Dieta do tucunaré-amarelo Cichla monoculus (Bloch &amp; Schneider) (Osteichthyes, Cichlidae), no Reservatório de Lajes, Rio de Janeiro, Brasil

Santos, Luciano Neves dos; Gonzalez, Alejandra Filippo; Araújo, Francisco Gerson

doi:10.1590/s0101-81752001000500015

Cited by 38 publications

(29 citation statements)

References 7 publications

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“…According to SANTOS et al (2001), O. hepsetus showed a low contribution to the C. monoculus diet (< 3.0% IRI), while in the present study C. monoculus comprised the major prey eaten by O. hepsetus (43.0% IRI). Therefore, O. hepsetus seems to play a key role in the reservoir food web, acting as prey for large piscivorous fishes and predator for smaller ones.…”

Section: Discussioncontrasting

confidence: 49%

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Spatial and seasonal changes in the diet of Oligosarcus hepsetus (Characiformes, Characidae) in a Brazilian Reservoir

et al. 2005

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We assessed spatial and seasonal changes in the diet of Oligosarcus hepsetus in order to describe the strategy developed by this species that allows their very high abundance in Lajes reservoir, Rio de Janeiro, Brazil. Fish samplings were carried out using gill nets, deployed during ca. 12 and 24 hours, between April 2001 and May 2002. A total of 289 individuals were examined, of which 97 showed gut contents. We used the index of relative importance (IRI) to compare probable dietary shifts, and the frequency of occurrence (% OC) to analyze possible ontogenetic influences on feeding. O. hepsetus showed carnivorous habits, feeding preferably on fish and insects, the latter of which occurred in 71.0% of the guts presenting contents. O. hepsetus consumed different items along the three reservoir zones: insects (61.0% IRI) and Cichla monoculus (38.9% IRI) in the lower zone; Lepidoptera (57.0% IRI) in the middle zone; and C. monoculus (77.0% IRI) in the upper zone. Food items changed seasonally with C. monoculus predominating in autumn 2001, and Hymenoptera and Lepidoptera in the winter. In spring almost all food was Lepidoptera (99.8% IRI), while in the summer Hemiptera dominated in the diet. In autumn 2002 Hemiptera (97.0% IRI) was dominant, in significant contrast with the previous autumn. Individuals smaller than 190 mm SL fed heavily on insects, while fishes predominated in the diet of individuals larger than 190 mm SL. Shifts in prey-capture ability among length classes suggest decreasing intraspecific competition. A higher food plasticity seems to be the strategy employed by this opportunist species, which used food resources available in the reservoir.Key words: food habit, diet, Characiforms, reservoirs. RESUMO

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Section: Discussioncontrasting

confidence: 49%

“…According to Santos et al (2001), the reservoir is divided into three zones ( Fig. 1) having different environmental characteristics: (1) the upper zone, situated near the reservoir headwaters at the entrance of the main tributaries.…”

Section: Study Areamentioning

confidence: 99%

Spatial and seasonal changes in the diet of Oligosarcus hepsetus (Characiformes, Characidae) in a Brazilian Reservoir

et al. 2005

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“…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. However, the logistic regression method used in our study and by Rocha et al (2006), Camargo andJúnior (2007), Santos, Gonzalez and Araújo (2001), and Barbosa, Rocha and Frédou (2012) is more robust and more suitable for this analysis (King, 2007), therefore, the estimates made using this method are more reliable. According with King (2007) other factors that may have caused the difference in size at first maturation include: (1) Food availability: In the Santa Cruz Reservoir P. squamosissimus and C. monoculus had an abundance of food, as suggested the length-weight relationship with a b value near 3, so the fish could allocate enough energy to growth and early maturation; (2) Absence of predators: With less energy expended to avoid predators, more energy could be allocated to maturation; and (3) High and constant temperature throughout the year in the region: at high temperature, the growth rate is higher.…”

Section: Discussionmentioning

confidence: 55%

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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“…The cannibalism also can reduce the chances of surviving of a non native fish in a new environment. The drastic reduction of the introduced population, reduce the genetic and morphologic variability, as well as the reproduction success (Wootton, 1990;Santos et al, 2001).…”

Section: Discussionmentioning

confidence: 99%

Impact assessment of the introduction of Cichla kelberi in a large Neotropical reservoir and its lateral lagoons (Upper Paraná River Basin, Brazil)

Ferrareze

Nogueira

2015

Braz. J. Biol.

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This study aimed to understand how the introduction of Cichla kelberi in Rosana Reservoir (Paranapanema River) affected the native ichthyofauna. Data on the structure of the small fish fauna assemblage were obtained before and after the introduction of this carnivorous species. Samplings were carried out in The order Characiformes was the most abundant, followed by Perciformes and Siluriformes. Comparative analyses, before and after the introduction, could not demonstrate significant changes in composition, richness, abundance, biomass, mean length and diversity of fish. Aquatic insects were the main feeding item of C. kelberi, followed by tetragonopterinae fish. Cannibalism was recorded during the whole study period. The results showed that Cichla cannot deeply affect the ichthyofauna assemblages of a large Neotropical reservoir, at least in a short or medium term period after its introduction. The results also allowed concluding that the introduction of C. kelberi in the reservoir is in the phase 3. In this phase, the specie can survive and reproduce in the new environment; however it is not totally established and disseminated. The reasons for the fact that Cichla is still not dominant in Rosana Reservoir could be related to feeding competition, high rate of cannibalism and the presence of large amount of aquatic macrophytes (refuge zones). In spite of the results, the continuous monitoring of the role of non-native species on the local fish fauna is absolutely necessary because the impacts caused by colonization of this undesirable species can be magnified by complex processes, usually correlated with other environmental disturb, especially the negative effects of damming.Keywords: Paranapanema River, Rosana reservoir, non-native fish, biodiversity, ecological impact. Avaliação do impacto da introdução da

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Dieta do tucunaré-amarelo Cichla monoculus (Bloch & Schneider) (Osteichthyes, Cichlidae), no Reservatório de Lajes, Rio de Janeiro, Brasil

Cited by 38 publications

References 7 publications

Spatial and seasonal changes in the diet of Oligosarcus hepsetus (Characiformes, Characidae) in a Brazilian Reservoir

Spatial and seasonal changes in the diet of Oligosarcus hepsetus (Characiformes, Characidae) in a Brazilian Reservoir

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

Impact assessment of the introduction of Cichla kelberi in a large Neotropical reservoir and its lateral lagoons (Upper Paraná River Basin, Brazil)

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