Spatial and interannual variability in Baltic sprat batch fecundity.

Haslob, Holger, Tomkiewicz, Jonna, Hinrichsen, Hans-Harald and Kraus, G. (2011) Spatial and interannual variability in Baltic sprat batch fecundity. Fisheries Research, 110 (2). pp. 289-297. DOI 10.1016/j.fishres.2011.04.018.

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Abstract

Absolute and relative batch fecundity of Baltic sprat (Sprattus sprattus balticus S.) during peak spawning time was investigated for several years over the last two decades by applying the hydrated oocyte method. Batch fecundity was analysed for three important spawning areas of sprat in the central Baltic Sea, namely the Bornholm Basin, Gdansk Deep and Southern Gotland Basin. Environmental parameters such as hydrography, fish condition and stock density were tested in order to investigate the observed previous termvariabilitynext term in sprat fecundity. Absolute batch fecundity was found to be positively related to fish length and weight. Significant differences in absolute and relative batch fecundity of Baltic sprat among areas and years were detected, and could partly be explained by hydrographic features of the investigated areas. A non-linear multiple regression model taking into account fish length and ambient temperature explained 70% of previous termvariabilitynext term in absolute batch fecundity. Oxygen content and fish condition were not related to sprat batch fecundity. Additionally, a negative effect of stock size on sprat batch fecundity in the Bornholm Basin was revealed. The obtained data and results are important to assess the stock reproductive potential of this important Baltic fish stock.
Highlights
► Batch fecundity in Baltic sprat varies among areas and years. ► previous termVariabilitynext term in batch fecundity is related to ambient temperature and stock size. ► Valuable data to evaluate the stock reproductive potential of an important species are provided.

Document Type: Article
Keywords: Evolutionary Ecology of Marine Fishes; Ichthyology; Batch fecundity; Sprat; Hydrated oocyte method; Baltic Sea; Alkor; Walther Herwig; AL15B;
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.fishres.2011.04.018
ISSN: 0165-7836
Expeditions/Models/Experiments:
Date Deposited: 02 Dec 2011 14:55
Last Modified: 09 Jan 2017 14:02
URI: http://oceanrep.geomar.de/id/eprint/12719

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