Reproductive Strategies of Plagioscion squamosissimus Heckel, 1840 (Osteichthyes Sciaenidae) in the Itaipu Reservoir, Brazil

Abstract

Plagioscion squamosissimus is a dominant species in the Itaipu reservoir and has a significant role in the regional economy. The aim of the present research was the investigation of the curvina's reproductive strategies during the first years of the Itaipu reservoir (November 1983 to October 1989). Collections were undertaken from eleven sampling sites in the reservoir area, left bank tributaries, Paraná River and its tributaries. Species begin the reproduction in the area of influence of the Itaipu reservoir only in 1986. Size of early maturation, local and period of spawning showed gradual variations, with a broadening trend of this activity in the area, and thus guaranteeing success of the species. Mean size of early sexual maturation for the Plagioscion squamosissimus reached 16.2 cm for males and 17.8 cm for females.<br>Plagioscion squamosissimus, amplamente distribuída na América do Sul, constituiu-se no reservatório de Itaipu em uma das espécies dominantes e de expressiva participação nos desembarques comerciais. Com o intuito de investigar as estratégias reprodutivas utilizadas pela espécie nos primeiros anos de formação do reservatório de Itaipu foram realizadas coletas durante o período de novembro de 1983 a outubro de 1989 em onze estações de amostragens situadas na área do reservatório, tributários da margem esquerda, rio Paraná e seus tributários. Constatou-se que a espécie iniciou o processo reprodutivo na área de influência o reservatório de Itaipu somente apartir de 1986. Após este período a estratégia reprodutiva exibida pela espécie foi adaptativa, sendo que o tamanho da primeira maturação, local e período de desova, apresentaram variações gradativas no sentido de ampliação desta atividade na área, garantindo o sucesso da espécie. O tamanho médio da primeira maturação sexual para a população de P. squamosissimus é de 16,2 cm para machos e de 17,8 cm para fêmeas

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

“…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.…”

“…The differences in size at first maturation can be attributed to several factors, such as species differences, methods of determining the size at first maturation, or adaptation to the environment (Helfman et al, 2007). Most previous works, Carnelós and Benedito-Cecilio (2002), Chellappa et al (2003) and Gomiero and Braga (2004), used the method described by Vazzoler (1996), where the fit is manual. Souza et al (2008) considered the size at first maturation to be the shortest length at which individuals at the advanced maturation stage were found.…”

“…Plagioscion squamosissimus can reach 80.0 cm of total length and weight 4.5 kg (Froese & Pauly, 2014), has a high fecundity and a long reproductive period with a peak during the rainy season (Godinho, Lamas, & Godinho, 2010); previous studies have shown that the first maturity (L 50 ) can vary between 17.80 cm and 32.40 cm (Carnelós & Benedito-Cecilio, 2002;Rocha, Juras, Cintra, & Souza, 2006). The species occupies diverse biotopes and carries out its biological cycle in freshwater as well as in brackish water.…”

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

“…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).…”

Reproductive tactics used by the Lambari Astyanax aff. fasciatus in three water supply reservoirs in the same geographic region of the upper Iguaçu River

“…Works on reproduction are also used in the analysis of impacted areas, permitting the evaluation of the reproductive capacity of the species that suffer stress from anthropogenic environments (Carnelós & Cecilio, 2002;Baylly et al, 2005;Wahbi & El-Greisy, 2007). Thus, considering that reproductive success is fundamental to the perpetuation of fish species and the consequent viability of the populations, the evaluation and understanding of the reproduction of fishes in anthropogenic environments is of fundamental importance.…”