Diet composition and feeding activity of larval spring-spawning herring: Importance of environmental variability

Arula, Timo; Kotta, Jonne; Lankov, Ain; Simm, Mart; Põlme, Sergei

doi:10.1016/j.seares.2011.12.003

Cited by 32 publications

(30 citation statements)

References 28 publications

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“…G j -1 is a trawl index for juvenile and larval gobies (from here on: gobies) in Pärnu Bay proportional to the median of goby abundance determined by weekly Hensen trawls above the thermocline during May-July (Ojaveer et al 2011, Arula et al 2012. T j -1 refers to the average May-July air temperature in Pärnu during the year the recruits where spawned, while I j -1 is the ice duration in Pärnu Bay during their first winter; a, b, and c are model coefficients, while s() denotes nonparametric spline functions.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Challenges and Opportunities of Local Fisheries Management: Pikeperch, Sander Lucioperca (Actinopterygii: Perciformes: Percidae), in Pärnu Bay, Northern Gulf of Riga, Baltic Sea

Müller‐Karulis¹,

Arula²,

Balode³

et al. 2013

Acta Icth et Piscat

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Section: Methodsmentioning

confidence: 99%

“…The shallow bay (mean depth 5 m) covers about 700 km 2 and its salinity ranges from PSU 1 through 5 and references therein). The climate is rather continental, with ice covering the bay in winter and the water temperature rising to 24ºC in summer (Arula et al 2012). Pikeperch spawns on sandy bottoms in May and June (Erm et al 2003).…”

mentioning

confidence: 99%

Challenges and Opportunities of Local Fisheries Management: Pikeperch, Sander Lucioperca (Actinopterygii: Perciformes: Percidae), in Pärnu Bay, Northern Gulf of Riga, Baltic Sea

Müller‐Karulis¹,

Arula²,

Balode³

et al. 2013

Acta Icth et Piscat

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“…A Juday net (mouth opening of 0.1 m 2 , mesh size of 90 µm) was used to sample the whole water column vertically by pulling the net once from the seabed to the surface (see also [25][26][27]). The samples were immediately preserved in a 4% formaldehyde/seawater solution.…”

Section: Environmental Data and Samplingmentioning

confidence: 99%

“…The abundance of copepod nauplii-the first prey of larval smelt-increased substantially since 1982, improving the feeding conditions for smelt larvae [26]. The feeding condition hypothesis is further supported by the fact that the abundance of herring larvae-main potential food competitor of smelt larvaesignificantly decreased in the 1990s [19,[25][26][27]]. Since we found K to be significantly higher in 2012, compared to the former period, we assume that improved feeding conditions during the early stages of life had a notable effect on the early maturation of smelt.…”

Section: Feeding Conditionsmentioning

confidence: 99%

Maturation at a young age and small size of European smelt (Osmerus eperlanus): A consequence of population overexploitation or climate change?

et al. 2017

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Age of fish at maturation depends on the species and environmental factors but, in general, investment in growth is prioritized until the first sexual maturity, after which a considerable and increasing proportion of resources are used for reproduction. The present study summarizes for the first the key elements of the maturation of European smelt (Osmerus eperlanus) young of the year (YoY) in the North-eastern Gulf of Riga (the Baltic Sea). Prior to the changes in climatic conditions and collapse of smelt fishery in the 1990s in the Gulf of Riga, smelt attained sexual maturity at the age of 3-4 years. We found a substantial share (22%) of YoY smelt with maturing gonads after the collapse of the smelt fisheries. Maturing individuals had a significantly higher weight, length and condition factor than immature YOY, indicating the importance of individual growth rates in the maturation process. The proportion of maturing YoY individuals increased with fish size. We discuss the factors behind prioritizing reproduction overgrowth in early life and its implications for the smelt population dynamics.

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“…A new bottleneck may have been identified for spring spawning herring in form of temperatures exceeding the physiological thermal optimum for the survival of postflexion herring larvae in shallow estuarine habitats (Ojaveer et al 2011, Arula et al 2012a. Future climate warming indicates a risk for decreased survival of spring spawning larval herring, which may lead to reduced stocks of herring relying in recruitment in shallow coastal areas.…”

Section: Case Studies On the Importance Of Efhmentioning

confidence: 99%

Essential fish habitats (EFH)

Kraufvelin¹,

Pekcan‐Hekim²,

Bergström³

et al. 2016

TemaNord

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Essential fish habitats (EFH)Conclusions from a workshop on the importance, mapping, monitoring, threats and conservation of coastal EFH in the Baltic Sea Patrik Kraufvelin, Ulf Bergström, Annukka Lehikoinen, This publication has been published with financial support by the Nordic Council of Ministers. However, the contents of this publication do not necessarily reflect the views, policies or recommendations of the Nordic Council of Ministers. www.norden.org/nordpubNordic co-operation Nordic co-operation is one of the world's most extensive forms of regional collaboration, involving Denmark, Finland, Iceland, Norway, Sweden, and the Faroe Islands, Greenland, and Åland.Nordic co-operation has firm traditions in politics, the economy, and culture. It plays an important role in European and international collaboration, and aims at creating a strong Nordic community in a strong Europe.Nordic co-operation seeks to safeguard Nordic and regional interests and principles in the global community. Common Nordic values help the region solidify its position as one of the world's most innovative and competitive. Nordic Council of Ministers PrefaceMany coastal and offshore fish species in the Baltic Sea are strongly dependent on shallow and sheltered near-shore habitats for their spawning, nursery, feeding and migration. Still, the role of these essential fish habitats, EFH, for the development and support of fish stocks and communities has received relatively little attention. As EFH in the Baltic often are found in the same parts of the coastal zone that are highly utilized and valued by humans, they are subjected to many threats and therefore management needs are urgent. In addition, EFH provide and support important ecosystem services and are included in national and international agreements and legislative acts as the Baltic Sea Action Plan, Habitats Directive and Marine Strategy Framework Directive. Despite this, the conservation status of EFH is generally poor in the region. As a result of these shortcomings and needs, the Nordic Council of Ministers financed a project including a workshop with Baltic Sea experts with the aim to review the importance of, protection of and threats to coastal EFH in the Baltic Sea. This report describes the results of the project, primarily focusing on the outcome of the workshop. SummaryMany fish species in the Baltic Sea are highly dependent on shallow and sheltered coastal habitats that they use for spawning, nursery, feeding and migration. Still, the role of these essential fish habitats (EFH) for the development and support of fish stocks and communities has received relatively little attention, even though there is general consensus among scientists about their critical importance. Little is also known about the major threats to EFH, and their conservation status in different countries has previously not been reviewed. As EFH often are found in the same parts of the coastal zone that are also highly valued by humans, this gap in knowledge needs to be addressed. Hence, there is an...

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Diet composition and feeding activity of larval spring-spawning herring: Importance of environmental variability

Cited by 32 publications

References 28 publications

Challenges and Opportunities of Local Fisheries Management: Pikeperch, Sander Lucioperca (Actinopterygii: Perciformes: Percidae), in Pärnu Bay, Northern Gulf of Riga, Baltic Sea

Challenges and Opportunities of Local Fisheries Management: Pikeperch, Sander Lucioperca (Actinopterygii: Perciformes: Percidae), in Pärnu Bay, Northern Gulf of Riga, Baltic Sea

Maturation at a young age and small size of European smelt (Osmerus eperlanus): A consequence of population overexploitation or climate change?

Essential fish habitats (EFH)

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