Marin Observation : From seabed to space - 12 > 16 octobre 2020
      • Le 16/09/2018
      • PROGRAMME OF THE SESSION: "F1 - Sustainable fishing (Part I)"

      • Wednesday 10th October a.m. | Room 1
      • sessions siteweb 286x231 v19.jpg
      • Organised by: Pôle Mer Bretagne Atlantique, Ifremer

        Keywords: research, protection, evolution, monitoring, digital fishing, feamp

        Location: Room 1

        (Session in English)


        The workshop will be dedicated to sustainable fishing with different thematics. Increase knowledge on the state of fish stocks and marine biodiversity is essential to a sustainable management of the fisheries. Professionals, enterprises and researchers work in close collaborations to increase knowledge and understanding of the ecosystems and their evolution regarding climate change and their multiple uses. Illustrations with different on-going projects (national, European) dealing with observation, data collecting, capture and fishing gears selectivity.

        Another issue deals with the increasing needs of the markets for seafood and marine proteins for their safety and dietary properties. Indeed one of the main challenges of the century is to ensure a socially, economically and environmentally sustainable seafood production. Interest in marine proteins naturally rich in valuable nutrients for a healthy diet is continuously growing. Innovative solutions are currently being implemented in Europe to improve the safety and dietary properties of seafood. On the same way the exploitation of the whole biomass (byproducts) is becoming a strategic issue (biorefinery concept).

        National and European projects will be highlighted during the workshop. As a transversal issue, the WS will  also be the opportunity to highlight the increasing place of the digitalisation in the different domains of the fishing sector.




        Animated by PORTAL-SELLIN Rachel and LARNAUD Pascal, Pôle Mer Bretagne Atlantique


        09:00 Introduction


        PART I-1 Detection of organisms and population assessment



        TRENKEL Verena, Ifremer, France

        DNA and sustainable exploitation of marine living resources

        All living organisms have DNA (deoxyribonucleic acid). It contains the building code for the structure and functioning of organisms. While a large part of the DNA is identical for all organisms, certain DNA sequences are species-specific and others trace the family history. Recent scientific advances in measuring biodiversity and estimating species abundance are making use of these characteristics of DNA. In this talk I will present the state of the art, recent results and potential future applications. The use of DNA for supporting sustainable exploitation offers many opportunities but raises also a number of practical, logistic and technical challenges.  



        ROMAGNAN Jean-Baptiste, Ifremer, France

        Imaging for the analysis of plankton

        The presentation starts with a short movie to introduce the plankton to non-specialists, and show nice images of plankton. The planktonic context in the framework of fish biology will be briefly reminded. Then, imaging for the scientific analysis of plankton will be presented: plankton-specific technical issues to address, instruments and analytic methods and tools. I will briefly explain why imaging is now considered a relevant method to analyze plankton regarding current scientific concerns in the marine ecology field. Finally, I will conclude the presentation by a short discussion on the needs and perspectives of development in the field of imaging for plankton.



        VACHEROT Jean-Philippe, Ifremer, France

        LANGOLF-TV survey

        The annual survey (since 2014) Langolf-TV aims at estimating the abundance of Nephrops norvegicus in the Bay of Biscay by counting their burrows using a submarine video camera set up on a sled. It replaced the Langolf trawling survey until 2013. Six scientists work 24h/24h to get video footages on the seafloor. These videos are analyzed onboard by accredited observers who then compare their countings of Nephrops burrows.

        The results of this survey are used, after processing, in the Bay of Biscay Nephrops stock assessment.



        BERGER Laurent, Ifremer, France

        Mapping fish resources using acoustics: a review of latest developments implemented in Ifremer fish stock assessment survey.

        Acoustics has been used for several decades by fishermen and fishery scientists for detecting fish schools and estimating abundance at large scale for exploited fish stocks.

        The technology has moved from single beam, single frequency to multibeam and broadband acoustics allowing for better identification of species and enabling to detect not only fish but also mapping lower trophic levels and physical environment of the fish.

        Based on data acquired during annual stock assessment surveys, illustration on new insights in scattering layer composition of plankton organisms using broadband acoustics will be given, together with seafloor habitat mapping using absolute measurement of seabed backscatter.



        KORNELIUSSEN Rolf J, Institute of Marine Research, Norway

        Use of acoustics in Norway for sustainable fishery

        Sonars and echosounders are widely used for remote sensing of life in the marine environment. Two challenges of reducing the uncertainty of acoustic abundance estimates are detection of fish close to the surface and species identification. Detection of fish from close to the surface and down in the water column can be done with a high-resolution sonar combined with echosounder data. Species identification can be based on multi-frequency or broadband echosounder data or by optical means. We used data from Simrad MS70 scientific sonar combined with EK80 echosounder data and methods of species identification to reduce uncertainty of abundance estimates.








        PART I-2 Various approaches in fishing gears selectivity



        BACH Pascal, IRD, France

        Innovation initiatives to improve selectivity and more in pelagic longline fisheries

        Selectivity is a critical issue for pelagic longline fisheries worldwide having to mitigate negative interactions with the marine megafauna targeted or caught as bycatch kept on board or discarded. This selectivity is driven by many factors from operational fishing operations to the gear itself. Natural bait used to attract targeted fish is a part of the terminal gear impacting selectivity. Moreover, natural bait on some extent is an additional discard for this fishing practice. Artificial bait was identified as a promising innovation as a bycatch mitigation measure in pelagic longline fisheries. Where are we and where are we going on that matter?



        LE GALL Yves, Ifremer, France

        Use of acoustic deterrent devices in pelagic fisheries and in shellfish farms

        The use of acoustic repellents may be and interesting solution to limit interactions with some species of fish or marine mammals in various fishing areas and shellfish farms.

        In order to reduce bycatch of common dolphins in pelagic trawls, several developments and sea-trials have been conducted by integrating appropriate high-frequency equipment on fishing gear. Even if a full efficiency is not observed, the dolphin catch reduction is obvious.

        Regarding the predation of oysters and mussels by sea bream in shellfish farms, low-frequency acoustic deterrents have shown some effectiveness. The main problem remains the habituation of the emitted sounds.



        CORBIERES Christophe or CHARLOT Didier, iXblue, France

        Real-time acoustic fishing selectivity for sustainable practices

        Preservation of underwater environment with sustainable fishing practices requires accurate ecosystem assessment tool to provide more realistic quantitative and qualitative data.

        To reach this goal, iXblue proposes a new generation of “3D MBES” based on steerable symmetrical Mills Cross acoustic array. Configuration of “SeapiX” allows to image water column and sea bottom in both athwart ship and fore-and-aft direction with steering capability, covering 120◦ × 120◦ under ship and describing whole ecosystem.

        By combining high spatial “voxel” resolution and large water Column coverage, statistical processing of new proxy allows to describe the ecosystem in full. It ensures real-time habitat description including seabed classification and biomass species classification.

        SeapiX is deployed onboard 60 modern vessels worldwide, and demonstrates daily its capability to provide relevant biomass discrimination for demersal and pelagic fisheries. It enhances dramatically real time biomass resource management and compliance with fishing regulations.



        LARNAUD Pascal, Ifremer, France

        T90 meshing to improve trawl selectivity

        The focus on fishing gear selectivity, mainly on otter trawls, increased with the landing obligation, defined by the European Commission in the CFP 2013. The T90 configuration, when normal mesh is turned through 90 °, tested for the first time in the middle of the 90s, was tested again recently in Europe. The results obtained with two different T90 devices, in Celtic Sea and in the Western Channel, within the CELSELEC and REJEMCELEC projects, will be summarized. The discussion will include a reflection on the implementation of these devices in terms of management.






        End of the session F1-Part 1

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