.
Abstract
Biological and ecological aspects of Palaemonetes argentinus (Nobili, 1901) (Crustacea, Decapoda, Palaemonidae), in the Felizardo arroyo, medium Uruguai River, Uruguaiana, Rio Grande do Sul, Brazil. This work presents aspects of density, biomass, reproduction and growth of Palaemonetes argentinus. Captures were made seasonally in the period between July 2001 and May 2002, in three distinct spots of the Felizardo stream, an affluent of the medium Uruguai River, through the electric fishing technique. The results obtained refer to the four seasons of the year, throughout which a total of 551 individuals were captured out of an expected 604. The period of higher density and biomass was the Spring season with 5,982 ind./ha and 2,057 g/ha, respectively. The weight-length relation obtained for the P argentinus population was Wt = 0.145252 * L 2.679 . The fecundity (NO) length relation obtained for the same population was NO = exp. (1.64908 + 0.528255) * Lt and the fecundity (NO) weight relation was Wt = exp. (-1.95674 + 0.0311) * NO. The curve determined for the growth in length of Palaemonetes argentinus indicated Lt = 5.7 (1- e -0.373082 (T - 0.400498) ) and Wt = 1.608 (1- e -0.172389 (W - 1.052659) ). The reproductive period occurs with greater intensity in the spring and proceeds in a reduced manner in summer, having a rest period in the autumn and winter. The number of eggs in the spawnings varied between 18 and 84, with an average of 39.88 eggs per egged female.Downloads
Published
Issue
Section
License
Copyright (c) 2004 Claudia Lisiane de Oliveira Azevedo, Edward Frederico Castro Pessano, Diego Seiguer Tomassoni, Marcus Vinicius Morini Querol, Enrique Querol
This work is licensed under a Creative Commons Attribution 4.0 International License.
After the electronic publication of the manuscript, the authors are entitled, without any restriction, on its contents.
License Creative Commons Atribuição 4.0 Internacional - CC BY
Authors are able to take on additional contracts separately, non-exclusive distribution of the version of the paper published in this journal (ex.: publish in institutional repository or as a book), with an acknowledgment of its initial publication in this journal.