Reprodução de peixes (Osteichthyes) em afluentes do reservatório de Volta Grande, Rio Grande, Sudeste do Brasil

Braga, Francisco Manoel de Souza

doi:10.1590/s0073-47212001000200009

Cited by 36 publications

(28 citation statements)

References 2 publications

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“…Our results contrast with other studies in which these species exhibited greater reproductive intensity during the hottest and rainiest months of the year (Braga, 2001;Carnelós & Benedito-Cecilio, 2002;Luiz, Velludo, Peret, Filho, & Peret, 2011;Barbosa et al, 2012). For C. monoculus the statistical analysis showed that the species did not reproduce throughout the year, but showed a long reproductive period that was not markedly seasonal.…”

Section: Discussioncontrasting

confidence: 99%

Population structure and reproductive period of two introduced fish species in a Brazilian semiarid region reservoir

Sousa

Lopes

Costa

et al. 2015

RBT

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Abstract:The Amazonian fish species Plagioscion squamosissimus (Sciaenidae) and Cichla monoculus (Cichlidae), have been widely introduced into different reservoirs in Brazil, and have caused many negative impacts on local fish fauna. The aim of this study was to evaluate the population structure (abundance, length structure, length-weight relationship, sex ratio, and length at first maturity) and the reprodutive period of these two species in the Santa Cruz Reservoir (built in 2002), located in the Brazilian semiarid region, for their adequate management and local species conservation policies. Specimens were collected quarterly in eight sites from February 2010 to November 2013 using gillnets (12 to 70 mm mesh between adjacent knots). The specimens captured were counted and the following biometric and biological data were analysed: standard length, total weight, and reproductive data, such as, sex, weight and gonadal maturity stage. The species abundances were estimated by CPUE and expressed as the number of individuals per gill net area x gill net exposition time (m 2 x h); length frequency histograms were built with intervals of 5 cm. The length-weight parameters were estimated with a linear regression after a logarithmic transformation of the data. With the reproductive data we estimated sex ratio, reproduction period and length at first maturity (L 50 ). We captured a total of 1 071 specimens of P. squamosissimus and 156 specimens of C. monoculus. Both species showed higher abundances in 2010, 0.004306 m 2 x h and 0.00022 m 2 x h, respectively, but this parameter decreased from 2010 to 2013. Standard length ranged between 6.4 and 46.2 cm for P. squamosissimus (20.025.0 cm was the most frequent class), and 7.0 and 38.7 cm for C. monoculus (10.0-15.0 cm was the most frequent class). The length-weight relationships were described by the following equations: log 10 Wt = -1.8349+3.0899log 10 Lp and R 2 = 0.9795 for P. squamosissimus, and log 10 Wt = -1.7944+3.0885log 10 Lp and Wt = 0.0160 and R 2 = 0.9929 for C. monoculus; both species exhibited positive allometric growth. The sex ratio for both species differed from 1:1, with a predominance of females for P. squamosissimus and males for C. monoculus. The Lp 50 was estimated to be 15.90 cm for P. squamosissimus and 15.65 cm for C. monoculus, and the reproductive data indicated that both species reproduced throughout the year. We concluded that although the population of both species reduced their abundance over the study period, P. squamosissimus and C. monoculus are established and structured populations in the Santa Cruz Reservoir with individuals growing satisfactorily and reproducing in all seasons, without a well-defined reproductive peak. We suggest that the managers may allow the artisanal and/or sport fisheries of these species. Rev. Biol. Trop. 63 (3): 727-739. Epub 2015 September 01.Key words: Cichla monoculus, Plagioscion squamosissimus, dam, population structure, reproductive period.In Brazil the most common direct causes of biodiversity loss in inl...

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Section: Discussioncontrasting

confidence: 99%

Population structure and reproductive period of two introduced fish species in a Brazilian semiarid region reservoir

Sousa

Lopes

Costa

et al. 2015

RBT

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“…No entanto, a maioria dos estudos realizados com Astyanax encontrou uma reprodução sazonal ocorrendo na primavera e verão do hemisfério sul (entre setembro e março), com duração variando entre quatro e seis meses (NOMURA, 1975;BARBIERI et al, 1982BARBIERI et al, , 1996AGOSTINHO et al, 1984;RODRIGUES et al, 1989;BRAGA, 2001;ABILHOA, 2007).…”

Section: Resultsunclassified

Biologia reprodutiva de Astyanax henseli (Teleostei, Characidae) do curso superior do Rio dos Sinos, RS, Brasil

Dala‐Corte

Azevedo

2010

Iheringia, Sér. Zool.

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ABSTRACT. Reproductive biology of Astyanax henseli (Teleostei, Characidae) in the upper Rio dos Sinos, RS, Brazil. This study describes the reproductive biology of a population of Astyanax henseli Melo & Buckup, 2006 from the upper Rio dos Sinos, Caraá, Rio Grande do Sul, Brazil. A total of 336 specimens was analyzed, comprising 169 males, 154 females and 13 individuals of undetermined sex. The reproductive season lasted approximately five months, from August to December, gonadossomatic index (GSI) peaked of in October, corresponding to the end of winter and the spring in the southern hemisphere. No correlation was found between the GSI and abiotic factors (temperature, rainfall and photoperiod). However, these factors may trigger gonad maturation. Also, no correlation was observed between biotic variables, such as stomach repletion index (RI) and hepatosomatic index (HSI), and GSI. Despite that, high RI values during the reproductive period may indicate that A. henseli maintains its feeding activity throughout the reproductive months, while low HSI values during the peak of GSI suggest a higher energy expenditure of the liver during this period. The sex ratio in the population was 1:1 for the total number of individuals sampled, among different classes of length, and among the different months of the year. The size at first gonadal maturation was 69 mm for males and 60 mm for females. The absolute fecundity mean was 3,038 oocytes and the relative fecundity mean was 0.13 oocytes mg -1 . The oocyte development indicated that A. henseli is a total spawner. KEYWORDS.Reproductive period, small size characid, gonadosomatic index, fecundity, first gonadal maturation. RESUMO. No presente estudo é descrita a biologia reprodutiva de uma população de Astyanax henseli PALAVRAS-CHAVE.Período reprodutivo, caracídeo de pequeno porte, índice gonadossomático, fecundidade, primeira maturação gonadal.

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“…Regarding the marine and estuarine species, information on the population dynamics is restricted to specific areas of the Amazon Estuary, considering a few species, such as Scomberomorus brasiliensis, Macrodon ancylodon, Cynoscion acoupa, Sciades parkeri, Cathorops spixii, Stellifer rastrifer, S. naso and Aspredo aspredo (Camargo & Isaac, 1998;Espírito Santo & Isaac, 1999;MMA, 2006). With regards to freshwater sciaenids, some studies on ecology and population dynamics are mainly available for the cogeneric species, the white hake, P. squamosissimus (Rodrigues et al, 1988;Braga, 1997Braga, , 2001Castro, 1999;Carnelós & Benedito-Cecilio, 2002;Stefani et al, 2005;Bennemann et al, 2006). In relation to P. magdalenae, only some information is available on the population parameters in the middle Xingu (Carmargo & Giarrizo, 2009).…”

Section: Discussionmentioning

confidence: 99%

Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae) (Steindachner, 1878) in the bay of Marajo, Amazon Estuary, Brazil

2010

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Plagioscion magdalenae (pacora) is a commercially important benthopelagic sciaenid and widely distributed in the Amazon River basin. The present study describes the reproductive biology of this species in the bay of Marajo, Amazon Estuary, Brazil. The gonadal development stage, age and size at first sexual maturity (L 50 ), sex ratio, and reproductive strategy were determined. The data were collected bi-monthly from December 2005 to October 2006. A total of 251 specimens were examined, with the total length (TL) ranging between 220 and 590 mm. The weight-length relationship for females, males and grouped sexes was highly significant, showing a positive allometry. The L 50 was of 279 mm for grouped sexes, with 305 mm and 269 mm TL for females and males respectively. The sex ratio for the total number of individuals favored the males (2.02 males: 1 female). Macroscopically, the gonads were classified as immature, maturing, mature and spent. Considering the macro and microscopic evaluation of the gonads, an extended spawning period, mainly in August to February, was observed.Plagioscion magdalenae (pescada-curuca) é um sciaenídeo bentopelágico, de importância comercial, amplamente distribuído na bacia do rio Amazonas. O objetivo deste trabalho foi descrever a biologia reprodutiva dessa espécie na baía do Marajó, estuário Amazônico, Brasil. Neste estudo foi determinado o estádio do desenvolvimento gonadal, tamanho de primeira maturação gonadal (L 50 ), proporção entre sexos, época e o tipo de desova. A coleta foi realizada bimestralmente no período de dezembro de 2005 a outubro de 2006. Foi examinado um total de 251 exemplares, variando entre 220 e 590 mm de comprimento total (CT). A relação peso-comprimento para fêmeas, machos e sexos agrupados foi altamente significativa, com alometria positiva. O L 50 foi de 279 mm considerando sexos agrupados, 305 e 269 mm CT para fêmeas e machos respectivamente. A proporção entre sexos para o total de indivíduos foi favorável aos machos (2,02 machos: 1 fêmea). Macroscopicamente, as gônadas foram classificadas em imatura, em maturação, matura e desovada. Considerando-se as avaliações macro e microscópicas das gônadas, foi registrado um período prolongado de desova, principalmente entre agosto e fevereiro.

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Reprodução de peixes (Osteichthyes) em afluentes do reservatório de Volta Grande, Rio Grande, Sudeste do Brasil

Cited by 36 publications

References 2 publications

Population structure and reproductive period of two introduced fish species in a Brazilian semiarid region reservoir

Population structure and reproductive period of two introduced fish species in a Brazilian semiarid region reservoir

Biologia reprodutiva de Astyanax henseli (Teleostei, Characidae) do curso superior do Rio dos Sinos, RS, Brasil

Reproductive biology of Plagioscion magdalenae (Teleostei: Sciaenidae) (Steindachner, 1878) in the bay of Marajo, Amazon Estuary, Brazil

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