Scientia Marina, Vol 73, No S1 (2009)

The influence of different salinity conditions on egg buoyancy and development and yolk sac larval survival and morphometric traits of Baltic Sea sprat (Sprattus sprattus balticus Schneider)


https://doi.org/10.3989/scimar.2009.73s1059

Christoph Petereit
Leibniz Institute of Marine Sciences (IFM-GEOMAR), Germany

Hans Harald Hinrichsen
Leibniz Institute of Marine Sciences (IFM-GEOMAR), Germany

Rüdiger Voss
Sustainable Fisheries, Department of Economics, University of Kiel, Germany

Gerd Kraus
Institute of Sea Fisheries, Johann Heinrich von Thünen-Institut, Federal Research Institute for Rural Areas, Germany

Marko Freese
Leibniz Institute of Marine Sciences (IFM-GEOMAR), Germany

Catriona Clemmesen
Leibniz Institute of Marine Sciences (IFM-GEOMAR), Germany

Abstract


The small pelagic sprat (Sprattus sprattus) is a key ecologic player in the Baltic Sea. However, there is long-term variability in recruitment which is thought to be influenced by fluctuations in abiotic and biotic conditions experienced during the early life stages. This study concentrates on the influence of different ambient salinities on sprat egg development, egg buoyancy and survival as well as early yolk sac larval morphometric traits. Egg buoyancy significantly decreased with increasing salinity experienced during fertilization and/or incubation experiments. Field egg buoyancy measurements in 2007 and 2008 exhibited annual and seasonal differences in specific gravity, potentially associated with changes in adult sprat vertical distribution. Neither egg development time nor the duration of the yolk sac phase differed among salinity treatments. At eye pigmentation, larval standard length exhibited high variance among individuals but did not differ among treatments. The largest ecological impact of salinity experienced during spawning was the modification the buoyancy of eggs and yolk sac larvae, which determines their vertical habitat in the Baltic Sea. There are strong thermo- and oxyclines in the Baltic Sea, and thus salinity can indirectly impact the survival of these early life stages by modifying the ambient temperatures and oxygen conditions experienced.

Keywords


clupeids; vertical distribution; specific gravity; drift; recruitment; spawning stock; adult fish

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