Early Life Stage Mortality Syndrome in Fishes of the Great Lakes and Baltic Sea

1998 ◽  
Keyword(s):  
Reproductive Success ◽  
Baltic Sea ◽  
High Mortality ◽  
Thiamine Deficiency ◽  
Barents Sea ◽  
Yolk Sac ◽  
The Baltic Sea ◽  
Subcutaneous Edema ◽  
The Baltic ◽  
Dependent Mortality

<em>Abstract</em>.—The reproductive success of cod <em>Gadus morhua </em>from the Baltic Sea and the Barents Sea was compared. The offspring of 17 family pairs from the Baltic Sea and 12 family pairs from the Barents Sea were investigated during the embryonic and larval development stages. Frequencies of mortality over time and frequencies of different disorders at hatch were analyzed. The results indicated that the reproductive success of cod from the Baltic Sea was seriously impaired. The Baltic cod showed high mortality before hatch. In newly hatched larvae, different kinds of disorders were seen, such as vertebrae deformity, disrupted yolk sac or subcutaneous edema in the yolk sac, and precipitate in the yolk. To compare mortality and early developmental abnormalities in Baltic cod and Baltic salmon <em>Salmo salar</em>, the offspring of 20 salmon family pairs, caught in the River Dalälven in Sweden, were investigated analogically. The results showed that the majority of the salmon offspring experienced a thiamine deficiency-dependent mortality at different stages of larval development and that five family pairs experienced high mortality before hatch. In salmon, different kinds of disorders were also seen at hatch, such as vertebrae deformity, blood disorders, subcutaneous edema in the yolk sac, and precipitate in the yolk. The disorders at hatch were not correlated to later thiamine deficiency-dependent mortality. Aliquots of newly fertilized salmon eggs were injected with thiamine by the nanoinjection method. This treatment had only a minor effect on the frequency of disorders at hatch, but it protected the salmon larvae almost completely from later thiamine deficiency-dependent mortality. This indicates that factors other than thiamine deficiency are involved in the developmental disorders. In both salmon and cod from the Baltic Sea, the mortality and disorders among the offspring were mainly correlated to the female, and in both species some females produced offspring that experienced high mortality before hatch. Both salmon and cod also showed disorders that might have similar biochemical mechanisms, because the formation of precipitates and edema in the yolk sac occurs in both species.

scholarly journals Adult female European perch (Perca fluviatilis) from the Baltic Sea show no evidence of thiamine deficiency

2021 ◽  
pp. 102081
Author(s):  
Johan Gustafsson ◽  
Karin Ström ◽  
Linus Arvstrand ◽  
Lars Förlin ◽  
Lillemor Asplund ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Adult Female ◽  
Thiamine Deficiency ◽  
Perca Fluviatilis ◽  
The Baltic Sea ◽  
European Perch ◽  
Perch Perca Fluviatilis ◽  
The Baltic

Results of measuring the aerosol characteristics in 80th cruise of RV “Akademik Mstislav Keldysh” on the route from the Baltic Sea to the Barents Sea

2021 ◽  
Vol 34 (7) ◽  
pp. 515-523
Author(s):  
S.M. Sakerin ◽  
D.M. Kabanov ◽  
D.A. Kalashnikova ◽  
I.A. Kruglinsky ◽  
V.I. Makarov ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Barents Sea ◽  
The Baltic Sea ◽  
The Barents Sea ◽  
The Baltic

scholarly journals Fatty acid signatures connect thiamine deficiency with the diet of the Atlantic salmon (Salmo salar) feeding in the Baltic Sea

2018 ◽  
Vol 165 (10) ◽  
Author(s):  
Marja Keinänen ◽  
Reijo Käkelä ◽  
Tiina Ritvanen ◽  
Jukka Pönni ◽  
Hannu Harjunpää ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Atlantic Salmon ◽  
Baltic Sea ◽  
Salmo Salar ◽  
Thiamine Deficiency ◽  
The Baltic Sea ◽  
Atlantic Salmon Salmo Salar ◽  
The Baltic

REPRODUCTIVE SUCCESS OF FUCUS VESICULOSUS (PHAEOPHYCEAE) IN THE BALTIC SEA

1999 ◽  
Vol 35 (2) ◽  
pp. 254-269 ◽  
Author(s):  
Ester A. Serrão ◽  
Susan H. Brawley ◽  
Jenny Hedman ◽  
Lena Kautsky ◽  
Göran Samuelsson
Keyword(s):  
Reproductive Success ◽  
Baltic Sea ◽  
Fucus Vesiculosus ◽  
The Baltic Sea ◽  
The Baltic

scholarly journals The northern European shelf as increasing net sink for CO<sub>2</sub>

2020 ◽  
Author(s):  
Meike Becker ◽  
Are Olsen ◽  
Peter Landschützer ◽  
Abdirhaman Omar ◽  
Gregor Rehder ◽  
...  
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
Barents Sea ◽  
The Baltic Sea ◽  
Surface Ocean ◽  
The North ◽  
Northern European ◽  
The Barents Sea ◽  
The North Sea ◽  
The Baltic

Abstract. We developed a simple method to refine existing open ocean maps towards different coastal seas. Using a multi linear regression we produced monthly maps of surface ocean fCO2 in the northern European coastal seas (North Sea, Baltic Sea, Norwegian Coast and in the Barents Sea) covering a time period from 1998 to 2016. A comparison with gridded SOCAT v5 data revealed standard deviations of the residuals 0 ± 26 μatm in the North Sea, 0 ± 16 μatm along the Norwegian Coast, 0 ± 19 μatm in the Barents Sea, and 2 ± 42 μatm in the Baltic Sea.We used these maps as basis to investigate trends in fCO2, pH and air-sea CO2 flux. The surface ocean fCO2 trends are smaller than the atmospheric trend in most of the studied region. Only the western part of the North Sea is showing an increase in fCO2 close to 2 μatm yr−1, which is similar to the atmospheric trend. The Baltic Sea does not show a significant trend. Here, the variability was much larger than possibly observable trends. Consistently, the pH trends were smaller than expected for an increase of fCO2 in pace with the rise of atmospheric CO2 levels. The calculated air-sea CO2 fluxes revealed that most regions were net sinks for CO2. Only the southern North Sea and the Baltic Sea emitted CO2 to the atmosphere. Especially in the northern regions the sink strength increased during the studied period.

scholarly journals The northern European shelf as an increasing net sink for CO<sub>2</sub>

2021 ◽  
Vol 18 (3) ◽  
pp. 1127-1147
Author(s):  
Meike Becker ◽  
Are Olsen ◽  
Peter Landschützer ◽  
Abdirhaman Omar ◽  
Gregor Rehder ◽  
...  
Keyword(s):  
Baltic Sea ◽  
North Sea ◽  
Barents Sea ◽  
The Baltic Sea ◽  
Surface Ocean ◽  
The North ◽  
Northern European ◽  
The Barents Sea ◽  
The North Sea ◽  
The Baltic

Abstract. We developed a simple method to refine existing open-ocean maps and extend them towards different coastal seas. Using a multi-linear regression we produced monthly maps of surface ocean fCO2 in the northern European coastal seas (the North Sea, the Baltic Sea, the Norwegian Coast and the Barents Sea) covering a time period from 1998 to 2016. A comparison with gridded Surface Ocean CO2 Atlas (SOCAT) v5 data revealed mean biases and standard deviations of 0 ± 26 µatm in the North Sea, 0 ± 16 µatm along the Norwegian Coast, 0 ± 19 µatm in the Barents Sea and 2 ± 42 µatm in the Baltic Sea. We used these maps to investigate trends in fCO2, pH and air–sea CO2 flux. The surface ocean fCO2 trends are smaller than the atmospheric trend in most of the studied regions. The only exception to this is the western part of the North Sea, where sea surface fCO2 increases by 2 µatm yr−1, which is similar to the atmospheric trend. The Baltic Sea does not show a significant trend. Here, the variability was much larger than the expected trends. Consistently, the pH trends were smaller than expected for an increase in fCO2 in pace with the rise of atmospheric CO2 levels. The calculated air–sea CO2 fluxes revealed that most regions were net sinks for CO2. Only the southern North Sea and the Baltic Sea emitted CO2 to the atmosphere. Especially in the northern regions the sink strength increased during the studied period.

Size-dependent winter mortality of age-0 pikeperch (Stizostedion lucioperca) in Pärnu Bay, the Baltic Sea

2000 ◽  
Vol 57 (2) ◽  
pp. 451-458 ◽  
Author(s):  
Jyrki Lappalainen ◽  
Vaike Erm ◽  
Jakob Kjellman ◽  
Hannu Lehtonen
Keyword(s):  
Baltic Sea ◽  
Water Temperature ◽  
Ice Cover ◽  
Winter Mortality ◽  
The Baltic Sea ◽  
Size Dependent ◽  
The Baltic ◽  
Stizostedion Lucioperca ◽  
Dependent Mortality

Winter mortality of pikeperch (Stizostedion lucioperca) at age 0 is dependent on size, based on samples collected with trawls during 1961-1994 in Pärnu Bay, Estonia. Mortality increased as mean length of pikeperch in the first autumn decreased. The size-dependent mortality was analysed as correlation between mean lengths at age 0 in autumn and changes in mean lengths between age 1 and age 0. When the varying lengths at age 0 were taken into account, the duration of winter also affected mortality; longer durations of ice cover resulted in less size-dependent winter mortality. Since mean length at age 0 in autumn correlated positively with summer water temperature, winter mortality can be expected to decrease the warmer the summer.

The spiny-cheek crayfish Orconectes limosus (Rafinesque, 1817) as an inhabitant of the Baltic Sea — experimental evidences for its invasion of brackish waters

2011 ◽  
Vol 40 (3) ◽  
Author(s):  
Joanna Jaszczołt ◽  
Anna Szaniawska
Keyword(s):  
Reproductive Success ◽  
Baltic Sea ◽  
Hatching Success ◽  
The Baltic Sea ◽  
Orconectes Limosus ◽  
Brackish Waters ◽  
Low Salinity ◽  
Length Increment ◽  
The Baltic

AbstractThe main aim of the present study was to determine the effect of low salinity conditions (3 PSU and 7 PSU) on the hatching success, growth and mortality of Orconectes limosus. The results revealed that berried females survived exposure to salinities of 3 PSU and 7 PSU whilst incubating their eggs. The reproductive success reached 100% at both salinities. The length increment of young crayfish per molt was larger at 7 PSU than at 3 PSU — but their condition was affected by higher salinity. The mortality among juveniles reached approximately 50% within 5 weeks of hatching at both salinities.

scholarly journals Species identification based on a semi-diagnostic marker: Evaluation of a simple conchological test for distinguishing blue mussels Mytilus edulis L. and M. trossulus Gould

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0249587
Author(s):  
Vadim Khaitov ◽  
Julia Marchenko ◽  
Marina Katolikova ◽  
Risto Väinölä ◽  
Sarah E. Kingston ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Mytilus Edulis ◽  
Species Identification ◽  
Barents Sea ◽  
White Sea ◽  
The Arctic ◽  
The White Sea ◽  
The Baltic Sea ◽  
Blue Mussels ◽  
The Baltic

Cryptic and hybridizing species may lack diagnostic taxonomic characters leaving researchers with semi-diagnostic ones. Identification based on such characters is probabilistic, the probability of correct identification depending on the species composition in a mixed population. Here we test the possibilities of applying a semi-diagnostic conchological character for distinguishing two cryptic species of blue mussels, Mytilus edulis and M. trossulus. These ecologically, stratigraphically and economically important molluscs co-occur and hybridize in many areas of the North Atlantic and the neighboring Arctic. Any cues for distinguishing them in sympatry without genotyping would save much research effort. Recently these species have been shown to statistically differ in the White Sea, where a simple character of the shell was used to distinguish two mussel morphotypes. In this paper, we analyzed the associations between morphotypes and species-specific genotypes based on an abundant material from the waters of the Kola Peninsula (White Sea, Barents Sea) and a more limited material from Norway, the Baltic Sea, Scotland and the Gulf of Maine. The performance of the “morphotype test” for species identification was formally evaluated using approaches from evidence-based medicine. Interspecific differences in the morphotype frequencies were ubiquitous and unidirectional, but their scale varied geographically (from 75% in the White Sea to 15% in the Baltic Sea). In addition, salinity-related variation of this character within M. edulis was revealed in the Arctic Barents Sea. For every studied region, we established relationships between the proportions of the morphotypes in the populations as well as between the proportions of the morphotypes in samples and the probabilities of mussels of different morphotypes being M. trossulus and M. edulis. We provide recommendations for the application of the morphotype test to mussels from unstudied contact zones and note that they may apply equally well to other taxa identified by semi-diagnostic traits.

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