Preliminary Study Of The Population Structure And Allometry Of The Introduced Shrimp Palaemon macrodactylus In The Salado River, Argentina

BONEL NICOLAS; ALDA MARIA DEL PILAR; MARTORELLI SERGIO R

Menphis

Conferencia; Aquaculture 2013; 2013

world Aquaculture Society WAS

The invasive oriental shrimp Palaemon macrodactylus was first reported in Argentina in 2006 and has expanded its distributional range along the Argentina Atlantic coast. The knowledge of their ecology and biology, however, is still inchoate. The main goal of This study was to analyze the size structure and allometry of P. macrodactylus from the Salado River, Argentina. We collected a total of 113 individuals in March and December 2011 and in May 2012 from the lower basin of the Salado River. The sex was determined by the presence of the appendix masculine and we classified females as nonovigerous and ovigerous based on the presence of eggs. We measured the carapace length (CL) and weigh all specimens (the eggs of ovigerous females were remove before weigh). The size distribution was constructed using CL measurements. We estimated the allometric relationof wet weight (WW) as function of CL. The size at 50% sexual maturity (CLm) of ovigerous females was calcuusing a logistic equation. Ovigerous females showed larger CL (20.7mm) than nonovigerous females (15.2mm) and males (12.7mm); males were shorter than both female stages (P