Fish investigations in the Barents Sea winter 2018.

This report presents the main results from the surveys in January-March 2018. The surveys were performed with the Norwegian research vessels “Helmer Hanssen” and “Johan Hjort” and Russian research vessel “Fritjof Nansen”. Annual survey reports since 1981 are listed in Appendix 1, and names of scientific participants are given in Appendix 3.publishedVersio

Fish Investigations in the Barents Sea Winter 2019

The Institute of Marine Research (IMR), Bergen, has performed acoustic measurements of demersal fish in the Barents Sea since 1976. Since 1981 a bottom trawl survey has been combined with the acoustic survey. Typical effort of the combined survey has been 10-14 vessel-weeks, and about 350 bottom trawl hauls have been made each year. Most years three vessels have participated from about 1 February to 15 March.publishedVersio

Fish investigations in the Barents Sea winter 2020

This report presents the main results from the surveys in January-March 2020. The surveys were performed with the Norwegian research vessels “Helmer Hanssen” and “Johan Hjort” and the Russian research vessel “Vilnyus”. Annual survey reports since 1981 are listed in Appendix 1, and names of scientific participants are given in Appendix 3.publishedVersio

Fish investigations in the Barents Sea Winter 2022

Annual catch quotas and other regulations of the Barents Sea fisheries are set through negotiations between Norway and Russia. Assessment of the state of the stocks and quota advice are based on survey results and international landings statistics. The results from the demersal fish winter surveys in the Barents Sea are an important source of information for the annual stock assessment.Fish investigations in the Barents Sea Winter 2022publishedVersio

Fish investigations in the Barents Sea winter 2017

This report presents the main results from the surveys in January–March 2017. The surveys were performed with the Norwegian research vessels “Helmer Hanssen” and “G.O. Sars”. Annual survey reports since 1981 are listed in Appendix 1, and names of scientific participants are given in Appendix 3

Fish investigations in the Barents Sea winter 2017

This report presents the main results from the surveys in January–March 2017. The surveys were performed with the Norwegian research vessels “Helmer Hanssen” and “G.O. Sars”. Annual survey reports since 1981 are listed in Appendix 1, and names of scientific participants are given in Appendix 3.publishedVersio

The Identification of Pollutants in the Ob River Near Oil Production Areas

Методом хромато-масс-спектрометрии исследован состав органического вещества вод и донных отложений р. Оби на участке от устья Томи до устья Иртыша. Выявлены нефтяные и биогенные соединения. Установлено, что максимальным содержанием биогенных соединений отличается вода вблизи устья р. Васюган, берущей начало и протекающей по территории распространения торфяных болот. Воды широтного течения р. Оби обогащены типичными для нефтей гопанами, стеранами, секогопанами, хейлантанами, тетрациклическими ароматическими углеводородами, полиметилзамещенными нафталинами и фенантренами, а донные отложения вблизи впадения р. Томи – полициклическими ароматическими углеводородами. Показано, что содержание н-алканов, имеющих двойственную природу, не может служить показателем нефтяного загрязнения водоемов, а состав ароматических углеводородов и циклических изопреноидов позволяет различать источники поступления поллютантовThe composition of organic component of water and bottom sediments of Ob River in the area from the mouth of Tom River to the mouth of Irtysh river was studied by using GCMC. Oil and biogenic compounds were found. The maximum content of biogenic compounds was obtained in water near the Vasyugan River mouth, which is starting and flowing through the area of peat bogs propagation. The latitudinal waters of Ob River are enriched with typical oil compounds, such as hopanes, steranes, secohopanes, cheilanthanes, tetracyclic aromatic hydrocarbons, polymethyl substituted naphthalene and phenanthrene. The bottom sediments near the inflow of Tom River are enriched with polycyclic aromatic hydrocarbons. It was shown, that the occurrence of n-alkanes with dual nature cannot be an indicator of water bodies pollution with crude oil. In addition to this, the composition of aromatic hydrocarbons and cyclic isoprenoids may be used to differentiate the pollutant source

Fish investigations in the Barents Sea Winter 2023

Preface Annual catch quotas and other regulations of the Barents Sea fisheries are set through negotiations between Norway and Russia. Assessment of the state of the stocks and quota advice are given by the International Council for the Exploration of the Sea (ICES). Their work is based on survey results and international landings statistics. The results from the demersal fish winter surveys in the Barents Sea are an important source of information for the annual stock assessment. The development of the survey started in the early 1970s and focused on acoustic measurements of cod and haddock. Since 1981 it has been designed to produce both acoustic and swept area estimates of fish abundance. Some development has taken place since then, both in area coverage and in methodology. The development is described in detail by Jakobsen et al . (1997), Johannesen et al . (2009) and in Appendix 3, and the current survey design and methods for survey index calculation are presented in Appendix 2. The survey manual is available at the internal IMR quality portal here. At present the survey provides the main data input for several ongoing projects at the Institute of Marine Research, Bergen: monitoring abundance of the Barents Sea demersal fish stocks mapping fish distribution in relation to climate and prey abundance monitoring food consumption and growth estimating predation mortality caused by cod This report presents the main results from the surveys in January-March 2023. The surveys were performed with the Norwegian research vessels “Kronprins Haakon” and “Johan Hjort”, and the Russian research vessel “Vilnyus”. Annual survey reports since 1981 are listed in Appendix 5, and names of scientific participants in 2023 are given in Appendix 4.Fish investigations in the Barents Sea Winter 2023publishedVersio

Fish Investigations in the Barents Sea Winter 2019

The Institute of Marine Research (IMR), Bergen, has performed acoustic measurements of demersal fish in the Barents Sea since 1976. Since 1981 a bottom trawl survey has been combined with the acoustic survey. Typical effort of the combined survey has been 10-14 vessel-weeks, and about 350 bottom trawl hauls have been made each year. Most years three vessels have participated from about 1 February to 15 March