Revista de Investigación y Desarrollo Pesquero 2016 Nro 29

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Browsing Revista de Investigación y Desarrollo Pesquero 2016 Nro 29 by Author "Grosman, Fabián"

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    Características limnológicas, ictiofauna y abundancia de Odontesthes bonariensis de 35 lagunas de la región pampeana (Argentina)
    (Instituto Nacional de Investigación y Desarrollo Pesquero, 2016) Mancini, Miguel; Grosman, Fabián; Sanzano, Pablo; Del Ponti, Omar; Salinas, Víctor
    In the shallow lakes of the Pampean region (Argentina), that have different limnological characteristics and are the habitat of a wide variety of fish, silverside Odontesthes bonariensis shows the greatest sport and commercial interest. Although those water bodies were categorized as clear or turbid, their open or closed condition has received little attention. It has been suggested that the connection between those environments favours displacement of fish and colonization of new ecosystems. The objectives of this work were to evaluate certain limnological characteristics, the diversity of ichthyofauna, catch per unit effort in number (CPUEn) and biomass (CPUEb) of O. bonariensis in 35 Pampean shallow lakes and examine their degree of association and differences according to the condition of open or closed. Of the 22 fish species identified, O. bonariensis and Oligosarcus jenynsii were the most frequent with richness ranging 1-14 species. Water conductivity and the CPUEn and CPUEb of O. bonariensis showed wide variations. It was determined that the geographic location influences ichthyofauna composition. Up to 8,000 µS cm-1the open/closed condition has a greater effect on fish richness and diversity than water conductivity. In open shallow lakes, the conductivity was correlated with the CPUEn of O. bonariensis. Although they are inhabited by a larger diversity of species, O. bonariensis is the most frequent in both types of aquatic environments.