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IMR-PINRO Joint Report Series No. 4-2010 (PDF) IMR/PINRO J O 4 S I E N I T 2010 R E R E S P O R T Survey Report from the joint Norwegian-Russian Ecosystem Survey in the Barents Sea August - September 2010 Institute of Marine Research - IMR Polar Research Institute of Marine Fisheries and Oceanography - PINRO This report should be cited as: Anon. 2010. Survey report from the joint Norwegian/Russian ecosystem survey in the Barents Sea August-September 2010. IMR/PINRO Joint Report Series, No. 4/2010. ISSN 1502-8828. 108 pp. ECOSYSTEM SURVEY OF THE BARENTS SEA AUTUMN 2010 SURVEY REPORT FROM THE JOINT NORWEGIAN/RUSSIAN ECOSYSTEM SURVEY IN THE BARENTS SEA AUGUST – SEPTEMBER 2010 Preface The 7-th joint survey was carried out during the period 09th of August to 26th of September 2010. The survey plans and tasks were agreed in the annual IMR-PINRO meeting in March 2010 and all joint work was executed according to this plan. The effort allocated to demersal fish investigation was reduced by 12 % compared to previous years. Other investigations were kept at the same level as in previous years. Consequently, a joint, but somewhat reduced “ecosystem survey” was carried out by IMR and PINRO also in 2010. The content of this report covers many but not all aspects of the survey. The content will be updated and available in electronic form in the Internet (www.imr.no). “Potato deck”. Photo: Dmitry Prozorkevich 3 ECOSYSTEM SURVEY OF THE BARENTS SEA AUTUMN 2010 This report was prepared in Svanhovd, Finmark, Norway 27-30 September and by correspondence, and the following has contributed: Alexander Trofimov Oceanography Bente Røttingen Pelagic fish stocks estimation, data analyses, map preparation Bjarte Bogstad Capelin stock analyses and prognosis (AFWG chairman) Dmitry Prozorkevich 0-group, pelagic fish (survey coordinator) Elena Eriksen 0-group indices calculation and map preparation Harald Gjøsæter Pelagic fish analyses, methods and descriptions (main editor) Jaime Alvarez Pelagic fish stock estimation, data analyses, map preparation Pavel Murashko Demersal fish data analyses Randi Ingvaldsen Oceanography, pollution (survey and meeting coordinator) Sigurd Tjelmeland Capelin stock analyses and prognosis Tatyana Prokhorova Sampling information, data fitness checking, fish health Tor Knutsen Zooplankton Padmini Dalpadado Zooplankton Emma Orlova Zooplankton Lars-Johan Naustvoll Phytoplankton Vladimir Zabavnikov Russian seabird and marine mammals Mette Skern-Mauritzen Seabirds and marine mammals Lis L. Jørgensen Benthos Pavel Lubin Benthos Hilde Elise Heldal Pollution The scientist and technicians taking part onboard the research vessels and executing an enormous work for data collection are listed below: Alexander Benzik, Alexander Pronuk, Alexandr Urko, Alexey Amelkin, Alexey Semenov, Alexey Astakhov, Andrey Sokolov, Anna Søderlind, Anne Sæverud, Anne- Christine Knag, Anne-Liv Johnsen, Arve Lynghammar, Bente Skjold, Bjarte Kvinge, Bjørn Vidar Svendsen, Bjørnar Ellertsen, Denis Zakharov, Eilert Hermansen, Eli Gustad, Else Holm, Eirik Grønningsæter, Gayantonia Franze, Gunnar Bakke, Gunnar Lien, Gunnar Richardsen, Halvard Larsen, Helga Gill, Hildegunn Mjanger, Ilja Dolgolenko, Iljas Shafikov, Inger Henriksen, Jan Frode Wilhelmsen, Jan Henrik Nilsen, Janicke Skadal, Jarle Kristiansen, Jarle Vedholm, Jon Rønning, Jostein Røttingen, Johanne Fall, Julio Erices, Karl-Erik Karlsen, Lage Drivenes, Laura Rey, Magnar Mjanger, Magnus Johannessen, Maxim Gubanischev, Merete Kvalsund, Mikhail Nosov, Nadezhda Ibragimova, Natalia Zhuravleva, Ole Dyping, Ole Oskar Arnøy, Ole Sverre Fossheim, Olesja Urko, Pavel Krivosheya, Olga Zimina, Pavel Lubin, Penny Lee Liebig, Peter Lawentry, Ronald Pedersen, Sergey Karlin, Silje Seim, Stuart Murray, Tatiana Gavrilik, Terje Haugland, Thomas de Lange Wenneck, Thomas Sivertsen, Tommy Sivertsen, Tor Knutsen, Valentine Anthonypillai, Valery Ignashkin, Veronika Vyaznikova, Viktor Ivshin, Yasmin Hunt Special thanks to: Crew of research vessels Johan Hjort, Vilnyus, G.O.Sars, Fridtjof Nansen and Jan Mayen for ensuring the investigation and good work. 4 ECOSYSTEM SURVEY OF THE BARENTS SEA AUTUMN 2010 5 ECOSYSTEM SURVEY OF THE BARENTS SEA AUTUMN 2010 Synopsis The main aim of the ecosystem survey was to collect data about distribution and abundance of all sea organisms on different stages of their life’s for estimation, including pelagic and demersal fish species, zooplankton, benthos, seabirds and mammals. An important task was also to collect information about sea environment, pollution etc. The water temperature below surface in most of the observed areas was somewhat lower than in the same period in 2009 but still higher (0.3-0.9 °C) than the long term mean. The 2010 year-classes of cod and saithe are rich. 0-group of capelin, haddock, redfish and polar cod are near the average level. 0-group of herring and long rough dab were estimated as poor. The year-class of Greenland halibut is uncertain but possibly also poor. The total capelin stock was estimated at 3.49 million tonnes, which is 7% lower than last year. About 2.0 million tonnes were assumed to be maturing. Estimated maturing stock is 13% below the last year’s estimate but above the long term mean level. The polar cod stock was estimated to be 1.43 million tonnes, which is 36% higher than in 2009 and above the long term mean level. The number of juvenile Norwegian spring spawning herring in the Barents Sea has decreased considerably and was estimated to be 1.8 billion individuals. Spring spawning herring was not found in the south-eastern part. Blue whiting of age groups 3 to 13, but mostly age 5 - 6, were observed in the western part of the surveyed area. The biomass of this stock component was estimated to be 0.18 million tonnes, which is lower than in 2009. Investigations in the area adjacent to the sunken nuclear submarine “Komsomolets” do not indicate a significant leakage from the submarine. Numbers of Red King Crab in the survey area are considerably reduced. Numbers of Snow crab are also reduced. The benthos biomass distribution in 2010 was generally the same as in previous years. Numbers of observed marine mammals increased by a factor of 4 relative to 2009. At least part of this increase is likely due to very good observation conditions during the survey. Many baleen whales were observed in association with capelin and polar cod concentrations. The marine mammals were mainly observed within their traditional distribution areas, except for white-beaked dolphins were only few observations were made in the southern and eastern Barents Sea. The level of fish pathologies is not much (0.18 %) and it was lower than in 2009 (0.7 %). The man-made pollution of the Barents Sea by garbage on surface and on bottom is quite significant. 6 ECOSYSTEM SURVEY OF THE BARENTS SEA AUTUMN 2010 CONTENT 1 METHODS ............................................................................................................................ 9 1.1 HYDROGRAPHY............................................................................................................. 9 1.2 0 GROUP FISH INVESTIGATIONS...................................................................................... 9 1.3 ACOUSTIC SURVEY FOR PELAGIC FISH ......................................................................... 10 1.3.1 Area coverage................................................................................................... 10 1.3.2 Computations of the stock sizes ........................................................................ 11 1.4 BOTTOM TRAWL SURVEY ............................................................................................ 11 1.4.1 Strata system used............................................................................................. 11 1.5 PLANKTON INVESTIGATIONS ....................................................................................... 11 1.6 STOMACH INVESTIGATIONS......................................................................................... 13 1.7 MARINE MAMMALS AND SEABIRDS INVESTIGATIONS .................................................. 13 1.8 BENTHOS OBSERVATIONS............................................................................................ 13 1.9 POLLUTION.................................................................................................................. 14 1.10 FISH PATHOLOGY RESEARCH .................................................................................. 14 2 RESULTS AND DISCUSSION.......................................................................................... 15 2.1 HYDROGRAPHICAL CONDITIONS.................................................................................. 15 2.2 DISTRIBUTION AND ABUNDANCE OF 0-GROUP FISH ..................................................... 16 2.2.1 Capelin (Mallotus villosus)............................................................................... 17 2.2.2 Cod (Gadus morhua) ........................................................................................ 17 2.2.3 Haddock (Melanogrammus aeglefinus)............................................................ 17 2.2.4 Herring (Clupea harengus) .............................................................................. 18 2.2.5 Polar cod (Boreogadus saida).......................................................................... 18 2.2.6 Saithe (Pollachius virens)................................................................................. 19 2.2.7 Redfish (Sebastes sp.) ......................................................................................
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