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Search Results: 1 - 10 of 329921 matches for " Sérgio Renato Noguez Piedras "
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Feeding of Hoplias aff. malabaricus (Bloch, 1794) and Oligosarcus robustus Menezes, 1969 in a lagoon under estuarine influence, Pelotas, RS
Fabiano Corrêa,Sérgio Renato Noguez Piedras
Biotemas , 2009,
Abstract: The objective of the present paper was to study the diets of Hoplias aff. malabaricus and Oligosarcus robust in “Pequena Lagoon” and evaluate the importance of estuarine organisms in the feeding of freshwater fish. A total of twelve food categories were identified and it was established that the fish resource was the most frequent in the diet of both species. Euryhaline fish such as Mugil platanus mullets and Odontesthes argentinensis silversides were common items in the diets of these two species, which included not only freshwater fish but also euryhaline fish from the adjacent estuarine zone, integrating both resources in the food chain.
Alimenta??o de alevinos de peixe-rei (Odontesthes bonariensis) com dietas naturais e artificiais
Piedras, Sérgio Renato Noguez;Pouey, Juvêncio Luís Osório Fernandes;
Ciência Rural , 2004, DOI: 10.1590/S0103-84782004000400036
Abstract: an experiment was run to evaluate three feeding methods for pejerrey fingerlings, in a complete randomized design with four replications. each experimental unit consisted of a 20l aquarium and 20 three days old fingerlings. for six weeks, three times a day, fish received the following diets: t1= mash diet; t2= mash diet + zooplankton; t3= zooplankton. results showed that zooplankton promotes better fingerlings growth and survival. fish fed with mash diet showed significantly lower growth and survival, but acceptable considering actual status of nutrition studies for pejerrey.
Efeito da suplementa??o de metionina e/ou lisina no crescimento e na sobrevivência de alevinos de peixe-rei (Odontesthes bonariensis)
Piedras, Sérgio Renato Noguez;Pouey, Juvêncio Luís O. Fernandes;Rutz, Fernando;
Revista Brasileira de Zootecnia , 2004, DOI: 10.1590/S1516-35982004000600002
Abstract: a completely randomized experiment was run to evaluate the effect of methionine and lysine supplementation on the pejerrey (odontesthes bonariensis) fingerlings performance. four treatments were compared: diet t1 control, with available contents mehionine and lysine in products used in formulation of diets; diet t2 supplemented with 4.76% of dl- methionine; diet t3 supplemented with 4.76% of l- lysine and diet t4 with 4.54% of dl methionine and 4.54% of l lysine. resulted showed that diets containing methionine were more efficient than control diet and diet with lysine only. control diet did not differ from diet with lysine supplementation only. it is shown that contents of available lysine in products used in the formulation of diets meet pejerrey fingerlings requirements. amounts of methionine in control diet are insufficient for fingerlings growth. a supplementation of this aminoacid is required to maximize performance.
Toxicidade aguda da am?nia n?o ionizada e do nitrito em alevinos de Cichlasoma facetum (Jenyns, 1842)
Piedras, Sérgio Renato Noguez;Oliveira, José Luis Ruas;Moraes, Paulo Roberto Rocha;Bager, Alex;
Ciência e Agrotecnologia , 2006, DOI: 10.1590/S1413-70542006000500027
Abstract: the nitrogen is derivates in water presence indicates active biological processes influenced by organic pollution, being able, in high concentrations, to cause physiological damages, even mortality in aquatic organisms. in order to determine the lethal effect of the un- ionized ammonia and of the nitrite, fingerlings of cará (cichlasoma facetum) have been exposed, during 96 hours, to diverse concentrations of such composites: from 0 to 4.60 mg.l-1 of nh3 n, and from 0 to 6.68 mg.l-1 of no2. the calculated cl50, for 96 hours, was 2.95 mg.l-1 of un-ionized ammonia. the highest concentration of nitrite, 6.68 mg.l-1, caused the mortality of 45.63% of the fingerlings of cará in 96 hours. the factorial analysis of the mortality variance in relation to the concentration of agents, showed the interaction between both products, resulting the increase of mortality of fingerlings of cará.
Macroinvertebrados bent nicos como indicadores de qualidade de água na Barragem Santa Bárbara, Pelotas, RS, Brasil
Piedras Sérgio Renato Noguez,Bager Alex,Moraes Paulo Roberto Rocha,Isoldi Loraine André
Ciência Rural , 2006,
Abstract: O objetivo deste trabalho foi estudar o impacto de dois afluentes da barragem Santa Bárbara sobre o ambiente da mesma, utilizando a ocorrência de invertebrados bent nicos e características químicas da água. Durante nove meses foram realizadas coletas e análises da água e de invertebrados bent nicos nos afluentes Sanga da Barbuda e Sanga do Passo do Cunha e também no interior da bacia de acumula o da barragem. Os resultados mostram que, embora a Sanga da Barbuda e a Sanga do Passo do Cunha apresentem características químicas abaixo do recomendável, no limite aceitável pela legisla o que determina os padr es de qualidade da água para abastecimento público, estes afluentes est o, ainda, sendo diluídos de forma satisfatória na bacia de acumula o da barragem. O estudo das rela es entre variáveis químicas e invertebrados bent nicos mostra haver correla o significativa entre os baixos níveis de oxigênio dissolvido e a presen a de Oligochaeta, sendo que o aumento do número de Oligochaeta indica uma situa o de anoxia na barragem Santa Bárbara.
Lethal concentration (CL50) of un-ionized ammonia for pejerrey larvae in acute exposure
Piedras, Sérgio Renato Noguez;Pouey, Juvêncio Luís Osório Fernandes;Moraes, Paulo Roberto Rocha;Cardoso, Daniela Fen?on;
Scientia Agricola , 2006, DOI: 10.1590/S0103-90162006000200011
Abstract: ammonia results from decomposition of effluents organic matter, e.g. feed wastes and fish faeces. its un-ionized form can be toxic because diffuses easily through fish respiratory membranes, damaging gill epithelium and impairing gas exchanges. the objective of this work was determining the 96-hour cl50 of un-ionized ammonia for newly hatched pejerrey odontesthes bonariensis larvae. trials were set up completely randomized design, with three different concentration of un-ionized ammonia (0.57, 0.94, and 1.45 mg l-1 nh3-n) and a control treatment (n = 3). experimental units were 20-l, aerated aquaria stocked with 20 larvae (average weight 3.9 mg). pejerrey larvae exposed to un-ionized ammonia during 96 hours present 50% mortality at 0.71 mg l-1 nh3-n.
Survival of embryos of pejerrey Odontesthes bonariensis and Odontesthes humensis at different concentration of salinity
Sérgio Renato Noguez Piedras,Juvêncio Luís Osório Fernandes,Isadora Sobral Motoyama,Gabriel Bernardes Martins
Biotemas , 2009,
Abstract: Embryos of Odontesthes bonariensis and Odontesthes humensis were submitted to saline concentrations of 0, 5, 10, 20 and 30g.L-1. The control of mortality was made daily between the 8th and 12th days of incubation, at the which time the embryos had completed UTA (accumulated thermal units) of the hatching stage. The survival of O. bonariensis embryos did not present any significant variation at salinities between zero and 20g.L1, but at a salinity of 30g.L1, all embryos died. Odontesthes humensis showed better survival at intermediary salinity, between 0 and 10g.L1, suggesting that this species is less tolerant to salinity variation than O. bonariensis.
Lethal concentration (CL50) of un-ionized ammonia for pejerrey larvae in acute exposure
Piedras Sérgio Renato Noguez,Pouey Juvêncio Luís Osório Fernandes,Moraes Paulo Roberto Rocha,Cardoso Daniela Fen?on
Scientia Agricola , 2006,
Abstract: Ammonia results from decomposition of effluents organic matter, e.g. feed wastes and fish faeces. Its un-ionized form can be toxic because diffuses easily through fish respiratory membranes, damaging gill epithelium and impairing gas exchanges. The objective of this work was determining the 96-hour CL50 of un-ionized ammonia for newly hatched pejerrey Odontesthes bonariensis larvae. Trials were set up completely randomized design, with three different concentration of un-ionized ammonia (0.57, 0.94, and 1.45 mg L-1 NH3-N) and a control treatment (n = 3). Experimental units were 20-L, aerated aquaria stocked with 20 larvae (average weight 3.9 mg). Pejerrey larvae exposed to un-ionized ammonia during 96 hours present 50% mortality at 0.71 mg L-1 NH3-N.
Macroinvertebrados bent?nicos como indicadores de qualidade de água na Barragem Santa Bárbara, Pelotas, RS, Brasil
Piedras, Sérgio Renato Noguez;Bager, Alex;Moraes, Paulo Roberto Rocha;Isoldi, Loraine André;Ferreira, Otoniel Geter Lauz;Heemann, Christiane;
Ciência Rural , 2006, DOI: 10.1590/S0103-84782006000200020
Abstract: the objective of this work was to study the impact of two tributaries from the santa bárbara dam on this environment using the occurrence of zoobenthics and some water chemical characteristics. monthly gathering and analysis from the water and zoobenthics were done during nine months in the tributaries sanga da barbuda and sanga passo do cunha as well as in the inner part of the accumulation basin in the santa barbara dam. the results demonstrate that, though sanga da barbuda and sanga passo do cunha present chemical characteristics lower than the recommended but still in the limits acceptable by the law that regulates the water quality standards for the supply, these tributaries are being diluted in a satisfactory way in the accumulation basin in the santa barbara dam. the study of the relations between chemical variables and zoobenthics show a significant correlation between low levels of dissolved oxygen and the presence of oligochaeta; moreover, the increase of oligochaeta indicates a situation of anoxia in the santa barbara dam.
Probiotic actions of Bacillus cereus var. toyoi and Saccharomyces boulardii in silver catfish (Rhamdia quelen) larvae culture
Souza, Diego Moreira de;Martins, Gabriel Bernardes;Piedras, Sérgio Renato Noguez;Pouey, Juvêncio Luís Osório Fernandes;Robaldo, Ricardo Berteaux;Leite, Fabio Pereira Leivas;
Revista Brasileira de Zootecnia , 2012, DOI: 10.1590/S1516-35982012000300048
Abstract: the objective of this study was to evaluate the use of bacillus cereus var. toyoi and saccharomyces boulardii as probiotics to improve rhamdia quelen culture. six hundred larvaes (0.16±0.07 g) were divided in three replicate tanks (25-l recirculation, 20 oc, photoperiod of 12 h light/12 h darkness) per treatment and were randomly assigned to the following treatments: bacillus cereus var. toyoi; saccharomyces boulardii; b. toyoi and s. boulardii; and control (without probiotic addition) for a period of 30 days. the fish were fed five times daily (56% crude protein - supra alevino inicial?) and the probiotics were applied in water once a day. the doses of probiotics were 5 × 108 and 2 × 109 cfu (colony forming unit)/ml for b. cereus var. toyoi and s. boulardii, respectively. both probiotics have an inhibitory effect in vitro against vibrio carchariae and are able to grow in media prepared with fishery water; however, no effect was observed on growth parameters when they were administered to rhamdia quelen larvae.
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