Otolith increments in European plaice (Pleuronectes platessa) reveal temperature and density-dependent effects on growth

2018 ◽  
Vol 75 (5) ◽  
pp. 1655-1663 ◽  
Author(s):  
Peter van der Sleen ◽  
Christoph Stransky ◽  
John R Morrongiello ◽  
Holger Haslob ◽  
Melita Peharda ◽  
...  
Keyword(s):  
Environmental Factors ◽  
North Sea ◽  
Bottom Temperature ◽  
Growth Data ◽  
Mixed Effect ◽  
Pleuronectes Platessa ◽  
Growing Season Length ◽  
The North ◽  
Growth Variation ◽  
The North Sea

Abstract European plaice (Pleuronectes platessa) is a commercially important flatfish species in the North Sea. Yet, the environmental factors that affect the growth of plaice remain unresolved. Here we examine the drivers of plaice growth variation by using a large archive of otoliths from female plaice collected in the northeastern part of the North Sea from 1993 to 2015, providing growth data over the period 1985–2014. We developed a series of increasingly complex mixed-effect models to explore intrinsic (within individual) and extrinsic (environmental factors: bottom temperature and plaice density) sources of growth variation. We analysed juvenile (0 and 1 year) and (sub)adult (≥2 years) growth separately due to different habitat utilization across life stages. Juvenile growth was positively correlated with bottom temperature, whereas growth of adults was negatively correlated with bottom temperature. Correlations for both were strongest during autumn (September to October). For juveniles, the temperature–growth relationship likely reflects a response to growing season length while for adults it could reflect temperature-dependent changes to metabolic rate or food availability. For both juveniles and adults, we also found inverse relationship between population density and growth. We suggest that the approach used in this study can find a much wider application in European waters.

Fecundity and maturity of plaice (Pleuronectes platessa) from Cardigan Bay

1990 ◽  
Vol 70 (3) ◽  
pp. 515-529 ◽  
Author(s):  
J.W. Horwood
Keyword(s):  
North Sea ◽  
Egg Size ◽  
Fine Tuning ◽  
Irish Sea ◽  
Age At Maturity ◽  
Marked Contrast ◽  
Pleuronectes Platessa ◽  
The North ◽  
The North Sea ◽  
Surrounding Areas

Measurements of fecundity are given for plaice (Pleuronedes platessa L.) sampled from Cardigan Bay. Values were compared with those obtained in 1953 from Cardigan Bay and from the eastern Irish Sea, and no differences were found; a marked contrast to results from the North Sea. Analysis of egg size showed that eggs develop earlier in older fish. A mechanism for ‘fine-tuning’ of fecundity is discussed. Size and age at maturity are calculated for Cardigan Bay plaice, and are compared with rates from surrounding areas. Plaice mature at an earlier age in Cardigan Bay.

scholarly journals Molecular identification of European flounder (Platichthys flesus) and its hybrids with European plaice (Pleuronectes platessa)

2009 ◽  
Vol 66 (5) ◽  
pp. 902-906 ◽  
Author(s):  
Agnieszka Kijewska ◽  
Artur Burzyński ◽  
Roman Wenne
Keyword(s):  
Molecular Markers ◽  
Baltic Sea ◽  
North Sea ◽  
Pleuronectes Platessa ◽  
Platichthys Flesus ◽  
The North ◽  
D Loop ◽  
The North Sea ◽  
European Flounder ◽  
The Baltic

AbstractKijewska, A., Burzyński, A., and Wenne, R. 2009. Molecular identification of European flounder (Platichthys flesus) and its hybrids with European plaice (Pleuronectes platessa). – ICES Journal of Marine Science, 66: 902–906. European flounder (Platichthys flesus) and plaice (Pleuronectes platessa) are commercially important marine fish species inhabiting the continental shelf waters of Europe. Morphological similarity between the two makes it difficult to identify their hybrids, so species misclassification can generate errors in defining stocks in terms of their conservation and management. Flounder and plaice populations from the North Sea and the Baltic Sea were studied. Mitochondrial DNA (mtDNA) was used to confirm the morphological species identification. The set of molecular markers, two mitochondrial (cytochrome b and D-loop) and two nuclear (the ribosomal marker ITS and parathyroid hormone-related protein gene), was constructed to identify the two flatfish species and their hybrids. “Pure” flounder (P. flesus) were observed in the Bay of Gdańsk, Baltic Sea, and off the coast of Denmark in the North Sea. The fishing area near Bornholm in the Baltic is rich in P. flesus × P. platessa hybrids. The length difference of the amplified D-loop fragment was used for species identification. The characteristics of heteroplasmy in the control region (D-loop) can be useful as a population marker in the European flounder. Our studies demonstrate the utility of mtDNA polymorphism combined with nuclear molecular markers for correct identification of the morphologically similar and hybridized European flounder and plaice.

scholarly journals 4DEMON: Integrating 40 Years of Data on PCB and Metal Contamination in Marine Sediments of the Belgian Part of the North Sea

2021 ◽  
Vol 8 ◽  
Author(s):  
Hong Minh Le ◽  
Karen Bekaert ◽  
Ruth Lagring ◽  
Bart Ampe ◽  
Ann Ruttens ◽  
...  
Keyword(s):  
North Sea ◽  
Marine Environment ◽  
Historical Data ◽  
Anthropogenic Activities ◽  
Added Value ◽  
Mixed Effect ◽  
Broad Perspective ◽  
The North ◽  
The North Sea

The assessment of historical data is important to understand long-term changes in the marine environment. Whereas time series analyses based on monitoring data typically span one or two decades, this work aimed to integrate 40 years of monitoring and research data on polychlorinated biphenyls (PCBs) and metals in the Belgian Part of the North Sea (BPNS). Multiple challenges were encountered: sampling locations changed over time, different analytical methods were applied, different grain size fractions were analyzed, appropriate co-factors were not always analyzed, and measurement uncertainties were not always indicated. These issues hampered the use of readily available, highly standardized trend modeling approaches like those proposed by regional sea conventions such as OSPAR, named after the Oslo and Paris conventions.Therefore, we applied alternative approaches, allowing us to include most older historical data that have been obtained during the nineteen seventies and eighties. Our approach included reproducible and quality controlled procedures from data collection up to data assessment. It included spatial clustering, data normalization and parametric linear mixed effect modeling. A Ward hierarchical clustering was applied on recently obtained contaminant data, as the basis for a spatial division of the BPNS into five distinct areas with different contamination profiles. To minimize the risk of normalization errors for the metal data analyses, four normalization approaches were applied and mutually compared: granulometric and nickel (Ni) normalization, next to two hybrid normalization methods combining aluminum (Al) and iron (Fe) normalization. The long-term models revealed decreasing trends for most metals, except zinc (Zn) for which three out of four models showed increasing concentrations in all five zones of the BPNS. Offshore sediments contained the lowest normalized mercury (Hg) and cadmium (Cd) concentrations but high arsenic (As) concentrations. Trend analysis revealed a strong decrease in PCB concentrations in the nineteen eighties and nineties, followed by a slight increase over the last decade. The extended timeframe for contaminant assessment, as applied in this study, is of added value for scientists and policy makers, as the approach allows to detect trends and effects of anthropogenic activities within the marine environment within a broad perspective.

The Fecundity of Clyde Plaice

1958 ◽  
Vol 37 (2) ◽  
pp. 309-312 ◽  
Author(s):  
T. B. Bagenal
Keyword(s):  
North Sea ◽  
Mature Female ◽  
Small Samples ◽  
Pleuronectes Platessa ◽  
The North ◽  
The North Sea

In early 1956 and again in 1957 small samples of mature female Plaice Pleuronectes platessa L. were collected for fecundity estimates to be compared with Simpson's (1951) results for the North Sea populations, and the data from elsewhere that Simpson summarizes.

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