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).

Petereit, Christoph, Hinrichsen, Hans-Harald, Voss, Rüdiger, Kraus, G., Freese, Marko and Clemmesen, Catriona (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). Open Access Scientia Marina, 73 (S1). pp. 59-72. DOI 10.3989/scimar.2009.73s1059.

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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

Document Type: Article
Keywords: Ichthyology; clupeids; vertical distribution; specific gravity; drift; recruitment; spawning stock; adult fish; ALKOR; AL297; AL299; AL318; AL329
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
OceanRep > The Future Ocean - Cluster of Excellence
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.3989/scimar.2009.73s1059
ISSN: 0214-8358
Projects: Future Ocean
Expeditions/Models/Experiments:
Date Deposited: 25 Nov 2009 13:36
Last Modified: 08 Sep 2016 07:24
URI: http://oceanrep.geomar.de/id/eprint/3367

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