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Reproductive strategy and spawning activity of sand flathead, Platycephalus bassensis.

Bani, A, Moltschaniwskyj, NA and Pankhurst, NW 2009 , 'Reproductive strategy and spawning activity of sand flathead, Platycephalus bassensis.' , Cybium , vol. 33, no. 2 , pp. 151-162 .

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The aim of this study was to describe and determine the reproductive and spawning strategy of the sand
flathead, Platycephalus bassensis Cuvier, 1829 based on histological analysis of ovary and testis. The presence of multiple
group synchronous gamete development in both sexes within a reproductive season confirmed the hypothesis that sand
flathead is a serial spawner and is reproductively active from October to March. Spawning frequency estimated from a
combination of information acquired from field sampling and results from a laboratory experiment, indicated that sand flathead
spawned on average once every 4-5.3 days during the spawning season. A clear pattern of diel periodicity in spawning
was apparent in sand flathead with the peak of spawning activity during the day. Results of this study showed that estimating
spawning periodicity from the presence, and age of postovulatory follicles is more reliable than using the presence of
hydrated oocytes. This study highlights the details of reproductive biology of a serial spawner and its potential for variability,
which can have implications for recruitment and adult population dynamics.

Item Type: Article
Authors/Creators:Bani, A and Moltschaniwskyj, NA and Pankhurst, NW
Keywords: Platycephalidae - Platycephalus bassensis - Australia - Tasmania - Gonad development - Atresia - Postovulatory follicle - Spawning periodicity.
Journal or Publication Title: Cybium
ISSN: 0399-0974
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Copyright © 2009 Société Française d’Ichtyologie

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