Reproductive biology of Astyanax lacustris (Characiformes: Characidae) in the southern Pantanal floodplain, upper Paraguay River basin, Brazil

We studied the reproductive biology of Astyanax lacustris in the southern Pantanal, Brazil. A total of 382 fish were analyzed from February 2009 to January 2011. The sex ratio differed significantly from 1:1, with a larger proportion of females (χ 2  = 27.24; p  < 0.001). Females achieve higher s...

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Published inEnvironmental biology of fishes Vol. 100; no. 7; pp. 775 - 783
Main Authors Súarez, Yzel R., Silva, Edileia A., Viana, Lucilene F.
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.07.2017
Springer Nature B.V
Subjects
Allometry
Animal morphology
Animal Systematics/Taxonomy/Biogeography
Astyanax
Astyanax lacustris
Biology
Biomedical and Life Sciences
Biometry
Brazil
Characidae
Characiformes
Correlation
Environment
Fecundity
Females
Fish
Floodplains
Freshwater & Marine Ecology
Growth
History
Length
Life history
Life Sciences
Males
Maturation
Nature Conservation
Pantanal
Paraguay River
Rainy season
Reproductive behavior
River basins
Seasonal variation
Seasonal variations
Seasons
Sex
Sex ratio
Sexual maturity
temperature
watersheds
Wet season
Zoology
Brazil
Brazil, Paraguay River
Paraguay River
Pantanal
First maturation
Spawn type
Reproductive period
Gonadosomatic index
Fecundity
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Summary:We studied the reproductive biology of Astyanax lacustris in the southern Pantanal, Brazil. A total of 382 fish were analyzed from February 2009 to January 2011. The sex ratio differed significantly from 1:1, with a larger proportion of females (χ 2  = 27.24; p  < 0.001). Females achieve higher standard length than males (mean 72.30 mm and 56.51 mm, respectively), and possess negative allometric growth while males have positive allometric growth. Size at first maturation did not differ between sexes. The greatest reproductive activity occurred during the rainy season, when temperatures were highest (November to February). Total fecundity was significantly correlated with standard length (r s  = 0.74; p  = 0.01), and spawn type was total. Then, the life history traits of A. lacustris are adjusted to seasonal variation in the Southern Pantanal.
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ISSN:0378-1909
1573-5133
DOI:10.1007/s10641-017-0604-3