Sexual seasonal growth variation and reproduction biology of the rock pool prawn, &lt;em&gt;Palaemon elegans&lt;/em&gt; (Decapoda: Palaemonidae) in the southern Black Sea

Ozcan Ozen,Osman Samsun,Sabri Bilgin

doi:10.3989/scimar.2009.73n2239

Abstract

The seasonal growth pattern and reproductive biology of the rock pool prawn, Palaemon elegans , were studied in the southern Black Sea between February 2002 and January 2004. The seasonal von Bertalanffy growth parameters, computed from monthly length frequency distributions, were estimated as L ∞ = 47.8 mm total length (TL), K = 1. 115 year -1 for females and as L ∞ = 41.1 mm TL, K = 1.654 year -1 for males. The seasonal oscillation in growth rate for females (C = 0.904) was larger than it was for males (C = 0.586). The slowest period of growth corresponded to June in females and February in males. The size at sexual maturity for females (TL 50 ) was estimated as 33.8 mm TL. Ovigerous females were recorded from March to August and juveniles appeared in the benthic population in August. The ovarian development of the rock pool prawn was most probably initiated by photoperiod, whereas embryo development was accelerated with increasing water temperatures.

Highlights

The rock pool prawn, Palaemon elegans Rathke, 1837, is distributed along the North Sea, Baltic Sea, eastern Atlantic, Mediterranean, and Black Sea (Udekem d’Acoz, 1999; Janas et al, 2004)
The ovarian development of the rock pool prawn was most probably initiated by photoperiod, whereas embryo development was accelerated with increasing water temperatures
Our results showed that seasonal growth oscillation of P. elegans was more pronounced in females

Summary

Introduction

The rock pool prawn, Palaemon elegans Rathke, 1837, is distributed along the North Sea, Baltic Sea, eastern Atlantic, Mediterranean, and Black Sea (Udekem d’Acoz, 1999; Janas et al, 2004). It inhabits bottoms covered with Zostera marina meadows, bare sandy bottoms, in moving waters and in rock pools (Berglund, 1980). It shows sexual dimorphism and females grow up to 50 mm, whereas males reach a size of about 45 mm (Forster, 1951; Berglund, 1981; Lapinska and Szaniawska, 2006). The reproduction biology of P. elegans has been investigated in terms of egg characteristics (Berglund, 1984), fecundity (Sanz, 1987; Bilgin and Samsun, 2006), and reproductive success (Berglund, 1985)

Objectives

Methods

Results

Discussion

Conclusion