Seasonal changes in the north-eastern Atlantic mackerel diet (Scomber scombrus) in the north of Spain (ICES Division VIIIc)

2005 ◽  
Vol 85 (2) ◽  
pp. 415-418 ◽  
Author(s):  
Ignacio Olaso ◽  
José L. Gutiérrez ◽  
Begoña Villamor ◽  
Pablo Carrera ◽  
Luis Valdés ◽  
...  
Keyword(s):  
Seasonal Changes ◽  
Content Volume ◽  
Gelatinous Zooplankton ◽  
East Atlantic ◽  
Atlantic Mackerel ◽  
North East ◽  
The North ◽  
North Eastern ◽  
Stomach Weight ◽  
North Of Spain

Seasonal changes in the diet of the Atlantic mackerel from the north-east Atlantic in ICES Division VIIIc during the period 1988–1999. The diet of juvenile (21–29 cm) and adult mackerel (30–45 cm) in this area in spring (the spawning season) and autumn varied in composition and size of prey. In spring, the average prey weight was 0·009 g and the number of prey was 180 individuals per stomach, with the average stomach content volume being 1·62 g (0·60% BW [body weight]), and 1·50 g (0·51% BW) when considering the empty stomachs. In autumn, the average prey weight was 0·28 g, the average number of prey per stomach was 17, and the average stomach weight that contained food was three times higher than in spring, and 2·3 times when considering the empty stomachs. In spring, the diet of the juveniles consisted of euphausiids, crustacean larvae and other zooplankton, whereas euphausiids formed 90% of the diet in the adults. In addition, during this period mackerel were cannibalistic, feeding on their own eggs. In autumn, the juveniles ate hyperiids and other, mainly gelatinous zooplankton, whereas for the adults blue whiting were clearly important, since they comprised 90% of the stomach weight.

The Comparative Feeding Ecology of Six Species of Shark and Four Species of Ray (Elasmobranchii) In The North-East Atlantic

1996 ◽  
Vol 76 (1) ◽  
pp. 89-106 ◽  
Author(s):  
J.R. Ellis ◽  
M.G. Pawson ◽  
S.E. Shackley
Keyword(s):  
Feeding Ecology ◽  
Stomach Contents ◽  
Generalist Predators ◽  
Dietary Overlap ◽  
East Atlantic ◽  
Dietary Breadth ◽  
North East ◽  
The North ◽  
North Eastern ◽  
Commercial Species

The stomach contents of ten species of elasmobranch from the north-eastern Atlantic indicate that most are generalist predators, eating a variety of polychaetes, molluscs, crustaceans and teleosts. Two species, Mustelus asterias and Squatina scjuatina were found to be specialist feeders, consuming portunid crabs and pleuronectids, respectively. Measures for both dietary breadth and dietary overlap are given and the implications of elasmobranch predation on the prey communities and on commercial species are discussed.

Octomagelona bizkaiensis (Polychaeta: Magelonidae) a new genus and species from the Capbreton Canyon (Bay of Biscay, north-east Atlantic)

2001 ◽  
Vol 81 (2) ◽  
pp. 221-224 ◽  
Author(s):  
Florencio Aguirrezabalaga ◽  
Argiloa Ceberio ◽  
Dieter Fiege
Keyword(s):  
New Genus ◽  
Bay Of Biscay ◽  
New Genus And Species ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
The Family ◽  
North Eastern

Octomagelona bizkaiensis (Annelida: Polychaeta), a new genus and species of the family Magelonidae is described from the north-eastern Atlantic. The specimens were collected from the Capbreton Canyon, Bay of Biscay, at a depth of 1000–1040 m. The new genus and species differs from all known genera and species of the family Magelonidae by the presence of eight instead of nine thoracic chaetigers.

The “Lost Mackerel” of the North East Atlantic—The Flawed System of Trilateral and Bilateral Decision-making

2013 ◽  
Vol 28 (2) ◽  
pp. 343-373 ◽  
Author(s):  
Peter Ørebech
Keyword(s):  
Decision Making ◽  
East Atlantic ◽  
Total Allowable Catch ◽  
Fish Stocks ◽  
Atlantic Mackerel ◽  
North East ◽  
The North ◽  
Quota Allocation ◽  
Decision Making Processes ◽  
The Right

Abstract The North East Atlantic mackerel is moving westward and northward. How to integrate new coastal states whose Exclusive Economic Zone is invaded by mackerel into existing decision-making processes? The 1982 Law of the Sea Convention, the 1995 Straddling Fish Stocks Agreement, the 1980 North East Atlantic Fisheries Convention, and bilateral and trilateral agreements between “relevant coastal states” fail to provide rules for present decision-makers to incorporate newcomers. The present harvesting states are sovereign with regard to admitting or refusing newcomers. This article argues for a stricter obligation on coastal states to acknowledge the right of new harvesting nations to access decision-making processes for estimating total allowable catch and allocating quotas. Equitable distribution can occur if quota allocation is subject to principles that are less discretionary than the present ones. One solution is to estimate the ratio of biomass related to the share of coastal states in the distribution of eggs, larvae and fishable stock, and allocate a quota to each coastal and high seas fishing state accordingly.

The influence of submesoscale eddies on hydrochemical parameters and structural and functional characteristics of phytoplankton in the north-eastern part of the Black Sea

2019 ◽  
pp. 24-40
Author(s):  
Sergey B. Kuklev ◽  
Vladimir A. Silkin ◽  
Valeriy K. Chasovnikov ◽  
Andrey G. Zatsepin ◽  
Larisa A. Pautova ◽  
...  
Keyword(s):  
Anticyclonic Eddy ◽  
The Black Sea ◽  
Hydrochemical Parameters ◽  
North East ◽  
The North ◽  
Seasonal Thermocline ◽  
North Eastern ◽  
Quantitative Indicators ◽  
The City ◽  
North Eastern Part

On June 7, 2018, a sub-mesoscale anticyclonic eddy induced by the wind (north-east) was registered on the shelf in the area of the city of Gelendzhik. With the help of field multidisciplinary expedition ship surveys, it was shown that this eddy exists in the layer above the seasonal thermocline. At the periphery of the eddy weak variability of hydrochemical parameters and quantitative indicators of phytoplankton were recorded. The result of the formation of such eddy structure was a shift in the structure of phytoplankton – the annual observed coccolithophores bloom was not registered.

scholarly journals Thrust–wrench interference tectonics in the Gulf of Cadiz (Africa–Iberia plate boundary in the North-East Atlantic): Insights from analog models

2011 ◽  
Vol 289 (1-4) ◽  
pp. 135-149 ◽  
Author(s):  
João C. Duarte ◽  
Filipe M. Rosas ◽  
Pedro Terrinha ◽  
Marc-André Gutscher ◽  
Jacques Malavieille ◽  
...  
Keyword(s):  
Plate Boundary ◽  
Gulf Of Cadiz ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
Gulf Of Cádiz ◽  
Analog Models

Exceptional influx of oceanic species into the North Sea late 1997

1999 ◽  
Vol 79 (4) ◽  
pp. 737-739 ◽  
Author(s):  
M. Edwards ◽  
A.W.G. John ◽  
H.G. Hunt ◽  
J.A. Lindley
Keyword(s):  
North Sea ◽  
Indicator Species ◽  
Climatic Conditions ◽  
Historical Evidence ◽  
East Atlantic ◽  
North East ◽  
The North ◽  
The North Sea ◽  
Oceanic Species

Continuous Plankton Recorder records from the North Sea and north-east Atlantic from September 1997 to March 1998 indicate an exceptional influx of oceanic indicator species into the North Sea. These inflow events, according to historical evidence, have only occurred sporadically during this century. This exceptional inflow and previous inflow events are discussed in relation to their similarity in terms of their physical and climatic conditions.

Sign in / Sign up

Export Citation Format

Share Document