scholarly journals Assessment of golden redfish (Sebastes marinus L) in Icelandic waters

2003 ◽  
Vol 67 (S1) ◽  
pp. 301-314 ◽  
Author(s):  
Höskuldur Björnsson ◽  
Thorsteinn Sigurdsson
Keyword(s):  
Icelandic Waters

Acoustically invisible feeding blue whales in Northern Icelandic waters

2014 ◽  
Vol 136 (2) ◽  
pp. 939-944 ◽  
Author(s):  
Tomonari Akamatsu ◽  
Marianne Helene Rasmussen ◽  
Maria Iversen
Keyword(s):  
Blue Whales ◽  
Icelandic Waters

scholarly journals Isolation, Characterization and Biotechnological Potentials of Thraustochytrids from Icelandic Waters

Marine Drugs ◽  
2019 ◽  
Vol 17 (8) ◽  
pp. 449 ◽  
Author(s):  
Magnús Örn Stefánsson ◽  
Sigurður Baldursson ◽  
Kristinn P. Magnússon ◽  
Arnheiður Eyþórsdóttir ◽  
Hjörleifur Einarsson
Keyword(s):  
Biodiesel Production ◽  
Human Consumption ◽  
Northern Coast ◽  
Omega 3 ◽  
Marine Oils ◽  
Media Formulation ◽  
Omega 6 ◽  
First Time ◽  
18S Rdna Sequence ◽  
Icelandic Waters

The following study reports on the first thraustochytrid isolates identified from Iceland. They were collected from three different locations off the northern coast of the country (Location A, Skagaströnd; Location B, Hveravík; and Location C, Eyjafjörður). Using 18S rDNA sequence analysis, isolates from Locations A and B were identified within the Thraustochytrium kinnei species while other isolates within the Sicyoidochytrium minutum species when compared to other known strains. Cells isolated from Locations A ( 2 . 10 ± 0 . 70 g/L) and B ( 1 . 54 ± 0 . 17 g/L) produced more biomass than the ones isolated from Location C ( 0 . 43 ± 0 . 02 g/L). This study offers the first-time examination of the utility of byproducts from fisheries as a nitrogen source in media formulation for thraustochytrids. Experiments showed that isolates produced more biomass (per unit of substrate) when cultured on nitrogen of marine ( 2 . 55 ± 0 . 74 g/L) as compared to of commercial origin (  1 . 06 ± 0 . 57 g/L). Glycerol ( 2 . 43 ± 0 . 56 g/L) was a better carbon source than glucose ( 1 . 84 ± 0 . 57 g/L) in growth studies. Fatty acid (FA) profiles showed that the isolates from Location C (S. minutum) had low ratios of monounsaturated ( 4 . 21 ± 2 . 96 % ) and omega-6 ( 0 . 68 ± 0 . 59 % ) FAs. However, the isolates also had high ratios of docosahexaenoic acid (DHA; 35 . 65 ± 1 . 73 % ) and total omega-3 FAs ( 40 . 39 ± 2 . 39 % ), indicating that they could serve as a source of marine oils for human consumption and in aquaculture feeds. The T. kinnei isolates from Location A could be used in biodiesel production due to their high ratios of monounsaturated ( 18 . 38 ± 6 . 27 % ) long chain ( 57 . 43 ± 8 . 27 % ) FAs.

scholarly journals Risk Assessment for Key Socio-Economic and Ecological Species in a Sub-Arctic Marine Ecosystem Under Combined Ocean Acidification and Warming

Ecosystems ◽  
2021 ◽  
Author(s):  
Maartje Oostdijk ◽  
Erla Sturludóttir ◽  
Maria J. Santos
Keyword(s):  
Ocean Acidification ◽  
Atlantic Cod ◽  
Marine Ecosystem ◽  
Keystone Species ◽  
Ecosystem Model ◽  
The Arctic ◽  
Predatory Fish ◽  
Important Species ◽  
Cascading Effects ◽  
Icelandic Waters

AbstractThe Arctic may be particularly vulnerable to the consequences of both ocean acidification (OA) and global warming, given the faster pace of these processes in comparison with global average speeds. Here, we use the Atlantis ecosystem model to assess how the trophic network of marine fishes and invertebrates in the Icelandic waters is responding to the combined pressures of OA and warming. We develop an approach where we first identify species by their economic (catch value), social (number of participants in fisheries), or ecological (keystone species) importance. We then use literature-determined ranges of sensitivity to OA and warming for different species and functional groups in the Icelandic waters to parametrize model runs for different scenarios of warming and OA. We found divergent species responses to warming and acidification levels; (mainly) planktonic groups and forage fish benefited while (mainly) benthic groups and predatory fish decreased under warming and acidification scenarios. Assuming conservative harvest rates for the largest catch-value species, Atlantic cod, we see that the population is projected to remain stable under even the harshest acidification and warming scenario. Further, for the scenarios where the model projects reductions in biomass of Atlantic cod, other species in the ecosystem increase, likely due to a reduction in competition and predation. These results highlight the interdependencies of multiple global change drivers and their cascading effects on trophic organization, and the continued high abundance of an important species from a socio-economic perspective in the Icelandic fisheries.

Drivers of growth for Atlantic cod ( Gadus morhua L.) in Icelandic waters – A Bayesian approach to determine spatiotemporal variation and its causes

2019 ◽  
Vol 95 (2) ◽  
pp. 401-410 ◽  
Author(s):  
Paul N. Frater ◽  
Birgir Hrafnkelsson ◽  
Bjarki Th. Elvarsson ◽  
Gunnar Stefansson
Keyword(s):  
Bayesian Approach ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Spatiotemporal Variation ◽  
Icelandic Waters

scholarly journals Preface—biodiversity of Icelandic waters

2018 ◽  
Vol 48 (2) ◽  
pp. 715-718
Author(s):  
Karin Meißner ◽  
Saskia Brix ◽  
Kenneth M. Halanych ◽  
Anna M. Jażdżewska
Keyword(s):  
Icelandic Waters

scholarly journals Contribution of different spawning components to the mixed stock fishery for cod in Icelandic waters

2007 ◽  
Vol 64 (9) ◽  
pp. 1749-1759 ◽  
Author(s):  
Ingibjörg G. Jónsdóttir ◽  
Gudrun Marteinsdottir ◽  
Steven E. Campana
Keyword(s):  
Maximum Likelihood ◽  
Gadus Morhua ◽  
Fish Length ◽  
Minor Importance ◽  
Otolith Chemistry ◽  
Marine Science ◽  
Otolith Shape ◽  
Mixed Stock ◽  
Feeding Grounds ◽  
Icelandic Waters

Abstract Jónsdóttir, I. G., Marteinsdottir, G., and Campana, S. E. 2007. Contribution of different spawning components to the mixed stock fishery for cod in Icelandic waters. – ICES Journal of Marine Science, 64: 000–000. Otolith chemistry and length-at-age were used to estimate the contribution of different spawning components to the harvested stock of cod (Gadus morhua) at two of their main feeding grounds northwest and east of Iceland. Spawning cod were sampled at different spawning locations around Iceland in spring of 2002 and 2003. Significant differences were detected between cod from the different spawning locations. Cod of unknown stock origin were also sampled at two of the main feeding grounds in October of the same years. Analyses based on maximum likelihood were used to estimate the proportion of each spawning group in the mixed stock catches using otolith chemistry and fish length-at-age. Attempts to use otolith shape to estimate the contribution of the spawning groups to the mixed harvested stock were, however, unsuccessful. The results indicated that spawning locations northwest and north of Iceland, as well as in water deeper than 125 m south of Iceland, contributed the most to the harvested stock. Cod spawning shallower than 125 m south of Iceland did not contribute to the feeding grounds in October of 2002 and 2003. Therefore, exploitation of the feeding stock mixtures seems to be based on spawning components that have previously been considered to be of minor importance to the Icelandic cod stock.

scholarly journals Spatial distribution of otter trawl effort in Icelandic waters: comparison of measures of effort and implications for benthic community effects of trawling activities

2003 ◽  
Vol 60 (6) ◽  
pp. 1200-1215 ◽  
Author(s):  
Stefán Áki Ragnarsson ◽  
Sigmar Arnar Steingrímsson
Keyword(s):  
Spatial Distribution ◽  
Scale Effects ◽  
Benthic Communities ◽  
Demersal Fish ◽  
Fishing Effort ◽  
Otter Trawl ◽  
Community Effects ◽  
The North ◽  
Swept Area ◽  
Icelandic Waters

Abstract We examined the spatial distribution of trawling effort from logbook data from all Icelandic vessels fishing for demersal fish between 1991 and 1997 with a spatial resolution of 1 degree of latitude and 1 degree of longitude. The trawling effort was widely distributed but was intensive only in small and localised areas. Three measures of effort were compared; tow frequency, tow duration and separate estimates of swept area for otter boards and trawls. In each year, the area swept with otter trawl was 1.7 times greater than the total area in which fishing occurred over the 7 year period. In contrast, the area swept with otter boards was 4% of the total fishing area. Most of the fishing effort was confined to depths shallower than 400 m. With increasing depth, the size of trawls became larger and accordingly, also the area swept per haul. Calculations assuming no variation in the size of the trawl in relation to depth, produced inaccurate swept area estimates. Furthermore, swept area estimates based on depth corrected door spreads were greater than estimates where no such correction was made. Swept area was considered to be a more appropriate measure of effort than tow frequency and tow duration as long as variation in the size of the gear (e.g. in relation to depth) was taken into account. Effort within Icelandic waters was compared in five depth strata within seven zones. Effort was highest off the south and NW coasts and lowest off the north and east coasts. Effort was most intensive at the 100–500 m depth in all zones but in some areas (such as off NW Iceland), effort extended to deeper waters. Knowledge of the distribution of fishing effort is important for predicting larger scale effects of fishing gears on benthic communities.

Taxonomy and distribution of Terebellides (Polychaeta, Trichobranchidae) in Icelandic waters, with the description of a new species

Zootaxa ◽  
2011 ◽  
Vol 2983 (1) ◽  
pp. 1 ◽  
Author(s):  
JULIO PARAPAR ◽  
JUAN MOREIRA ◽  
GUDMUNDUR V. HELGASON
Keyword(s):  
New Species ◽  
Taxonomic Revision ◽  
Original Description ◽  
Phylogenetic Study ◽  
East Atlantic ◽  
Bathymetric Distribution ◽  
North East ◽  
First Time ◽  
A New Species ◽  
Icelandic Waters

Based on material collected during the BIOICE project, the taxonomy and distribution of Terebellides (Polychaeta; Trichobranchidae) in Icelandic waters is presented. Terebellides stroemii Sars, 1853 and Terebellides gracilis Malm, 1874 (as Terebellides williamsae Jirkov, 1989) were previously reported from the area. Terebellides atlantis Williams, 1984 is reported for the first time after the original description and redescribed. Terebellides bigeniculatus sp. nov. is diagnosed by the presence of two thoracic chaetigers with geniculate chaetae. Terebellides williamsae Jirkov, 1989 is proposed as a junior synonym of T. gracilis, whose holotype is redescribed herein. Several body characters with high taxonomic value in Terebellides are reviewed under the SEM; additions to the diagnosis and new potential characters for a future taxonomic revision and phylogenetic study of the genus are also suggested. The geographical and bathymetric distribution of each species in relation to the GIF Ridge is discussed, and a key to Terebellides species from North East Atlantic waters is provided.

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