Population structure and reproduction of a migratory fish Leporinus piau (Characiformes: Anostomidae) in a semiarid tropical reservoir, Brazil

Population structure and reproduction of a migratory fish Leporinus piau (Characiformes: Anostomidae) in a semiarid tropical reservoir, Brazil
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Population structure and reproduction of a migratory fish Leporinus piau (Characiformes: Anostomidae) in a semiarid tropical reservoir, Brazil

Migratory fishes have been seriously impacted by the building of reservoirs and because of the negative effects of these projects such as the interruption of migratory routes, reduction or elimination of spawning/feeding areas, and initial development can influence the population structure the migra...

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Translated title: Estructura poblacional y reproducci贸n del pez migratorio Leporinus piau (Characiformes: Anostomidae) en una represa tropical semi谩rida, Brasil
Journal Title: Revista de Biolog铆a Tropical
Main Author: Darlan Dantas Alves de Ara煤jo
Other Authors: J么nnata Fernandes de Oliveira;
Rodrigo Silva da Costa;
Jos茅 Lu铆s Costa Novaes
Palabras clave:
Traslated keyword:
Language: English
Get full text: http://revistas.ucr.ac.cr/index.php/rbt/article/view/21553
Resource type: Journal article
Source: Revista de Biolog铆a Tropical; Vol 64, No 4 (Year 2016).
DOI: http://dx.doi.org/10.15517/rbt.v64i4.21553
Publisher: Universidad de Costa Rica
Usage rights: Reconocimiento - NoComercial - SinObraDerivada (by-nc-nd)
Subjects: Sciences --> Biology
Sciences --> Marine & Freshwater Biology
Applied Sciences --> Agriculture, Multidisciplinary
Abstract: Migratory fishes have been seriously impacted by the building of reservoirs and because of the negative effects of these projects such as the interruption of migratory routes, reduction or elimination of spawning/feeding areas, and initial development can influence the population structure the migratory fishes, resulting in reduction in abundance. Leporinus piau is migratory fish widely distributed in the watersheds of the Brazilian semiarid 聽聽聽聽聽聽聽聽聽聽聽 and it is of importance for artisanal and sport fishing. The goal of the study was to evaluate the population structure and reproductive dynamics of the migratory species Leporinus piau in the Pau dos Ferros Reservoir, which is located in the semiarid region of Brazil. The CPUE, length structure, length-weight relationship, length at first maturity, sex ratio, gonad development and IGS were analyzed. Collections were performed quarterly between February 2011 and November 2012 using gillnets. The captured fish were counted; the standard length (cm) and total weight (g) were measured, and dissected to determine the sex and gonad maturity stage. The rainfall and reservoir water levels were recorded, and their correlations with the reproductive period and CPUE were analyzed. A total 549 individuals were captured. The average CPUE varied between 0.0259 individuals/m2*h (May/2011) and 0.0008 individuals/m2*h (August/2012), and significant differences were observed; however, significant correlations were not observed between rainfall and reservoir levels. The standard length varied between 5.9 cm and 20.7 cm, and the weight varied between 4.16 g and 271.5 g. A histogram analysis revealed that the 5-10 cm standard length class was the most abundant for juveniles and that the 10-15 cm class was the most abundant for adult females and males. The weight-length relationship was best fit by the equation log10Wt = -1.57711 + 3.00707 Log10 Ls, and the species presented isometric growth. The estimated length at first maturity was 12.76 cm. A total of 148 males and 82 females were collected (1.81:1, M:F), and these values were significantly different. The highest GSI was observed in February 2011 for both females (10.69) and males (5.72), and the GSI was significantly and positively correlated with rainfall. We concluded that the L. piau population is established in the reservoir and found that its reproduction period occurred during the rainy season between February and May.
Translated abstract: Los peces migratorios se han visto gravemente afectados por la construcci贸n de embalses y los efectos negativos de estos proyectos, tales como la interrupci贸n de rutas migratorias, reducci贸n o eliminaci贸n de desove / 谩reas de alimentaci贸n. El desarrollo inicial puede influir en la estructura de la poblaci贸n de los peces migratorios, lo que resulta en la reducci贸n en la abundancia de los mismos. El Leporinus piau es un pez migratorio que se encuentra ampliamente distribuido en las cuencas del semi谩rido brasile帽o y es de importancia para la pesca deportiva y artesanal. El objetivo del estudio fue evaluar la estructura de la poblaci贸n y la din谩mica de reproducci贸n de la especie migratoria Leporinus piau en el embalse Pau dos Ferros, regi贸n semi谩rida de Brasil. La relaci贸n estructura de tallas y talla-peso de la CPU la talla de la primera la madurez, proporci贸n de sexos, el desarrollo gonadal y el IGS se analizaron. Con redes de enmalle se llevaron a cabo recolecciones trimestralmente entre febrero 2011 y noviembre 2012. Se contaron los peces capturados; se midieron la longitud est谩ndar (cm) y peso total (g), y se disectaron para determinar el estadio del sexo y la madurez de las g贸nadas. Los niveles de agua de lluvia y los embalses se registraron y se analizaron sus correlaciones con el per铆odo reproductivo y la CPUE. Un total de 549 individuos fueron capturados. La CPUE promedio vari贸 entre 0.0259 individuos/m2 * h (mayo/ 2011) y 0.0008 individuos/m2 * h (Agosto/2012), y se observaron diferencias significativas; sin embargo, ninguna correlaci贸n significativa se observo entre los niveles de lluvia y el nivel de la represa. La longitud est谩ndar vari贸 entre 5.9 y 20.7 cm, y el peso entre 4.16 y 271.5 g. Un an谩lisis de histogramas, revel贸 que la clase est谩ndar de 5-10 cm de longitud fue la m谩s abundante de los j贸venes y que la clase 10-15 cm fue la m谩s abundante de las hembras y machos adultos. La relaci贸n peso-talla se ajusta m谩s adecuadamente a la ecuaci贸n log10Wt = -1.57711 + 3.00707 Log10 Ls, donde la especie presenta un crecimiento isom茅trico. La medida estimada de la primera madurez fue 12.76 cm. Se recogieron un total de 148 machos y 82 hembras (1.81: 1, M: F), y estos valores fueron significativamente diferentes. El m谩s alto GSI se observ贸 en febrero 2011, tanto para las mujeres (10.69) como para hombres (5.72), y el GSI fue significativa y positivamente correlacionado con la precipitaci贸n. Se lleg贸 a la conclusi贸n de que la poblaci贸n L. piau est谩 establecida en la represa y encontramos que su periodo de reproducci贸n se produjo durante la 茅poca de lluvias entre febrero y mayo.