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Otolith morphometry provides length and weight predictions and insights about capture sites of Prochilodus lineatus (Characiformes: Prochilodontidae) Neotropical Ichthyology
Santana,Herick Soares de; Rodrigues,Amanda Cantarute; Minte-Vera,Carolina Viviana.
ABSTRACT Here we choose the sábalo Prochilodus lineatus, to answer the following questions: How the otolith length and weight are correlated to fish measurements (length and weight)? How reliable are the otoliths measurements to predict the length and age of P. lineatus? Finally, we propose predictive equations of the length and weight of the fish using length and weight of the otolith. The otoliths were sampled from individuals collected in the Upper Paraná River floodplain during 2012 and 2013 years. The relationships among the otolith measurements and both length and weight of the fish were performed using linear regressions. To test whether the length and weight of the otolith differ between the sampled sites, Variance Analysis was performed. Finally,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Age of fish; Lapillus; Migratory fish; Otolith description; Sábalo.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400207
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Adjustments in population and reproductive dynamics of native and non-native congeneric species during 26 years after invasion Neotropical Ichthyology
Rodrigues,Amanda Cantarute; Santos,Natália Carneiro Lacerda dos; Baumgartner,Matheus Tenório; Gomes,Luiz Carlos.
ABSTRACT We aimed to improve the understanding of the establishment of Serrasalmus marginatus (non-native), which was followed by a decrease in the abundance of Serrasalmus maculatus (native) in the upper Paraná River floodplain. We estimated age, mortality rate, length and age at first maturity and variations in gonad development in three time-periods along a 26-year truncated time scale for both species. Population and reproduction parameters of both species showed substantial fluctuations among periods. Most age classes were sampled in all time-periods, but with considerable difference in abundance, with predominance of older individuals in the second time-period and younger individuals in the third time-period for both species. The mortality rates...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Age structure; Biological invasions; Length at first maturity; Mortality; Serrasalmus.
Ano: 2021 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252021000100202
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