The comeback of Atlantic bluefin tuna (Thunnus thynnus) to Norwegian waters

We document that Atlantic bluefin tuna (BFT) began making a comeback from 2012 onwards into Norwegian waters, after several decades of absence, in parallel with an overall increased abundance recorded for eastern BFT. This study explores the distribution, biology and ecology of BFT reestablishing in Norwegian waters. We analyzed commercial catch and bycatch data including biological data on weight, length and age of BFT from 2016–2018. Predominantly larger (overall range in catches: 120−465 kg in weight and 184−297 cm in straight fork length (SFL)) adult individuals between 6 and 14 years old have recently started to revisit Norwegian waters. Numerous recently documented BFT observations were reported in this study, and a significant increase was detected from 2012 (n = 1) to 2018 (n = 105) (p < 0.01). Schools of BFT were observed predominantly from June to December, including the northernmost registered observation in history recorded at 76.2 °N in September 2018. Atlantic bluefin tuna has now reestablished and has shown a positive comeback to its historical migration patterns in Norwegian waters, where it has expanded its feeding areas towards the north.publishedVersio

Varmere havområders påvirkning på fiskebestander

Invitert foredrag fra Fiskeridirektoratet 4. februar 201

Horizontal distribution and overlap of planktivorous fish stocks in the Norwegian Sea during summers 1995–2006

The Norwegian Sea harbours several large pelagic fish stocks, which use the area for feeding during the summer. The period 1995–2006 had some of the highest biomass of pelagic fish feeding in the Norwegian Sea on record. Here we address the horizontal distribution and overlap between herring, blue whiting and mackerel in this period during the summers using a combination of acoustic, trawl and LIDAR data. A newly developed temperature atlas for the Norwegian Sea is used to present the horizontal fish distributions in relation to temperature. The centre of gravity of the herring distribution changed markedly several times during the investigated period. Blue whiting feeding habitat expanded in a northwestern direction until 2003, corresponding with an increase in abundance. Strong year classes of mackerel in 2001 and 2002 and increasing temperatures throughout the period resulted in an increased amount of mackerel in the Norwegian Sea. Mackerel was generally found in waters warmer than 8°C, while herring and blue whiting were mainly found in water masses between 2 and 8°C. The horizontal overlap between herring and mackerel was low, while blue whiting had a large horizontal overlap with both herring and mackerel. The changes in horizontal distribution and overlap between the species are explained by increasing stock sizes, increasing water temperature and spatially changing zooplankton densities in the Norwegian Sea

Perceived humiliation during admission to a psychiatric emergency service and its relation to socio-demography and psychopathology

Background There is a lack of empirical studies of patients’ level of humiliation during the hospital admission process and its implications for the clinical setting. We wanted to explore associations between self-rated humiliation and socio-demography and psychopathology in relation to admission to a psychiatric emergency unit. Methods Consecutively admitted patients (N = 186) were interviewed with several validated instruments. The patients self-rated humiliation by The Cantril Ladder, and 35% of the sample was defined as the high humiliation group. Results Final multivariate analysis found significant associations between compulsory admission, not being in paid work, high scores on hostility, and on entitlement, and high levels of humiliation. No significant interactions were observed between these variables, and the narcissism score was not a confounder concerning humiliation. Conclusions High level of humiliation during the admission process was mainly related to patient factors, but also to compulsory admission which should be avoided as much as possible protecting the self-esteem of the patients