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Reproductive biology of the highly commercial polychaetes in the Suez Canal

Published online by Cambridge University Press:  12 February 2010

Inas H. Osman*
Affiliation:
Department of Marine Sciences, Faculty of Sciences, Suez Canal University, Ismailia, Egypt
Howaida R. Gabr
Affiliation:
Department of Marine Sciences, Faculty of Sciences, Suez Canal University, Ismailia, Egypt
Hidetoshi Saito
Affiliation:
Faculty of Applied Biological Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8528, Japan
Salah Gh. El-Etreby
Affiliation:
Department of Marine Sciences, Faculty of Sciences, Suez Canal University, Ismailia, Egypt
*
Correspondence should be addressed to: I.H. Osman, Department of Marine Sciences, Faculty of Sciences, Suez Canal University, Ismailia, Egypt email: [email protected]

Abstract

The reproductive biology of the commercial seabait polychaete species Perinereis nuntia brevicirris, Lumbrineris funchalensis and Halla parthenopeia was investigated from samples obtained from the Suez Canal, Egypt, to determine sex-ratio, reproductive maturity stages, spawning season, and fecundity. Samples were collected monthly from January 2002 to February 2003. The results of sex-ratio indicated that males of the three studied worms outnumbered females through the whole study period. Based upon histological features of the coelomic contents, four maturity stages were described in females of P. nuntia brevicirris, three stages were described for females of L. funchalensis and three stages for females of H. parthenopeia. The spawning season of P. nuntia brevicirris was found to take place during spring and L. funchalensis does not have a defined breeding season, while H. parthenopeia has two reproductive periods, one in May and the second in November and lasted to January. Fecundity was estimated by counting the number of oocytes per each female—it showed that P. nuntia brevicirris is more fecund (mean = 208.358 ±2080 oocyte/female) than L. fanchalensis and H. parthenopeia (mean = 2660 ±654 and 142,068 ±2005 oocyte/female respectively). This study is the first to document aspects of the reproductive biology of the highly commercial polychaetes in the Suez Canal and adds to our knowledge for understanding their reproductive patterns and strategies.

Type
Research Article
Copyright
Copyright © Marine Biological Association of the United Kingdom 2010

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