Reproduction of Hypoptopoma inexspectatum (Holmberg, 1893) (Siluriformes, Loricariidae) in the Southern Pantanal Floodplain, Upper Paraguay River Basin, Brazil

• Main Author: Pereira,M. J.
• Publication Date: 2021
• Other Authors: Viana,L. F., Sais,M. H. B., Súarez,Y. R.
• Format: Article
• Language: eng
• Source: Brazilian Journal of Biology
• Download full: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842021000200326
• topic: size at first maturation; gonadosomatic index; reproductive period; spawn type

Abstract This work aimed to describe the reproductive biology of Hypoptopoma inexspectatum in southern Pantanal. A total of 538 individuals were sampled and analyzed from February 2009 through January 2011 in southern Pantanal. We did not observe differences in sex-ratio, and both sexes presented positive allometric length/weight relationship (LWR). Reproduction occurs mainly from January to February. Females reached first maturation (L50) with 37.80 mm and males with 45.80 mm. Absolute fecundity is estimated in mean=177.43 (sd±127.06) oocytes and relative fecundity in 3.12 (sd±2.23) oocytes/mg. Fecundity is positively correlated with standard length (Spearman r= 0.43; p=0.013), and total spawning is a used spawning strategy for H. inexspectatum.