2016
DOI: 10.1590/1678-4766e2016017
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Polyphasic growth in fish: a case study with Corydoras paleatus (Siluriformes, Callichthyidae)

Abstract: ]; where W is the expected weight for a specifi c length L, a 1 and a 2 are the proportionality coeffi cients for stanzas 1 and 2, b 1 and b 2 are the allometric coeffi cients for stanzas 1 and 2, R sc is the stanza changing rate for the switch function and SCP is the stanza changing point for the switch function. The stanza changing point was estimated as 5.28 cm, corresponding with the length at fi rst maturity for this species L mat (5.29 cm). Our data suggest that a complex growth pattern can be in nature,… Show more

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Cited by 4 publications
(5 citation statements)
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“…It was biphasic for both males and females, trending to allometric negative and positive for males and females in first stanza, respectively. Polyphasic growth pattern has already been reported for other fish species, including the Characidae A. jacuhiensis and Cheirodon ibicuhiensis (Fontoura, Jesus, Larre, & Porto, 2010), as well as for the Siluriformes Auchenipterichthys longimanus (Freitas, Almeida, Montag, & Fontoura, 2016) and Corydoras paleatus (Barradas, Lermen, Larré, Martins, & Fontoura, 2016). These studies associated polyphasic growth with reproductive investment, that is, stanza change coinciding with first maturation size.…”
Section: Biological Considerationsmentioning
confidence: 56%
“…It was biphasic for both males and females, trending to allometric negative and positive for males and females in first stanza, respectively. Polyphasic growth pattern has already been reported for other fish species, including the Characidae A. jacuhiensis and Cheirodon ibicuhiensis (Fontoura, Jesus, Larre, & Porto, 2010), as well as for the Siluriformes Auchenipterichthys longimanus (Freitas, Almeida, Montag, & Fontoura, 2016) and Corydoras paleatus (Barradas, Lermen, Larré, Martins, & Fontoura, 2016). These studies associated polyphasic growth with reproductive investment, that is, stanza change coinciding with first maturation size.…”
Section: Biological Considerationsmentioning
confidence: 56%
“…To support interpretations regarding changes in morphometric otolith patterns, the otoliths were photographed, and an illustrative schematic of male and female lapilli otoliths during different development stages was elaborated. The relationships between somatic and otolith growth for G. genidens males and females were estimated based on two methodologies, by adjusting the traditional power model (Huxley, 1924) and the polyphasic model (Bervian et al, 2006, modified by Barradas et al, 2016). The latter approach considers a growth pattern comprising two distinct phases, separated by a stanza changing point (SCP), which indicates the Lt at the time individual growth pattern changed.…”
Section: Methodsmentioning
confidence: 99%
“…The nonlinear least squares method was applied to the proportional residuals to y through the Levenberg-Marquardt algorithm using the nlsLM function present in the minpack.lm (Elzhov et al, 2016) package of the statistical platform R (R Core Team, 2017). Due to the naturally occurring heteroscedasticity of this data set, homocedastic residues were used for model fit, instead of gross residues (Barradas et al, 2016). For the polyphasic model analysis, the moving average of the residuals was used to verify the somatic length range in which changes in male and female growth patterns occur, by observing the trends for each point.…”
Section: Methodsmentioning
confidence: 99%
“…Se calculó la prevalencia, la intensidad media y la abundancia parasitaria según Bush et al (1997) para cada especie de parásito en cada sitio de estudio. Estos parámetros a su vez se discriminaron según talla de primera maduración (Barradas et al, 2016) entre ejemplares mayores y menores a 60 mm de longitud total. A nivel de comunidad componente se calculó la riqueza específica, el índice de diversidad de Shannon-Wiener y el índice de equitatividad de Pielou (Magurran, 1988).…”
Section: Análisis Parasitológicounclassified