Recruitment of Baltic cod and sprat stocks: identification of critical life stages and incorporation of environmental variability into stock-recruitment relationships*
By F. Köster, H. Hinrichsen, D. Schnack, M. John, B. MacKenzie, J. Tomkiewicz, C. Möllmann, G. Kraus, M. Plikshs, A. Makarchouk and 1 more. 2003
183 citations recorded by the source corpus.
The recruitment processes of Baltic cod and sprat were analysed and critical periods were identified by addressing the major impact factors on individual early life history stages separately and relating observed abundance data between successive stages. For cod, recruitment appeared to be dependent on egg survival, with low oxygen concentration in dwelling depths and predation by clupeids as the major causes for egg mortality. Surviving egg production and larval abundance were weakly correlated, whereas larval abundance was significantly related to year class strength. This indicated that the period between the late egg and the early larval stage is critical for cod recruitment. A potential variable identified to affect this life stage was prey availability for larvae. For sprat, early and late egg stage production as well as late egg stage production and larval abundance were significantly related. However, year class strength was largely independent of larval abundance. Thus, the period between the late larval and early juvenile stage appeared to be critical for sprat recruitment. Potential variables identified to affect this life stage were ambient temperature and wind stress. Environmental factors showing statistically significant covariance with the survival of one of these critical life stages were incorporated into stock-recruitment models for individual spawning areas separately and for the Central Baltic combined.
Subfields: Food Science, Global and Planetary Change
View Paper: https://www.semanticscholar.org/paper/37dca4bf085806323e289f47e2a6682a596fa952
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In Global and Planetary Change
Citations in the corpus
- Egg and early larval stages of Baltic cod, Gadus morhua, are robust to high levels of ocean acidification (2013, background): “As the stock size of mass-spawning marine fish is determined by the recruitment of the young, the survival of the early egg and larval phases presents the bottleneck in the life history (Koester et al. 2003; Houde 2008).”
- Effect of ocean acidification on early life stages of Atlantic herring (Clupea harengus L.) (2011, background): “Since the recruitment of fish seems to be determined during the early life stages (Koester et al., 2003; Houde, 2008), knowledge of the factors influencing growth and survival rates of these stages are of great importance in fisheries science.”
- Impact of 21st century climate change on the Baltic Sea fish community and fisheries (2007, background): “Consequently, the present clupeid-dominated regime in the Central Baltic fish community (Köster et al., 2003b; Alheit et al., 2005) could become stabilized.”
- Baltic cod recruitment – the impact of climate variability on key processes (2005, background): “The eastern Baltic cod stock declined to its lowest stock size on record in 1992 owing to a reduction in reproductive success in combination with increasing fishing pressure (Bagge et al., 1994; Köster et al., 2003b).”
- Emerging from Hjort's Shadow (2008, background): “In the Baltic Sea, recruitments of cod and sprat (Sprattus sprattus) are fixed in the egg-larval and late larval-juvenile stages, respectively (Köster et al., 2003).”
- Egg production of Baltic cod (Gadus morhua) in relation to variable sex ratio, maturity, and fecundity (2002, background): “Kraus (2002) observed a reduction of the annual potential cod egg production in the Bornholm Basin by atresia of 3.5% in 1999.”
- Small pelagic fish in the new millennium: A bottom-up view of global research effort (2020, background): “During the two periods reviewed here, a considerable amount of research was conducted on various life stages of both Atlantic herring and sprat including reviews of how bottom-up processes may impact on the recruitment dynamics of sprat (Köster et al., 2003; Voss et al., 2012),”