Parasite load of Atlantic cod Gadus morhua in the Baltic Sea assessed by the liver category method, and associations with infection density and critical condition

2021 ◽  
Author(s):  
Marie Plambech Ryberg ◽  
Bastian Huwer ◽  
Anders Nielsen ◽  
Jan Dierking ◽  
Kurt Buchmann ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Critical Condition ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Parasite Load ◽  
The Baltic Sea ◽  
Infection Density ◽  
The Baltic

scholarly journals Transcriptome analysis of gill tissue of Atlantic cod Gadus morhua L. from the Baltic Sea

2015 ◽  
Vol 23 ◽  
pp. 37-40 ◽  
Author(s):  
Magdalena Małachowicz ◽  
Agnieszka Kijewska ◽  
Roman Wenne
Keyword(s):  
Baltic Sea ◽  
Transcriptome Analysis ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Gill Tissue ◽  
The Baltic Sea ◽  
The Baltic

Biological indications of contaminant exposure in Atlantic cod (Gadus morhua) in the Baltic Sea

2008 ◽  
Vol 65 (6) ◽  
pp. 1122-1134 ◽  
Author(s):  
Sabine Schnell ◽  
Doris Schiedek ◽  
Rolf Schneider ◽  
Lennart Balk ◽  
Pekka J. Vuorinen ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Organic Contaminants ◽  
Gadus Morhua ◽  
Polychlorinated Biphenyl ◽  
Atlantic Cod ◽  
Human Impacts ◽  
Toxic Substances ◽  
The Baltic Sea ◽  
Contaminant Exposure ◽  
The Baltic

The Baltic Sea is exposed to severe human impacts. Besides eutrophication and overfishing, a variety of chemical contaminants threaten the health of fish. During a cruise in December 2001, Atlantic cod ( Gadus morhua ) were collected in the western and southern Baltic Sea, somatic condition factors were estimated, and different biomarkers of contaminant exposure were analysed. Additionally, various polychlorinated biphenyl congeners and organochlorine pesticides were measured in cod liver as more general indicators of pollution, not necessarily as the causative agents for biomarker signals. In most specimens, hepatic ethoxyresorufin-O-deethylase activity and bile 1-OH pyrene, a common polycyclic aromatic hydrocarbon metabolite, were detectable. Both features indicate an induction of the CYP1A biotransformation system in response to toxic substances. The increased occurrence of DNA adducts in some of the specimens also indicates the presence of genotoxic substances. Acetylcholinesterase was inhibited, an indication of exposure to organophosphates, carbamates, or certain heavy metals, particularly in specimens taken at Wismar Bay and off the Lithuanian coast. In general, spatial differences in the biomarker responses as well as in contaminant loads were found, suggesting differences in physiologically active concentrations and mixtures of organic contaminants in this ecosystem.

scholarly journals Using the particle filter to geolocate Atlantic cod (Gadus morhua) in the Baltic Sea, with special emphasis on determining uncertainty

2007 ◽  
Vol 64 (4) ◽  
pp. 618-627 ◽  
Author(s):  
K H Andersen ◽  
A Nielsen ◽  
U H Thygesen ◽  
H -H Hinrichsen ◽  
S Neuenfeldt
Keyword(s):  
Baltic Sea ◽  
Particle Filter ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Day Length ◽  
Swimming Velocity ◽  
Spatial And Temporal Variability ◽  
The Baltic Sea ◽  
Time Step ◽  
The Baltic

The use of archival tags on fish gives information of individual behaviour with an unprecedented high resolution in time. A central problem in the analysis of data from retrieved tags is the geolocation, namely the infererence of movements of the fish by comparing the data from the tags with environmental observations like temperature, tide, day length, etc. The result is usually represented as a track; however, the spatial and temporal variability in the precision is often substantial. In this article, the particle filter is applied to geolocate Atlantic cod (Gadus morhua) in the Baltic Sea, leading to a representation of the results as probability distributions for each time step, thus giving an explicit representation of uncertainty. Furthermore, the method is used to estimate the magnitude of the error in the measurements by the tags and the swimming velocity of the fish. The average swimming velocity during a day was estimated to be around 0.20 m·s–1 for fish of ~60 cm length. The method is general and the presentation is formulated to facilitate implementation for different systems where other quantities are observed.

scholarly journals Effects of freezing on length and mass measurements of Atlantic cod Gadus morhua in the Baltic Sea

2019 ◽  
Vol 95 (6) ◽  
pp. 1486-1495 ◽  
Author(s):  
Kate McQueen ◽  
Monica Mion ◽  
Annelie Hilvarsson ◽  
Michele Casini ◽  
Hans J. Olesen ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Mass Measurements ◽  
The Baltic Sea ◽  
The Baltic

scholarly journals SNP genotyping reveals substructuring in weakly differentiated populations of Atlantic cod (Gadus morhua) from diverse environments in the Baltic Sea

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Roman Wenne ◽  
Rafał Bernaś ◽  
Agnieszka Kijewska ◽  
Anita Poćwierz-Kotus ◽  
Jakob Strand ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Snp Genotyping ◽  
The Baltic Sea ◽  
The Baltic

Genetic and morphological variation in Echinorhynchus gadi Zoega in Müller, 1776 (Acanthocephala: Echinorhynchidae) from Atlantic cod Gadus morhua L.

2011 ◽  
Vol 86 (1) ◽  
pp. 16-25 ◽  
Author(s):  
E. Sobecka ◽  
B. Szostakowska ◽  
K. MacKenzie ◽  
W. Hemmingsen ◽  
S. Prajsnar ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Population Biology ◽  
Gadus Morhua ◽  
Dna Analysis ◽  
Atlantic Cod ◽  
Morphological Features ◽  
The Baltic Sea ◽  
Systematic Classification ◽  
The North ◽  
The Baltic

AbstractPrevious studies have shown considerable variability in morphological features and the existence of genetically distinct sibling species in the acanthocephalan Echinorhynchus gadi Zoega in Müller, 1776. The aim of the present study was to follow up and extend those earlier studies by using a combination of DNA analysis and morphometrics to investigate differences between samples of E. gadi from Atlantic cod Gadus morhua L. caught at five fishing grounds in the Baltic Sea and three in different parts of the North Atlantic. Twelve morphological features were measured in 431 specimens of E. gadi, 99 individuals were studied by polymerase chain reaction-restriction fragment length polymorphosm (PCR-RFLP), and selected PCR products were sequenced. The molecular analyses showed the nucleotide sequences of E. gadi rDNA from cod caught at all the sampling sites to be identical. The comparative morphological study, in contrast, revealed significant differences between samples of E. gadi from different sampling sites and showed the separation of E. gadi into two groups corresponding approximately to the systematic classification of cod into the two subspecies, Atlantic G. morhua morhua and Baltic G. morhua callarias. The E. gadi infrapopulation size had a significant effect on some of the morphological features. The results are discussed in relation to cod population biology, the hydrography of the study area and the history of the Baltic Sea formation.

Sign in / Sign up

Export Citation Format

Share Document