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.
Highlights
The Upper Paraguay Basin has a diversified and relatively well-preserved ichthyofauna, mainly in the Pantanal floodplains that present differences in flood pulse dynamics among subregions and along longitudinal gradient
Temporal variation in the number of sampled individuals was measured by a non-standard method
This parameter was still difficult to calculate in months with a higher river level, suggesting that the increase in river level leads to a reduction in sampled individuals
Summary
The Upper Paraguay Basin has a diversified and relatively well-preserved ichthyofauna, mainly in the Pantanal floodplains that present differences in flood pulse dynamics among subregions and along longitudinal gradient. Little information is available about biological traits in the context of adjustment to seasonal variations in the Pantanal (Junk et al, 1989; Alho and Sabino, 2011). 326 326/334 floodplain river systems (Junk et al, 1989) This means that the increase of river level would allow for the expansion of aquatic habitats and offer resources otherwise unavailable before such increase. These conditions would increase recruitment success (Junk et al, 1989; Freitas et al, 2015). For Hypoptopoma, 15 species are valid (Fricke et al, 2019) with seven (46.7%) described
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