scholarly journals Ovarian weight of the Baltic herring (Clupea harengus membras) in relation to spawning time in the Archipelago Sea, northern Baltic

2001 ◽  
Vol 58 (1) ◽  
pp. 106-113 ◽  
Author(s):  
M Rajasilta
Keyword(s):  
Clupea Harengus ◽  
Ovarian Weight ◽  
Baltic Herring ◽  
Archipelago Sea ◽  
Spawning Time ◽  
The Baltic

Relationship between Food, Fat, Sexual Maturation, and Spawning Time of Baltic Herring (Clupea harengus membras) in the Archipelago Sea

1992 ◽  
Vol 49 (4) ◽  
pp. 644-654 ◽  
Author(s):  
Marjut Rajasilta
Keyword(s):  
Nutritional Status ◽  
Gonadosomatic Index ◽  
Fat Content ◽  
Clupea Harengus ◽  
Gonad Maturation ◽  
Gonad Weight ◽  
Baltic Herring ◽  
Archipelago Sea ◽  
The Baltic ◽  
Timing Of Spawning

The effect of nutritional status on gonad maturation and timing of spawning was examined in the Baltic herring (Clupea harengus membras) in the Archipelago Sea. Fish were collected from overwintering areas in December and from the spawning grounds in May–July. Muscle fat content, amount of mesenteric fat, and condition factor were used as indicators of nutritional status of fish. In winter, fish were highly variable with substantial individual variation in nutritional status, gonad stage, gonad weight, and gonadosomatic index (GSI). Gonad weight was related to fat content, suggesting a close relationship with fish nutritional status and maturation rate. Spawning fish were separable into early and late spawners according to fat content, gonad weight, and GSI but not according to length. The spawning shoals consisted of mixtures of fish of all sizes. I concluded that in the study area, individual maturation cycles vary and timing of spawning is primarily determined by the feeding conditions prior to spawning.

Some Speculations about the Baltic Herring (Clupea harengus membras) in Connection with the Eutrophication of the Baltic Sea

1985 ◽  
Vol 42 (S1) ◽  
pp. s83-s90 ◽  
Author(s):  
G. Aneer
Keyword(s):  
Baltic Sea ◽  
Clupea Harengus ◽  
Filamentous Algae ◽  
The Baltic Sea ◽  
Baltic Herring ◽  
Significant Difference ◽  
Spawning Time ◽  
Low Levels ◽  
The Baltic

In this paper the hypothesis is put forward that Baltic herring (Clupea harengus membras) spawning time, spring or autumn, is determined by feeding conditions during the adult phase and thus not genetically fixed. The present "absence" of autumn spawners is thought to be the result of improved feeding conditions during the latest decades as a result of the eutrophication of the Baltic Sea. During two spawning ground studies carried out in 1978 and 1982 unusually high mortality rates were noted for eggs in situ. In 1982, during 4 wk close to peak of spawning, the mortality increased substantially, especially for eggs among filamentous algae. A significant difference was noted between eggs on coarser algae and those among filamentous algae (p < 0.001). During this period the average mortalities were 33 and 75%, respectively. Very low levels of oxygen were measured at night among the filamentous algae. An increase in the amounts of this type of algae as a response to the eutrophication might constitute a new hazard to the reproductive success of the Baltic herring.

Influence of environmental conditions, population density, and prey type on the lipid content in Baltic herring (Clupea harengus membras) from the northern Baltic Sea

2019 ◽  
Vol 76 (4) ◽  
pp. 576-585 ◽  
Author(s):  
Marjut Rajasilta ◽  
Jari Hänninen ◽  
Lea Laaksonen ◽  
Päivi Laine ◽  
Jukka-Pekka Suomela ◽  
...  
Keyword(s):  
Climate Change ◽  
Baltic Sea ◽  
Lipid Content ◽  
Sea Water ◽  
Energy Content ◽  
Global Climate ◽  
Clupea Harengus ◽  
Composition Analysis ◽  
Baltic Herring ◽  
The Baltic

Global climate change can affect the energy content of fish by altering their lipid physiology and consumption. We investigated the effects of different environmental stressors on the lipid content of the Baltic herring (Clupea harengus membras) from spawning ground samples that were collected annually in the northern Baltic Sea. During 1987–2014, the average lipid content of herring muscle decreased from 5%–6% (wet mass) to 1.5% (wet mass). Generalized linear mixed models indicated that sea water salinity and the size of the herring stock explained best the declining trend of lipid content. We estimated that the amount of the lipid storage incorporated in the spawning stock decreased by approximately 45% during the study, with respective energy content decreases. Fatty acid composition analysis revealed that herring lipids contained a high proportion of EPA (eicosapentaenoic acid; 20:5n-3) and DHA (docosahexaenoic acid; 22:6n-3), which likely originated from its main summertime prey, Limnocalanus macrurus. The results illustrate various climate change-induced processes leading to changes in the lipid content of the Baltic herring and, consequently, to changes in the energy flows of the northern Baltic ecosystem.

scholarly journals Decreasing salinity improves the feeding conditions of the Baltic herring (Clupea harengus membras) during spring in the Bothnian Sea, northern Baltic

2014 ◽  
Vol 71 (5) ◽  
pp. 1148-1152 ◽  
Author(s):  
M. Rajasilta ◽  
J. Hänninen ◽  
I. Vuorinen
Keyword(s):  
Stomach Contents ◽  
Clupea Harengus ◽  
Trophic Levels ◽  
Baltic Herring ◽  
Important Link ◽  
Limnocalanus Macrurus ◽  
The Baltic ◽  
Bothnian Sea

Abstract The stomach contents of the herring (Clupea harengus membras L.) from the Bothnian Sea, northern Baltic, were analysed during spring 2011 and 2013. The stomachs were full of Limnocalanus macrurus in May and June, and an improvement in the condition of herring was observed when fish started to feed on this prey. The analyses showed that Limnocalanus is currently an important link between lower trophic levels and Baltic herring in the Bothnian Sea.

scholarly journals Structure and Characterization of Phosphoglucomutase 5 from Atlantic and Baltic Herring—An Inactive Enzyme with Intact Substrate Binding

Biomolecules ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1631
Author(s):  
Robert Gustafsson ◽  
Ulrich Eckhard ◽  
Weihua Ye ◽  
Erik D. Enbody ◽  
Mats Pettersson ◽  
...  
Keyword(s):  
Enzymatic Activity ◽  
Active Site ◽  
Muscle Protein ◽  
Substrate Binding ◽  
Clupea Harengus ◽  
Metabolic Enzyme ◽  
Structure Comparison ◽  
Baltic Herring ◽  
The Baltic

Phosphoglucomutase 5 (PGM5) in humans is known as a structural muscle protein without enzymatic activity, but detailed understanding of its function is lacking. PGM5 belongs to the alpha-D-phosphohexomutase family and is closely related to the enzymatically active metabolic enzyme PGM1. In the Atlantic herring, Clupea harengus, PGM5 is one of the genes strongly associated with ecological adaptation to the brackish Baltic Sea. We here present the first crystal structures of PGM5, from the Atlantic and Baltic herring, differing by a single substitution Ala330Val. The structure of PGM5 is overall highly similar to structures of PGM1. The structure of the Baltic herring PGM5 in complex with the substrate glucose-1-phosphate shows conserved substrate binding and active site compared to human PGM1, but both PGM5 variants lack phosphoglucomutase activity under the tested conditions. Structure comparison and sequence analysis of PGM5 and PGM1 from fish and mammals suggest that the lacking enzymatic activity of PGM5 is related to differences in active-site loops that are important for flipping of the reaction intermediate. The Ala330Val substitution does not alter structure or biophysical properties of PGM5 but, due to its surface-exposed location, could affect interactions with protein-binding partners.

scholarly journals Discrimination of western Baltic spring-spawning and central Baltic herring (Clupea harengus L.) based on growth vs. natural tag information

2013 ◽  
Vol 70 (6) ◽  
pp. 1108-1117 ◽  
Author(s):  
Tomas Gröhsler ◽  
Rainer Oeberst ◽  
Matthias Schaber ◽  
Niklas Larson ◽  
Georgs Kornilovs
Keyword(s):  
Age Groups ◽  
Clupea Harengus ◽  
Commercial Fisheries ◽  
Survey Area ◽  
Separation Function ◽  
The Baltic Sea ◽  
Quick Method ◽  
Baltic Herring ◽  
Abundance Indices ◽  
The Baltic

Abstract Gröhsler, T., Oeberst, R., Schaber, M., Larson, N., and Kornilovs, G. 2013. Discrimination of western Baltic spring-spawning and central Baltic herring (Clupea harengus L.) based on growth vs. natural tag information. – ICES Journal of Marine Science, 70: 1108–1117. In the Baltic Sea, several stocks of herring (Clupea harengus L.) are surveyed and managed separately. For assessment purposes, a spatial stock separation based on ICES subdivisions is implemented. However, especially in the western Baltic, the distribution areas of two stocks, the western Baltic spring-spawning herring and the central Baltic herring, overlap. Results of regularly conducted surveys for assessment purposes indicated variable degrees of mixing of both stocks in the survey area, based on conspicuous differences in weights/lengths within certain age groups, especially in an area known for overlapping distribution of both stocks. At present, varying fractions of the central Baltic herring stock have not been taken into account during regular surveys conducted in the western Baltic, leading to possible undetected biases in assessment indices derived from these surveys. Additionally, methods otherwise applied for stock separation of Baltic herring so far are based on parameters that cannot readily be derived during regular surveys. In this paper, we present a simple and quick method to reliably allocate herring to either stock based on a separation function derived from survey-based length-at-age data, thus facilitating a more precise estimate of biomass and abundance indices from regular surveys and commercial fisheries.

Anthropogenic and naturally produced brominated substances in Baltic herring (Clupea harengus membras) from two sites in the Baltic Sea

Chemosphere ◽  
2016 ◽  
Vol 144 ◽  
pp. 2408-2414 ◽  
Author(s):  
Anna-Karin Dahlberg ◽  
Anders Bignert ◽  
Jessica Legradi ◽  
Juliette Legler ◽  
Lillemor Asplund
Keyword(s):  
Baltic Sea ◽  
Clupea Harengus ◽  
The Baltic Sea ◽  
Baltic Herring ◽  
The Baltic
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