Reproduction of Baltic herring after dissimilar growth and overwintering seasons

Laine, Päivi; Eklund, Jan; Soikkeli, Martti

doi:10.1080/00785236.1998.10426963

Cited by 4 publications

(4 citation statements)

References 7 publications

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“…harengus females, reproduction takes place at the expense of somatic growth leading to a reduction in body size, and further to a reduced reproductive capacity, as the fecundity decreases with decreasing body size. In this study, only ovarian masses were considered, but if converted to egg numbers (Laine et al , ), a 6 year‐old female produced on average 33 400 eggs in a year of high total production ( e . g .…”

Section: Discussionmentioning

confidence: 99%

Female Baltic herring Clupea harengus allocate resources from growth to reproduction in poor feeding conditions

Rajasilta

Eklund

Hänninen

et al. 2015

Journal of Fish Biology

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The trade-off between somatic growth and reproduction in the female Baltic herring Clupea harengus was investigated from 1984 to 2002. During the study period, growth decreased, as a consequence of decreasing salinity and weakening of feeding conditions. Production of muscle and ovarian tissue decreased in repeat spawners, but investment in reproduction took an increasing amount of the total production of new tissues. This suggested that a shift in allocation to reproduction takes precedence over body growth in the reproductive strategy of C. harengus. The process also indicated one possible mechanism leading to dwarf forms in fish populations.

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Section: Discussionmentioning

confidence: 99%

Female Baltic herring Clupea harengus allocate resources from growth to reproduction in poor feeding conditions

Rajasilta

Eklund

Hänninen

et al. 2015

Journal of Fish Biology

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“…In this shifting ecological scenario, the growth and condition of sprat and herring (Clupea harengus), which are the main pelagic fish species in the Baltic Sea, has also experienced remarkable changes (Cardinale and Arrhenius 2000;Cardinale et al 2002;ICES 2009). These changes have important implications not only for fish population dynamics, e.g., fecundity and reproductive potential (Laine et al 1998;Laine and Rajasilta 1999;Cardinale et al 2009), but also for predictions and thus management of the Baltic fisheries (ICES 2008a).…”

Section: Introductionmentioning

confidence: 99%

Spatial and temporal density dependence regulates the condition of central Baltic Sea clupeids: compelling evidence using an extensive international acoustic survey

et al. 2011

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For the first time an international acoustic survey dataset covering three decades was used to investigate the factors shaping the spatial and temporal patterns in the condition of sprat and herring in the Baltic Proper. Generalized additive models showed that the spatial and temporal fluctuations in sprat density have been the main drivers of the spatio-temporal changes of both sprat and herring condition, evidencing intra- and inter-specific density dependence mediated by the size and distribution of the sprat population. Salinity was also an important predictor of herring condition, whereas temperature explained only a minor part of sprat model deviance. Herring density was an additional albeit weak significant predictor for herring condition, evidencing also intra-specific density dependence within the herring population. For both species, condition was high and similar in all areas of the Baltic Proper until the early 1990s, coincident with low sprat densities. Afterwards, a drop in condition occurred and a clear south-north pattern emerged. The drop in condition after the early 1990s was stronger in the northern areas, where sprat population increased the most. We suggest that the increase in sprat density in the northern areas, and the consequent spatial differentiation in clupeid condition, have been triggered by the almost total disappearance of the predator cod from the northern Baltic Proper. This study provides a step forward in understanding clupeid condition in the Baltic Sea, presenting evidence that density-dependent mechanisms also operate at the spatial scale within stock units. This stresses the importance of spatio-temporal considerations in the management of exploited fish

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“…To predict recruitment of Baltic Sea herring shortly after spawning, we compared data on year-class strength (YCS) of age 2 herring with young-of-the-year herring densities (YOY) and herring spawning stock biomass (SSB, fish age Ն 3 yr). Because mild winters can positively affect yearclass strength (e.g., Brielmann 1989;Rajasilta et al 1996;Laine et al 1998), we also included climate data (the North Atlantic Oscillation index, NAO) in our analysis.…”

mentioning

confidence: 99%

“…Because mild winters can positively affect yearclass strength (e.g., Brielmann 1989;Rajasilta et al 1996;Laine et al 1998), we also included climate data (the North Atlantic Oscillation index, NAO) in our analysis.…”

mentioning

confidence: 99%

Predicting herring recruitment from young‐of‐the‐year densities, spawning stock biomass, and climate

Axenrot

Hansson

2003

Limnology & Oceanography

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Because fish are key organisms in most aquatic ecosystems, we seek to understand what determines their highly variable reproductive success. From our work, it appears that yearclass strength of Baltic Sea herring (Clupea harengus L.) can be predicted from young-of-the-year densities in a small coastal area (hydroacoustic data), a climate index (the North Atlantic Oscillation), and the spawning stock biomass. These three factors explained 93% of the variation in the number of age 2 herring during 1985-2000. By predicting year-class strength 3 yr before the fish enter the fishery, we provide managers with the opportunity to adjust fishing pressure per upcoming year classes and manage the fishery by multiannual catch quotas.

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Reproduction of Baltic herring after dissimilar growth and overwintering seasons

Cited by 4 publications

References 7 publications

Female Baltic herring Clupea harengus allocate resources from growth to reproduction in poor feeding conditions

Female Baltic herring Clupea harengus allocate resources from growth to reproduction in poor feeding conditions

Spatial and temporal density dependence regulates the condition of central Baltic Sea clupeids: compelling evidence using an extensive international acoustic survey

Predicting herring recruitment from young‐of‐the‐year densities, spawning stock biomass, and climate

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