The dynamics of postovulatory follicle degeneration and oocyte growth in Baltic sprat.

Haslob, Holger, Kraus, G. and Saborido-Rey, F. (2012) The dynamics of postovulatory follicle degeneration and oocyte growth in Baltic sprat. Journal of Sea Research, 67 (1). pp. 27-33. DOI 10.1016/j.seares.2011.09.001.

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Ovaries of Baltic sprat (Sprattus sprattus balticus S.) were analysed histologically to identify stages of postovulatory follicles (POF) and to assess the oocyte development pattern. Samples were taken every 3 h during a 24 h trawl survey conducted in the Bornholm Basin in April 2007. Gonad histology revealed spawning of sprat throughout the day which hampered the exact ageing of POFs by the postovulatory follicle method and therefore did not allow direct estimation of spawning frequency. However, it was possible to define four stages of POFs, according to their histological features. The occurrence of these POF stages (I to IV) corresponded clearly to the development of the leading oocyte cohort. Further, the oocyte recruitment pattern revealed that the spawning batch can be identified prior to hydration. The POF stages I and II were present almost exclusively in vitellogenic ovaries, POF III were found in ovaries in the germinal vesicle stage, and the most deteriorated POF stage IV was found in actively spawning fish with hydrated oocytes. Since POF were absent only in very few ovaries (5%), and in each ovary in general only one POF stage was present, the duration of POF degeneration approximately equals the average batch interval, i.e. the time lag between subsequent spawning events. The results of the present study will serve as basis for future studies on Baltic sprat oocyte recruitment and daily spawning fraction.
► Histological classification of sprat gonad development stages. ► Histological classification of POF in sprat in relation to gonad developmental stages. ► Daily spawning pattern of Baltic sprat.

Document Type: Article
Keywords: Evolutionary Ecology of Marine Fishes; Oocyte Recruitment; Postovulatory Follicles; Sprattus sprattus; Spawning Traits; AL297; ALKOR
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EV Marine Evolutionary Ecology
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1016/j.seares.2011.09.001
ISSN: 1385-1101
Date Deposited: 31 Oct 2011 13:38
Last Modified: 19 Jul 2017 10:38

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