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dos Santos J.C.E.,Centro Integrado Of Recursos Pesqueiros E Aquicultura Of Tres Marias | Sato Y.,Centro Integrado Of Recursos Pesqueiros E Aquicultura Of Tres Marias | Santos A.J.G.,Federal Rural University of Pernambuco | De Paula Mendes P.,Federal Rural University of Pernambuco | And 2 more authors.
Pesquisa Agropecuaria Brasileira | Year: 2013

The objective of this work was to compare two hypophysation protocols in the spawning induction of curimatã-pacu. The application of a single dose or two doses of crude carp pituitary extract was tested. That there was no significant difference among the protocols for the rate of females that have spawned, fertilization and deformed larvae. A single dose application resulted in higher degree-hour values until the oocyte extrusion than two doses. The application of a single dose represented a lower consumption of water, energy, and handling time. A single dose protocol can be used as an alternative for inducing the curimatã-pacu spawning. Source


dos Santos J.C.E.,Centro Integrado Of Recursos Pesqueiros E Aquicultura Of Tres Marias | Correia E.S.,Federal Rural University of Pernambuco | Luz R.K.,Federal University of Minas Gerais
Boletim do Instituto de Pesca | Year: 2015

The aim of this study was to investigate different daily Artemia nauplii concentrations during juvenile production of pacamã, Lophiosilurus alexandri. Six different daily Artemia nauplii concentrations (100, 400, 700, 1,100, 1,400, and 1,600 nauplii larvae-1) were tested during 15 days of feeding. The higher growth (weight and length) and lower water quality (higher ammonium ion levels) were registered to the higher initial daily Artemia nauplii concentration. Survival between 90.9 and 99.1% was not influenced by Artemia nauplii concentrations. Different Artemia nauplii concentrations provided high survival and avoided cannibalistic behavior, and initial concentrations of 1,600 nauplii larvae-1 provide higher growth on L. alexandri larviculture. © 2015, Instytut Technologii Drewna. All rights reserved. Source


dos Santos J.C.E.,Centro Integrado Of Recursos Pesqueiros E Aquicultura Of Tres Marias | Pedreira M.M.,Federal University of Vales do Jequitinhonha and Mucuri | Luz R.K.,Federal University of Minas Gerais
Revista Caatinga | Year: 2016

The feeding frequencies on pacamã Lophiosilurus alexandri larviculture were evaluated. In the first phase, 10 days of active feeding, larvae with nine days post hatching (13.5 ± 0.7 mm) were stocked at density of 10 larvae L-1 in 5-L tanks each. The experimental treatments were: F2T (feeding 8h00 and 17h00); F2M (feeding 8h00 and 12h30); F3 (feeding 8h00, 12h30 and 17h00); and F4 (feeding 8h00, 11h00, 14h00 and 17h00). During this phase Artemia nauplii were used as food. In the second phase, during 15 days, juveniles were restocked in 20-L tanks at density of 2.2 juveniles L-1, and kept the same feeding frequencies of the first phase. Commercial dry diet containing 40% crude protein was used as food. No effect of feeding frequency on growth and survival, during both phases, was observed. However, survival decreases from the first to the second phase, showing the importance of the type of food. During the L. alexandri larviculture should be recommended twice a day feeding frequency. © 2016, Universidade Federal Rural do Semi-Arid. All Rights Reserved. Source


Nunes D.M.F.,Pontifical Catholic University of Minas Gerais | Magalhaes A.L.B.,Pontifical Catholic University of Minas Gerais | Weber A.A.,Pontifical Catholic University of Minas Gerais | Weber A.A.,Federal University of Minas Gerais | And 6 more authors.
Neotropical Ichthyology | Year: 2015

A total of 312 adults of matrinxã were captured bimonthly, between 2011-2012, in two sites of the rio São Francisco: immediately downstream of the Três Marias Dam (site 1) and in the confluence with the rio Abaeté (site 2). Specimens of Brycon orthotaenia from site 2 presented higher values of total length (32.24 ± 5.70 cm for females and 26.64 ± 3.79 cm for males) and body weight (506.66 ± 332.17 g for females and 267.36 ± 145.84 g for males), when compared with the site 1. In site 2 was registered the highest GSI means (9.97 ± 2.96 for females and 0.93 ± 0.52 for males), compared with the site 1 means. Reproduction period occurred from October to February. Unlike site 2, no spawned females or spent males were captured in site 1. Significant differences were found between females and males in site 2 (χ2 = 26.84, df = 1, P < 0.05). Physical-chemical parameters of the water presented higher values in site 2. The canonical correlation test indicated that the reproduction of males is less susceptible to environmental factors than that of females. These results show that B. orthotaenia finds favourable conditions to reproduction just in site 2. © 2015 Sociedade Brasileira de Ictiologia. Source


dos Santos J.C.E.,Centro Integrado Of Recursos Pesqueiros E Aquicultura Of Tres Marias | Pedreira M.M.,Federal University of Minas Gerais | Luz R.K.,Federal University of Minas Gerais
Acta Scientiarum - Biological Sciences | Year: 2012

The aim of this study was to evaluate three stocking densities (20, 40 and 60 larvae L -1), and two daily prey concentrations (400 and 700 Artemia nauplii larvae -1) during the first seven days of active feeding (first phase). In the second phase was evaluate the effect of the different feeding regimes: fasting, dry diet (55% crude protein), Artemia sp. and mixed feeding (Artemia sp. plus dry diet), after 17 days of active feeding on Rhinelepis aspera larviculture. In the first phase, growth was affected only by prey concentration. In the second phase, the dry diet induced higher growth rates than fasting, but lower growth rates than the other treatments. The acceptance of the dry diet was evidenced by an increase in the growth rate from 4.6% day -1 in the first five days to 10.7% day -1 in the following five days of feeding. Survival was similar among dry diet, mixed feeding and Artemia nauplii treatments. R. aspera larvae can be reared during the first seven days of active feeding at a density of 60 larvae L -1, after which they can be fed with a commercial dry diet. Source

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