Reproductive ecology of Baltic sprat and its application in stock assessment [Elektronische Ressource] / vorgelegt von Holger Haslob

Reproductive ecology of Baltic sprat and its application in stock assessment Dissertation zur Erlangung des Doktorgrades der Mathematisch-Naturwissenschaftlichen Fakultät der Christian-Albrechts-Universität zu Kiel vorgelegt von Holger Haslob Kiel, Februar 2011 Referent: Prof. Dietrich Schnack Ko-Referent: Prof. Myron A. Peck Datum der mündlichen Prüfung: 24.03.2011 Zum Druck genehmigt: 24.03.2011 Table of contents _____________________________________________________________________________ Zusammenfassung ..................................................................................................... 1 Summary ................... 2 Introduction ............................................................................................................... 3 Baltic Sprat .................................. 3 The Assessment of the Baltic Sprat Stock ................... 6 Spawning traits of Baltic Sprat .................................................................... 6 The Daily Egg Production Method .............................. 7 Aim of the present study .............................................................................................................. 8 Chapter I: Spatial and interannual variability in Baltic sprat batch fecundity ........ 11 Chapter II: Seasonal variability of sprat spawning traits ........