Length-weight relationship of 21 fish species from Rio Doce River basin, Minas Gerais, Brazil

Salvador, Gilberto Nepomuceno; Frederico, Renata G.; Pessali, Tiago Casarim; Vieira, Fábio; Freitas, T. M. S.

doi:10.1111/jai.13734

Cited by 12 publications

(9 citation statements)

References 8 publications

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“…An exception is shown by Mendonça et al (2015), which recorded an isometric growth for H. affinis from Juturnaíba Reservoir, southeastern Brazil. The variation in the allometric coefficient in H. affinis is also in according to the pattern described to other Hypostomus species, which values ranging from 2.604 for Hypostomus margaritifer to 3.104 for Hypostomus velhochico, both from the São Francisco River basin (Nobile et al, 2015;Pessali et al, 2022;Salvador et al, 2018).…”

Section: Discussionmentioning

confidence: 53%

“…The knowledge on the biological aspects of Hypostomus species is scarce, considering its diversity (Gomes et al, 2015). Until now, the existent studies regard few species, addressing: the breeding cycle (Galarça et al, 2014;Mazzoni & Caramaschi, 1997), spawning behavior (Menezes & Caramaschi, 1994), fecundity (Mazzoni & Caramaschi, 1997;Takahashi et al, 2008), growth pattern (Salvador et al, 2018(Salvador et al, , 2017, and general reproductive tactics (Gomes et al, 2015;Sales et al, 2016). Although the shortfall in knowledge, the pleco Hypostomus affinis (Steindachner, 1877) is one of the most studied taxa of this genus regarding its biology (Duarte et al, 2011;Duarte & Araújo, 2002;Mazzoni & Caramaschi, 1997).…”

Section: Introductionmentioning

confidence: 99%

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Biological aspects of Hypostomus affinis (Siluriformes: Loricariidae) in Brazilian coastal rivers

Freitas

Salvador

2022

Acta Limnol. Bras.

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Aim Determine the length-weight relationship (LWR), the period of reproduction, and evaluate the variation of the condition factor (K) of Hypostomus affinis from two coastal drainages in southeastern Brazil, assessing the influence of the rainfall on these biological aspects. Methods fish were sampled quarterly between April 2008 and April 2010 in tributaries of the Doce River basin (DRB) and the Paraíba do Sul River basin (PSRB). Specimens were caught using gillnets. LWR parameters were assessed by location and sex through a t-test. We used the frequency of mature specimens (FM) to evaluate the breeding period. Both FM and K values were assessed by a sinusoidal equation. Results A total of 492 specimens was captured, of which 128 were from the Doce River basin (DRB) and 364 from the Paraíba do Sul River basin (PSRB). In both areas, specimens showed a negative allometric growth type. We collected mature specimens along the studied period in both drainages, with the highest frequency observed at the beginning of the rainy season. We found a positive correlation between the rate of matures and the local rainfall variation. The condition factor (K) was lower for specimens from DRB and did not show a cyclic trend. On the other hand, we observed a cyclic chance of the K values for the individual from the PSRB, peaking in the transitional dry-rainy period. However, it was not possible to correlate it to the rainfall variation. Conclusions LWR parameters of H. affinis were consistent with data already available in the literature. The rainfall may influence the FM but not the K values. In this case, biological characteristics such as reproduction and (or) feeding may be jointly driving a discrete variation of K values. The reduction in K values in the rainy periods suggests a remarkable energetic cost for the reproductive process. In short, our results help us to understand the life cycle of a fish species within a highly modified environment, especially by dams.

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Section: Discussionmentioning

confidence: 53%

Section: Introductionmentioning

confidence: 99%

Biological aspects of Hypostomus affinis (Siluriformes: Loricariidae) in Brazilian coastal rivers

Freitas

Salvador

2022

Acta Limnol. Bras.

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“…The LWR estimations followed the model first proposed by Järvi (1920) (see Froese, 2006), Wt = a × Ls b , which considers the coefficients related to the degree of individuals fattening (coefficient of proportionality— a ) and growth (coefficient of allometry— b ). We performed an outlier verification routine, excluding from the analysis every specimen with double of the standard deviation of the proportional residuals ([observed − predicted]/predicted) (see Salvador et al, 2018). The LWR parameters were estimated from a non‐linear regression (Levenberg‐Marquardt algorithm) using function nlsML of the R package minpack .…”

Section: Methodsmentioning

confidence: 99%

Length–weight relationships of 78 fish species from São Francisco River basin, Brazil

Pessali¹,

Salvador

Alves

et al. 2022

J Appl Ichthyol

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We established the length–weight relationships (LWR) for 78 fish species from the São Francisco River basin, Brazil. Samples were originated from different scientific projects performed between 1993 and 2019. Fishing gears used were mainly gillnets and cast nets of various mesh sizes. Specimens varied from 0.6 to 128 cm (18.1 ± 11.8 cm) and from 0.01 to 26,900 g (317.9 ± 733.6 g). The allometric coefficient b varied from 2.509 to 3.494. For 66 species, the LWR parameters were completely novel and, for the other 12 species, are present for the first time for the São Francisco River basin.

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“…The length–weight equation applied followed the model proposed by Järvi () (see Froese, ), TW = a × SL b , which considered the coefficient of proportionality ( a ) and the coefficient of allometry ( b ; interpreted as growth pattern). An outliers exclusion routine was applied (Salvador, Frederico, Pessali, Vieira, & Freitas, ). The LWR parameters were estimated from non‐linear regressions in the software R (R Core Team, ).…”

Section: Methodsmentioning

confidence: 99%

Length–weight relationships of 11 fish species from streams of Anapu River Basin, State of Pará, eastern Amazon, Brazil

et al. 2019

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The present study shows the length–weight relationships (LWR) for 11 stream fish species from Anapu River Basin, in eastern Amazon, Pará State, Brazil. Samplings were carried out in October and November 2010, 2012 and 2013, and fishes were collected using hand nets of 55 cm of diameter and 2 mm mesh size. Fixed specimens were measured for standard length (cm) and total weight (g). Allometric coefficients b varied from 2.606 to 3.335 and coefficients of determination (R2) varied from 0.902 to 0.986. Shrinkage effect must be considered in future investigations in order to provide a correction factor.

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Length-weight relationship of 21 fish species from Rio Doce River basin, Minas Gerais, Brazil

Cited by 12 publications

References 8 publications

Biological aspects of Hypostomus affinis (Siluriformes: Loricariidae) in Brazilian coastal rivers

Biological aspects of Hypostomus affinis (Siluriformes: Loricariidae) in Brazilian coastal rivers

Length–weight relationships of 78 fish species from São Francisco River basin, Brazil

Length–weight relationships of 11 fish species from streams of Anapu River Basin, State of Pará, eastern Amazon, Brazil

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