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The effect of oocytic atresia on fecundity estimates of the rabbit fish Siganus sutor (Pisces: Siganidae) of Kenyan marine inshore waters
Ntiba, M.J.; Jaccarini, V. (1992). The effect of oocytic atresia on fecundity estimates of the rabbit fish Siganus sutor (Pisces: Siganidae) of Kenyan marine inshore waters. Hydrobiologia 247: 215-222
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Peer reviewed article  

Also published as
  • Ntiba, M.J.; Jaccarini, V. (1992). The effect of oocytic atresia on fecundity estimates of the rabbit fish Siganus sutor (Pisces: Siganidae) of Kenyan marine inshore waters, in: Jaccarini, V. et al. (Ed.) The Ecology of Mangrove and Related Ecosystems: Proceedings of the International Symposium held at Mombasa, Kenya, 24-30 September 1990. Developments in Hydrobiology, 80: pp. 215-222, more

Available in Authors 
Document type: Conference paper

Keyword
    Brackish water

Authors  Top 
  • Ntiba, M.J.
  • Jaccarini, V.

Abstract
    In the strongly group-synchronized oocyte development of Siganus sutor (Valenciennes, 1835) the group of oocytes to be released in the following spawning, is identified. The smallest size of oocyte belonging to this group was identified by the presence of cytoplasmic vacuoles in oocytes in histological sections. These vacuolated oocytes corresponded to oocytes of 150 µm diameter obtained by treatment with Gilson's fixative. The mean number of such oocytes in stage 4 (late developing) ovaries was found to be 638000. The proportion of these oocytes removed by atresia before spawning was determined on histological sections to be 5% .The corrected estimate of mean fecundity was thus 606000 oocytes per spawning.

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