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Volume 42 - Number 3 - 2007
Artículo


Spatial distribution of the red shrimp (Pleoticus muelleri, (Bate, 1888)) and its relationship with the environmental variables, San Jorge Gulf, Argentina

Mónica Fernández1, Daniel Hernández1 y Ana Roux1

 

1Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP). Paseo Victoria Ocampo 1 B7602HSA, Mar del Plata, Argentina

 

E-mail: lango@inidep.edu.ar

 

The analysis of the distribution of shrimp concentrations in the south of the San Jorge Gulf is presented, as well as their relationship with the physico-chemical characteristics of the superficial sediments and the bottom water. Data analyzed was obtained from the Shrimp Project Research Cruise OB-05/03 carried out during June 2003. Biological variables analyzed were: juvenile, subadult and adult shrimp densities and size structure. Correspondence analyses were applied for numerical data treatment. The distribution of the different shrimp categories in the studied area shows a west-eastern pattern, being the juveniles towards the west coast and the adults larger than 41 mm carapace length towards the northeast, while the main concentrations of subadults and adults were found in the rest of the study area. A relationship between the spatial distribution of the juvenile and adult categories and depth and total organic carbon (TOC) was determined. The highest adult densities (> 41 mm carcass length) were related with the highest depths and the lowest values of TOC. While the highest juvenile densities were related with the lowest depths and the highest TOC concentrations


Key words: Shrimp fishery, Patagonia, spatial distribution, environmental variables


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1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
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