Impact of environmental deviations on the larval and year-class abundances in the spring spawning herring (Clupea harengus membras L.) of the Gulf of Riga (Baltic Sea) in 1947–2004

2011 ◽  
Vol 107 (1-3) ◽  
pp. 159-168 ◽  
Author(s):  
E. Ojaveer ◽  
T. Arula ◽  
A. Lankov ◽  
H. Shpilev
Keyword(s):  
Baltic Sea ◽  
Clupea Harengus ◽  
Gulf Of Riga

Eurytemora affinis (Poppe, 1880) (Copepoda, Calanoida) in the Gulf of Riga, Baltic Sea — elemental composition and diurnal vertical migration

Crustaceana ◽  
2020 ◽  
Vol 93 (3-5) ◽  
pp. 447-466
Author(s):  
Astra Labuce ◽  
Solvita Strake ◽  
Inta Dimante-Deimantovica
Keyword(s):  
Surface Layer ◽  
Baltic Sea ◽  
Elemental Composition ◽  
Vertical Migration ◽  
Clupea Harengus ◽  
Elemental Content ◽  
Eurytemora Affinis ◽  
Diurnal Vertical Migration ◽  
Trade Offs ◽  
Gulf Of Riga

Abstract The present paper reports the results of two surveys conducted in the Gulf of Riga (Baltic Sea) during 1997. Elemental composition (carbon and nitrogen) and diurnal vertical migration (DVM) throughout development of the calanoid copepod Eurytemora affinis (Poppe, 1880) were studied. This is a species with a high genetic and morphological heterogeneity, inhabiting a seasonally stratified, herring (Clupea harengus Linnaeus, 1758) rich ecosystem. The DVM of copepods is a widespread advantageous behaviour, although with several trade-offs. At the expense of time spent in the food-richer surface layer, copepods avoid visual predators (planktivorous fish) by descending to greater depths, thereby decreasing their mortality. Being a part of the food web, copepods themselves serve as a source of nutrients with specific elemental contents. In the present study, we observed differences both in DVM and elemental content between the developmental stages of the studied species. The majority (57-89%) of nauplii and 1st to 3rd copepodids were found near the thermocline during daytime, whereas at night they were detected above the thermocline. The 5th stage copepodids and adults displayed evident nocturnal ascent, when most (>90%) individuals moved above 15 m depth. During daytime, they tended to disperse throughout the water column. Carbon (C%) and nitrogen (N%) in dry weight of E. affinis increased with ontogenetic development, reaching the highest values in 4th to 5th copepodids and adults. Adult males showed higher values of C% and N%, as well as an increased C : N molar ratio, compared to adult non-ovigerous females. The amount of time spent at the food-richer surface layer appeared to be related to N% in E. affinis.

scholarly journals Evidence from the past: exploitation as cause of commercial extinction of autumn-spawning herring in the Gulf of Riga, Baltic Sea

2018 ◽  
Vol 75 (7) ◽  
pp. 2476-2487
Author(s):  
Brian R MacKenzie ◽  
Henn Ojaveer
Keyword(s):  
Baltic Sea ◽  
Biological Data ◽  
Clupea Harengus ◽  
Marine Ecology ◽  
Resource Base ◽  
Fishery Resource ◽  
Animal Populations ◽  
Gulf Of Riga ◽  
Commercially Important ◽  
The Baltic

Abstract Historical marine ecology has shown that many exploited animal populations declined before their abundance was quantified by scientists. This situation applies for autumn-spawning herring (Clupea harengus) in the Baltic Sea. This stock used to be the dominant spawning group of herring in the early decades of the 1900s and supported several commercially important fisheries, including in the Gulf of Riga (GoR). However, the GoR stock declined during the 1960–1970s and has not recovered. Neither the former biomass nor reasons for its decline are known. Here, we recover and analyse historical fishery and biological data and conduct population development simulations to evaluate the hypothesis that exploitation may have been sufficient to lead the stock towards commercial extinction. We found that the estimated exploitation pattern, including exploitation of juveniles, was unsustainable and led to stock decline. The pattern of exploitation of this stock was consistent with that which caused collapses of other herring stocks, which have since recovered. If autumn-spawning herring in the GoR recovers, our findings indicate that this stock could support sustainable annual yields of ∼4000 t and diversify the fishery resource base, which is presently restricted to a relatively small number of species for essentially local coastal inhabitants.

Trophic decoupling of mesozooplankton production and the pelagic planktivores sprat Sprattus sprattus and herring Clupea harengus in the Central Baltic Sea

2018 ◽  
Vol 592 ◽  
pp. 181-196 ◽  
Author(s):  
M Bernreuther ◽  
J Peters ◽  
C Möllmann ◽  
J Renz ◽  
J Dutz ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Clupea Harengus ◽  
Sprattus Sprattus

scholarly journals Elemental Inventory in Fish Otoliths Reflects Natal Origin of Atlantic Herring (Clupea harengus) From Baltic Sea Juvenile Areas

2019 ◽  
Vol 6 ◽  
Author(s):  
Dorothee Moll ◽  
Paul Kotterba ◽  
Klaus Peter Jochum ◽  
Lena von Nordheim ◽  
Patrick Polte
Keyword(s):  
Baltic Sea ◽  
Clupea Harengus ◽  
Atlantic Herring ◽  
Natal Origin ◽  
Fish Otoliths

Modeling Relationships between Baltic Sea Herring (Clupea harengus) Biology and Contaminant Concentrations Using Multivariate Data Analysis

2010 ◽  
Vol 44 (23) ◽  
pp. 9018-9023 ◽  
Author(s):  
Katrin Lundstedt-Enkel ◽  
Rickard Bjerselius ◽  
Lillemor Asplund ◽  
Kerstin Nylund ◽  
Yang Liu ◽  
...  
Keyword(s):  
Data Analysis ◽  
Baltic Sea ◽  
Multivariate Data Analysis ◽  
Multivariate Data ◽  
Clupea Harengus

scholarly journals Distribution of benthic diatoms in the littoral zone of the Gulf of Riga, the Baltic Sea

2000 ◽  
Vol 35 (4) ◽  
pp. 373-385 ◽  
Author(s):  
S. Vilbaste ◽  
K. Sundbäck ◽  
C. Nilsson ◽  
J. Truu
Keyword(s):  
Baltic Sea ◽  
Littoral Zone ◽  
Benthic Diatoms ◽  
The Baltic Sea ◽  
Gulf Of Riga ◽  
The Baltic

scholarly journals Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts

2012 ◽  
Vol 69 (9) ◽  
pp. 1574-1579 ◽  
Author(s):  
Samu Mäntyniemi ◽  
Atso Romakkaniemi ◽  
Johan Dannewitz ◽  
Stefan Palm ◽  
Tapani Pakarinen ◽  
...  
Keyword(s):  
Baltic Sea ◽  
Clupea Harengus ◽  
Coefficient Of Determination ◽  
Migration Route ◽  
Grey Seal ◽  
Explanatory Variables ◽  
Direct Observations ◽  
The Baltic ◽  
Bothnian Bay ◽  
Bothnian Sea

Abstract Mäntyniemi, S., Romakkaniemi, A., Dannewitz, J., Palm, S., Pakarinen, T., Pulkkinen, H., Gårdmark, A., and Karlsson, O. 2012. Both predation and feeding opportunities may explain changes in survival of Baltic salmon post-smolts. – ICES Journal of Marine Science, 69: 1574–1579. The survival of wild and hatchery-reared post-smolts of salmon (Salmo salar) in the Baltic Sea has declined since the 1990s. Direct observations of the processes affecting survival are, however, lacking. Here, the importance of food availability and predation in regulating post-smolt survival is analysed. Based on previous studies, the following explanatory variables were selected: (i) availability of herring (Clupea harengus membras) recruits in the Gulf of Bothnia (Bothnian Sea, Bothnian Bay) in the northern Baltic Sea; (ii) sprat (Sprattus sprattus balticus) and herring abundance in the southern Baltic Sea; and (iii) abundance of grey seal (Halichoerus grypus) along the post-smolt migration route. Bayesian analysis was used to estimate the relative probability of each of the 32 combinations of these variables and revealed that the model including grey seal abundance and herring recruits per post-smolt had the highest posterior probability and a high coefficient of determination. The results suggest that the declining trend in post-smolt survival is explained by the increased number of grey seals, whereas the annual variation in survival coincides with variation in the recruitment of Bothnian Sea herring. However, it remains uncertain whether the observed correlations arise from direct causalities or other mechanisms.

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