Reproductive ecology of Baltic sprat and its application in stock assessment.

Haslob, Holger (2011) Reproductive ecology of Baltic sprat and its application in stock assessment. (PhD/ Doctoral thesis), Christian-Albrechts-Universität, Kiel, Germany, 133 pp.

[thumbnail of diss_haslob.pdf]
Preview
Text
diss_haslob.pdf - Published Version

Download (10MB)

Abstract

Sprat is an important ecological key species in the Baltic Sea. Temporal and spatial variability in reproductive traits of Baltic sprat was investigated in relation to biotic and abiotic parameters. The seasonality of important spawning traits were analysed. Models of sex ratio and maturity at length were established. The ovarian dynamics in relation to postovulatory follicles (POF) were described with the major finding that the degeneration of POF equals the spawning interval. A temperature dependent model on Baltic sprat egg development was established. All obtained results were finally used to implement the Daily Egg Production Method (DEPM) to the Baltic sprat stock. The knowledge obtained by the present thesis will serve as basis to (i) enhance existing assessment methods and to test alternative indices for sprat stock reproductive potential, (ii) implement alternative assessment methods and (iii) further investigate the population dynamics and ecology of Baltic sprat.

Document Type: Thesis (PhD/ Doctoral thesis)
Additional Information: Referent: Prof. Dietrich Schnack Ko-Referent: Prof. Myron A. Peck
Keywords: Ichthyology; stock reproductive potential, daily egg production method, sprat, batch fecundity, maturity
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Date Deposited: 15 Sep 2011 12:15
Last Modified: 06 Jul 2012 15:09
URI: https://oceanrep.geomar.de/id/eprint/12150

Actions (login required)

View Item View Item