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A pesar del gran interés ecológico y económico que tiene el mero (Epinephelus marginatus), y el importante esfuerzo investigador realizado desde los años 90, no se han definido las condiciones para su óptimo engorde en cautividad. En general, las mejores condiciones de cultivo son las que proporcionan un ambiente similar al existente en el medio natural, y en el mero, estas condiciones estarían relacionadas con sus hábitos sedentarios, que al ocupar cuevas en el fondo, le permitiría destinar gran parte de la energía adquirida a crecimiento. Las diferentes condiciones de cultivo ensayadas en este estudio muestran que la presencia de refugios (CR) no mejoró el engorde respecto al cultivo sin refugios (SR), mientras que el grupo cultivado en jaula (JAU) mostró el menor peso medio a lo largo del estudio, con 123,1±67,5 g a los 645 días de edad (DDE), frente a SR y CR, que fueron similares, pero con una mayor dispersión en los peces CR (151,6±42,3 g y 164,7±84,6 g, respectivamente). El aumento del diámetro del refugio (225 DDE) y la retirada de la jaula (400 DDE) mejoraron los parámetros de engorde, aumentando el peso un 62% frente al 29% del periodo previo, y un 47% a 530 DDE respecto al 12% del periodo previo, respectivamente, pero no disminuyó la dispersión. La falta de refugios no perjudicó el engorde respecto a su presencia, mientras que el cultivo en jaula requiere un suministro de alimento mejorado.

El cultivo de Seriola dumerili constituye una opción a la diversificación y crecimiento de la producción de peces marinos, que aprovecharía, además, los sistemas de producción e instalaciones en el mar comúnmente usadas para especies como Sparus aurata. Sin embargo, este crecimiento podría estar amenazado por las patologías especificas e inespecíficas de ambas especies, principalmente las causadas por ectoparásitos. Este estudio muestra, en grupos de dorada (GD), seriola (GS) y dorada y seriola juntas (GDS-GSD), una evolución estable del número de huevos de Zeuxapta seriolae (GS: 35±10, y GDS-GSD: 67±24) y de Sparicotyle chrysophrii (GD: 59±10, y GDS-GSD: 22±4), mientras que los huevos de Neobebedenia melleni colectados en GS (2483±364) y GDS-GSD (3168±474) fueron entre un 15 y 20% más altos que en GD (508±100). No se encontraron diferencias en el hematocrito, glucosa, proteína, colesterol y triglicéridos de cada especie cultivada sola o de forma conjunta durante el estudio, pero los niveles de glucosa plasmática en seriola fueron un 50% más altos, y el colesterol un 30% más bajo que en la dorada. NewSpec

The primary aim of this expedition was to investigate the spatial and temporal distribution, the ecology and physiology, as well as competition of co-occurring gadoid species (Atlantic cod, Polar cod, haddock) in the communities of Arctic and Atlantic influence around Svalbard. We sampled the benthic and pelagic communities (including plankton) on the shallow shelf regions of Svalbard to estimate the effects of climate change on Arctic ecosystems to obtain a picture of the entire system structure and function for a long-term monitoring program of the ‘Atlantification’ of the Svalbard region. We assessed the potential impact of changes in trophic interaction (predator-prey relations) of Atlantic cod (Gadus morhua), Polar cod (Boreogadus saida), haddock (Melanogrammus aeglefinus) and decapod crabs on the productivity and stability of benthic and pelagic communities in Arctic ecosystems, into which their distribution ranges now extend due to ocean warming. In addition to a stock assessment and distribution analysis of gadoid fish and decapod crabs, we aimed to obtain specimens of these species in the Atlantic and polar waters around Svalbard, which were transported alive back to Germany. Laboratory experiments under scenarios of climate change at the Alfred Wegener Institute then provided (and still provide) further insight into capacities for adaptation, performance and interaction of selected species of the Arctic ecosystem around Svalbard. The results will on the one hand be used in an international Norwegian-German project and the pan-Arctic data management system (Piepenburg et al. 2011), on the other hand they will flow into fisheries modelling at the University of Hamburg, the Thuenen Institute and socio-economic modelling approaches that build on the German ocean acidification project BIOACID (www.bioacid.de).

Fish represents one of the most important dietary sources of omega-3 polyunsaturated fatty acids, which are known to be associated with various health benefits. This study aimed to systematically review existing meta-analyses of observational studies exploring the association between fish intake and various health outcomes. A systematic search of electronic databases was conducted to retrieve a total of 63 studies. Evidence was deemed as possible for the association between higher fish intake and decreased risk of the acute coronary syndrome, liver cancer, and depression, and limited for other outcomes (including age-related macular degeneration, Alzheimer's disease, heart failure, all-cause and coronary heart disease mortality, total and ischaemic stroke) due to heterogeneity between results and potential otherwise inexplicable confounding factors. In conclusion, results from epidemiological studies support the mechanistic effects associated with omega-3 fatty acids from high fish consumption, but evidence needs to be further corroborated with more reliable results.

Science communication is becoming increasingly important to connect academia and society, and to counteract fake news among climate change deniers. Online video platforms, such as YouTube, offer great potential for low-threshold communication of scientific knowledge to the general public. In April 2020 a diverse group of researchers from the Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research launched the YouTube channel "Wissenschaft fürs Wohnzimmer" (translated to "Sitting Room Science") to stream scientific talks about climate change and biodiversity every Thursday evening. Here we report on the numbers and diversity of content, viewers, and presenters from 2 years and 100 episodes of weekly livestreams. Presented topics encompass all areas of polar research, social issues related to climate change, and new technologies to deal with the changing world and climate ahead. We show that constant engagement by a group of co-hosts, and presenters from all topics, career stages, and genders enable a continuous growth of views and subscriptions, i.e. impact. After 783 days the channel gained 30,251 views and 828 subscribers and hosted well-known scientists while enabling especially early career researchers to improve their outreach and media skills. We show that interactive and science-related videos, both live and on-demand, within a pleasant atmosphere, can be produced voluntarily while maintaining high quality. We further discuss challenges and possible improvements for the future. Our experiences may help other researchers to conduct meaningful scientific outreach and to push borders of existing formats with the overall aim of developing a better understanding of climate change and our planet.