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Study of the growth,reproductive biology and abundance for invasive shrimps palaemon elegans Rathke from Garmat Ali river Basrah,Southern Iraq

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Journal of Coastal Life Medicine 2016年第7期4卷 536-540页

作者： Khaled Khasaf Al-Khafaji Imad Hadi Al Qarooni Murtatha Youssef Al Abbad Nada Moffed Abd Al-Lateef Marine Biology Department Marine Science CentreUniversity of BasrahBasrahIraq Biology Department Education College for Pure SciencesUniversity of BasrahBasrahIraq

Objective:To describe the growth,reproductive biology and abundance of the population of invasive shrimps palaemon elegans(***)in one of the branches of Garmat Ali river at Basrah,Southern ***:Monthly samples of the prawn *** were collected with a bottom hand net(40 cm,0.5 mm mesh)hauled over a distance of 10 m.A simple random sampling was conducted monthly between December 2012 and November ***:Seasonal changes were observed in the composition of the population of the species during the study year with the highest abundance in 2013 and the lowest abundance for the males was reported in January and for the females occurred in *** showed a significant correlation with the abundance of shrimps at the sampling *** largest female measured 67.90 mm while the corresponding value for males was 61.31 *** proportion of ovigerous adults rose during spring season to peak on about July and ovigerous prawns were taken in all months of the *** sex ratio indicated a preponderance of females over males in all months in the study *** females produced around 36-1324 eggs and the incubation period lasted for 11-14 days at 17-29°***:The results of the present study indicate that this species has a wide distribution range,high density,and great reproduction *** study reveals the lack of researches on this species in environments of Shatt Al-Arab river and its ***,*** has most likely formed a permanent population in all the brackish waters in Basrah area.

关键词： palaemon elegans Reproductive biology Density Population structure Sex ratio Fecundity

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