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Feeding rate and feeding frequency affect growth performance of common snook (Centropomus undecimalis) juveniles reared in the laboratory R. Bras. Zootec.
Oliveira,Ricardo Luís Mendes de; Santos,Leilane Bruna Gomes dos; Silva Neto,Nelson Gomes da; Silva,Scarlatt Paloma Alves da; Silva,Felipe dos Santos; Melatti,Enrique; Cavalli,Ronaldo Olivera.
ABSTRACT The effects of feeding rate and feeding frequency on the growth of laboratory-reared common snook (Centropomus undecimalis) were evaluated. Juveniles with mean±SD weight of 2.55±0.48 g and total length of 6.81±0.48 cm were divided into groups of 20 fish and reared in 30 polyethylene tanks of 50 L for 60 days. The experimental design was a 3 × 3 factorial with three feeding frequencies (F2, F4, and F6: two, four, and six daily meals, respectively), three feeding rates (R1, R2.5, and R4: 1.0, 2.5, and 4.0%/day of fish biomass, respectively), and three replicates, totaling nine treatments (F2R1, F2R2.5, F2R4; F4R1, F4R2.5, F4R4; F6R1, F6R2.5, and F6R4). The external control consisted of four meals a day offered to apparent satiety (F4S). Every 15...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aquaculture; Feeding; Feed management; Marine fish farming.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982019000100152
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Sexual reproduction in freshwater fairy shrimp, Dendrocephalus brasiliensis (Pesta, 1921) inferred by Amplified Fragment Length Polymorphism markers Ciência Rural
Silva,Suzianny Maria Bezerra Cabral da; Santos,Leilane Bruna Gomes dos; Lopes,José Patrocínio; Gálvez,Alfredo Olivera; Coimbra,Maria Raquel Moura.
Fluctuations in world harvests of Artemia sp cysts have increased prices sharply in the past years. Several organisms have been tested as alternative sources for a total or partial replacement of Artemia sp, among which the microcrustacean (Anostraca) Dendrocephalus brasiliensis stands out. The objective of this study was to investigate the reproductive strategy of D. brasiliensis by means of AFLP markers. The distinction between sexual and parthenogenetic reproduction was conducted using 7 EcoRI and MseI primer combinations in a full-sib family composed of 13 progenies. Forty polymorphic markers were obtained, of these, 35% were from paternal origin and 65% were maternally inherited. Results showed mendelian segregation in all markers through the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microcrustacea; AFLP; Paternal inheritance; Sexual reproduction.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782013000600021
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