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Deposition of egg capsule and larval development of Rapana venosa (Gastropoda: Muricidae) from the south-eastern Black Sea

Published online by Cambridge University Press:  30 July 2007

H. Saglam  and
E. Duzgunes
H. Saglam
Affiliation:
Central Fisheries Research Institute, Sana, 61100, Trabzon, Turkey
E. Duzgunes
Affiliation:
Karadeniz Technical University, Faculty of Marine Science, Çamburnu 61530, Trabzon, Turkey
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Abstract

Egg capsules and intracapsular embryos of Rapana venosa were studied to determine the reproductive pattern of this invader species in the south-eastern Black Sea. Egg deposition of R. venosa in the laboratory at 25°C was described. Egg laying began in mid-June, reached a peak in July and ended in late August in 1996. The total number of the egg capsules per whelk ranged between 197 and 999 (mean 575 ±41). The mean length of the egg capsules was 13.26 mm. Each capsule contained between 124 and 1090 embryos with a mean of 555 ±10. Mean larval production per rapa whelk was about 392,931 ±42,731. The mean size of eggs produced was 213.8 μm. Five different stages of intracapsular development were observed. Embryos developed without nurse eggs. Veliger larvae completed their intracapsular development and hatched in 22 days at 25°C.

Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 87 , Issue 4 , August 2007 , pp. 953 - 957
Copyright
2007 Marine Biological Association of the United Kingdom

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