologies have become increasingly common in fish-stock assessment using video imagery from worldwide cabled observatory networks (Aguzzi et al., 2020; Del-Rio et al., 2020). The novel scenarios allow to collect observations on visible Nephrops individuals as well as their burrows through cabled observatory instrumented fields for ecological monitoring of fishery resources (e.g. OBSEA-www.obsea.es; and SmartBay Observatory-https://www.smart-bay.ie/). Hence, the next steps for fishery-independent assessment calibration should be focused on new advanced imaging packages used on autonomous robotic platforms (e.g. crawlers, AUVs and stand-alone cameras) to tune the fishery-independent assessment equation “1 burrow-1 an-imal”.  References Aguzzi, J., Sardà, F., Abelló, P., Company, J. B., and Rotllant, G. 2003. Diel and seasonal patterns of Nephrops norvegicus (Decapoda: Nephropidae) catchability in the western Mediterranean. Marine Ecology Progress Series, 258: 201–211. http://www.jstor.org/stable/24867045 (Accessed 11 May 2018). Aguzzi, J., Company, J. B., and Sardà, F. 2007. The activity rhythm of berried and unberried females of Nephrops norvegicus (Decapoda, Nephropidae). Crustaceana, 80: 1121–1134. Aguzzi, J., and Sardà, F. 2008. Biological rhythms in the marine environment: The Norway lobster as a case study. Contributions to Science, 3: 493–500. http://publicacions.iec.cat/reposi-tory/pdf/00000050/00000097.pdf. Aguzzi, J., Chatzievangelou, D., Company, J. B., Thomsen, L., Marini, S., Bonofiglio, F., Juanes, F., et al. 2020. The potential of video imagery from worldwide cabled observatory networks to provide infor-mation supporting fish-stock and biodiversity assessment. ICES Journal of Marine Science. https://doi.org/10.1093/icesjms/fsaa169. Atkinson, R. J. A., and Eastman, L. B. 2015. Burrow dwelling in Crustacea. The natural history of the Crus-tacea, 2: 78–117. Cobb, J. S., and Wang, D. 1985. Fisheries Biology of Lobsters and Crayfishes. In: Provenzano A.D. (Ed.) The biology of the Crustacea, 10: 167–247. https://books.google.com/books?hl=it&lr=&id=wU1mOBoer5IC&oi=fnd&pg=PA167&dq=Fishery+bi-ology+of+lobsters+and+crayfish&ots=dXNqAKw61q&sig=qHELI0eDiRZToozZ8p8yA3YzO6Y (Ac-cessed 23 October 2020). Del-Rio, J., Nogueras, M., Toma, D. M., Martínez, E., Artero-Delgado, C., Bghiel, I., Martinez, M., et al. 2020. Obsea: A Decadal Balance for a Cabled Observatory Deployment. IEEE Access, 8: 33163–33177. Farmer, A. S. D. 1975. Synopsis of the biological data on the Norway lobster Nephrops norvegicus (Lin-naeus, 1758). FAO Fisheries Synopsis, 112: 1–97. Leocadio, A., Weetman, A. & Wieland, K. 2018. Using UWTV surveys to assess and advise on Nephrops stocks. ICES Cooperative Research Report No. 340. 49. Maynou, F., and Sardà, F. 1997. Nephrops norvegicus population and morphometrical characteristics in relation to substrate heterogeneity. Fisheries Research, 30: 139–149. Elsevier. Rice, A. L., and Chapman, C. J. 1971. Observations on the burrows and burrowing behaviour of two mud-dwelling decapod crustaceans, Nephrops norvegicus and Goneplax rhomboides. Marine Biology: ICES | WGNEPS   2020 | 17   International Journal on Life in Oceans and Coastal Waters, 10: 330–342. http://link.springer.com/10.1007/BF00368093 (Accessed 8 June 2018). Sardà, F., and Aguzzi, J. 2012. A review of burrow counting as an alternative to other typical methods of assessment of Norway lobster populations. Reviews in Fish Biology and Fisheries, 22: 409–422. http://link.springer.com/10.1007/s11160-011-9242-6 (Accessed 11 May 2018). Sbragaglia, V., Aguzzi, J., Garcı́a, J. A., Sarriá, D., Gomariz, S., Costa, C., Menesatti, P., et al. 2013. An auto-mated multi-flume actograph for the study behvioural rhythms of burrowing organisms. J. Exp. Mar. Biol. Ecol., 446: 177–185. Sbragaglia, V., García, J. A., Chiesa, J. J., and Aguzzi, J. 2015. Effect of simulated tidal currents on the burrow emergence rhythms of the Norway lobster (Nephrops norvegicus). Marine Biology, 162: 2007–2016. Springer Berlin Heidelberg. Sbragaglia, V., Leiva, D., Arias, A., Antonio García, J., Aguzzi, J., and Breithaupt, T. 2017. Fighting over burrows: the emergence of dominance hierarchies in the Norway lobster (Nephrops norvegicus). The Journal of Experimental Biology, 220: 4624–4633. http://jeb.biolo-gists.org/lookup/doi/10.1242/jeb.165969. Tuck, I. D., Atkinson, R. J. A., and Chapman, C. J. 1994. The structure and seasonal variability in the spatial distribution of Nephrops norvegicus burrows. Ophelia, 40.  2.2 Creel fishing and acoustic tracking trials in the No-Take zone off Palamós-Roses (Northwestern Mediterranean Sea) at 350-420 m depth. Maria Vigo, Joan Navarro, José A. García, Jacopo Aguzzi, Guiomar Rotllant , Nixon Bahamón and Joan B. Company Marine Protected Areas (MPAs) have proven to be useful tools for conservation (Day et al., 2019), and they can offer many other benefits such as improving commercial fish stocks, including hab-itat restoration (Kerwath et al., 2013; Langton et al., 2020). In the context of the Spanish research project called RESNEP (CTM2017-82991-C2-1-R, “Marine no-take areas as a tool to recover iconic Mediterranean fisheries in decline: the case of Nephrops norvegicus”), a pilot marine reserve was established in an overfished ground at 350-400 m depth in the NW Mediterranean Sea, where Norway lobster (Nephrops norvegicus) dominated the target species fished by local and regional fisheries (BOE-A-2020-9015). Norway lobster constitutes an iconic fishing resource for European fisheries (Leocádio et al., 2012), whose landings have diminished the last two decades, especially in deep-water overfished benthic Mediterranean ecosystems (García-De-Vinuesa et al., 2020; Piroddi et al., 2020). The main objective of this marine no-take reserve, stablished on 2017, was to recover the population of Norway lobster as well as the recovery of the benthic assemblage and the habitat state.  

Burrow emergence rhythms of Nephrops norvegicus: UWTV, surveying biases and novel technological scenarios

114 pages, figures, tables, 5 annexesThe Working Group on NephropsSurveys (WGNEPS) is the international coordination group for Nephrops underwater television and trawl surveys within ICES. This report summarizes the na-tional  contributions  on  the  results  of  the  surveys  conducted  in  2020  together  with  time  series  covering all survey years, problems encountered, data quality checks and technological improve-ments as well as the planning for survey activities for 2021. [...

Aristegui-Ezquibela, Miquel

Burgos, Candelaria

Fallon, Niall

Fifas, Spyros

Jónasson, Jónas

Jonsson, Patrik

Lundy, Mathieu

McAllister, Gerald

Medvešek, Damir

Naseer, Atif

Reeve, Charlotte

Silva, Cristina

Simon, Julien

Vacherot, Jean-Philippe

Vila, Yolanda

Weetman, Adrian

Wieland, Kai

Working Group on Nephrops Surveys (WGNEPS outputs from 2020)

The Working Group on Nephrops Surveys (WGNEPS) is the international coordination group for Nephrops underwater television and trawl surveys within ICES. This report summarizes the national contributions on the results of the surveys conducted in 2020 together with time series covering all survey years, problems encountered, data quality checks and technological improvements as well as the planning for survey activities for 2021.In total, 19 surveys covering 25 functional units (FU’s) in the ICES area and 1 geographical subarea (GSA) in the Adriatic Sea were discussed and further improvements in respect to survey design and data analysis standardization and the use of most recent technology were reviewed. Due to the COVID-19 pandemic there were disruptions across several functional units to: survey operations (FU 30, GSA 17, FU 10, FU 13 – Jura, FU 34, FU 28-29); data processing (FU 23-24) and survey coverage (FU 9).Further results from field studies on behaviour aspects of burrow emergence using bottom cages monitored by an automated camera system and on short-range migration using acoustic tracking and remote operated vehicle (ROV) surveys in marine protected areas have become available and are summarised in this report.Geostatistical investigations to reduce uncertainty estimates showed comparable results to historical trends for one survey area in the North Sea. Other preliminary work to redefine survey area using best available datasets was also discussed. Reference sets compilation and count evaluations using still image annotations and Lin’s concordance correlation coefficient (CCC) quality control were presented. Automatic burrow detection based on deep learning methods applied to a test dataset with annotated burrow counts from a HD camera system from two projects showed promising results. The working group members were encouraged to provide more material with annotated burrow counts for further development of machine learning tools.An underwater television (UWTV) survey manual has been accepted for publication in the ICES Techniques in Marine Environmental Sciences (TIMES) series. The working group is currently developing plans for a Nephrops UWTW database to be established at the ICES data centre

Aristegui-Ezquibela, Mikel

Vigo-Fernandez, Maria

Online Research Database In Technology

Working Group on Nephrops Surveys (WGNEPS ; outputs from 2020)

5 pages, 5 figuresMarine Protected Areas (MPAs) have proven to be useful tools for conservation (Day et al., 2019), and they can offer many other benefits such as improving commercial fish stocks, including hab-itat restoration (Kerwath et al., 2013; Langton et al., 2020). In the context of the Spanish research project called RESNEP (CTM2017-82991-C2-1-R, “Marine no-take areas as a tool to recover iconic Mediterranean fisheries in decline: the case of Nephropsnorvegicus”), a pilot marine reserve was established  in  an  overfished  ground  at  350-400 m depth in the NW Mediterranean Sea, where Norway lobster (Nephrops norvegicus) dominated the target species fished by local and regional fisheries (BOE-A-2020-9015). Norway lobster constitutes an iconic fishing resource for European fisheries (Leocádio et al., 2012), whose landings have diminished the last two decades, especially in deep-water  overfished  benthic  Mediterranean  ecosystems (García-De-Vinuesa  et  al.,  2020; Piroddi et al., 2020). The main objective of this marine no-take reserve, stablished on 2017, was to recover the population of Norway lobster as well as the recovery of the benthic assemblage and the habitat state. [...]Peer reviewe

Creel fishing and acoustic tracking trials in the No-Take zone off Palamós-Roses (Northwestern Mediterranean Sea) at 350-420 m depth

http://www.repositorio.ieo.es/e-ieo/bitstream/10508/12383/1/WGNEPS%20Report%202020.pdf

WORKING GROUP ON NEPHROPS SURVEYS (WGNEPS ; outputs from 2020)

Abstract

Similar works

Full text

Available Versions

Digital.CSIC

Repositorio Institucional Digital del IEO

Digital.CSIC

Digital.CSIC

Online Research Database In Technology

Digital.CSIC