ABSTRACT Light is a determining factor in plant morphophysiology, as it influences the growth and development of agricultural crops. Thus, the objective was to investigate the effects of light sources on the growth and development of “biquinho” pepper cultivars. The experiment was performed in two stages (Exp1 and Exp2), evaluating two cultivars (BRS Moema; Airetama biquinho) in five light sources (white LEDs, red LEDs, blue LEDs, red/blue LEDs, and fluorescent lamps). In Exp1 the plants were kept in a controlled condition, with a completely randomized design, in a 2x5 factorial scheme (cultivars x light sources) until 76 days after emergence (DAE), in which growth variables and photosynthetic pigments were evaluated. In Exp2, the plants were removed from the above conditions and transplanted in pots, being kept in greenhouse for more 76 DAE. At 152 DAE, the same variables as Exp1 were evaluated, as well as gain of shoot fresh and dry mass, and gain of root fresh and dry mass. In both experiments, growth variables were affected by cultivar and the light sources, however, the behavior did not follow the same trend for all variables, indicating that the light quality influences the growth of the crops, and impacting during greenhouse conditions.

Summary: Despite restoration efforts, Mexico loses on average 500 000 ha of temperate forests annually, releasing the carbon stored in plant tissues, leaf litter, and soils into the atmosphere. Much of the temperate forests of Mexico grow on volcanic soils (Andosols), which cover approximately 1.2% of the country’s area. However, little information is available on how much carbon is stored in soil, leaf litter, and arboreal components of these systems. Therefore, the objective of this study was to determine organic carbon concentration in trees, litter, and soil in “El Faro” Protected Natural Area in Tlalmanalco, Estado de Mexico. This research selected eight study sites under four tree-cover categories: Cupressus-Pinus, Pinus-Quercus, Quercus-Pinus and Quercus, and determined species and normal diameter (DN) of trees with DN larger than 10 cm, samples of leaf litter and soil were collected at a depth of 0-20 cm. Soil organic carbon (SOC) concentration was determined in the laboratory in an elemental analyzer, as well as bulk density, porosity, and rock volume. Total carbon stored by trees was estimated using species-specific allometric formulas. The average total carbon content was 185.34 Mg ha-1, with an overall average of 56.40 Mg ha-1 in trees, 44.91 Mg ha-1 in leaf litter, and 84.03 Mg ha-1 in soil. The tree cover storing the most carbon in vegetation was Pinus-Quercus, with 71.74 Mg ha-1, and across all the study sites a positive correlation was recorded between total Quercus tree biomass and SOC. This result was probably due to faster accumulation and decomposition of Quercus leaf litter compared to pine needles. Based on the estimates of this study, 50 ha of El Faro protected natural area stored a total of 9267 Mg of carbon that could be released if the area were deforested, evidencing the importance of its conservation.

Resumen: A pesar de algunos esfuerzos de reforestación, México pierde alrededor de 500 000 ha de bosques templados anualmente, lo cual libera a la atmósfera el carbono contenido en el tejido vegetal, mantillo y suelos. Gran parte de estos bosques se encuentran en suelos de origen volcánico que ocupan el 1.2% del territorio nacional, pero existe poca información acerca del almacenamiento de carbono en suelos, mantillo y vegetación arbórea sobre estos suelos. Por esto, el objetivo de esta investigación fue determinar las concentraciones de carbono orgánico en el arbolado, mantillo y suelos en el área natural protegida (ANP) El Faro en Tlalmanalco, Edo. de México. Se seleccionaron ocho sitios de muestreo bajo cuatro categorías de cobertura arbórea: Cupressus-Pinus, Pinus-Quercus, Quercus-Pinus y Quercus. Se determinó la especie y el diámetro normal (DN) de los árboles mayores a 10 cm de DN, se colectaron muestras de mantillo y de suelo de 0 a 20 cm de profundidad. En laboratorio, se determinaron las concentraciones de carbono orgánico del suelo (COS), densidad aparente, porosidad, y volumen de rocas. Se estimó el carbono total en arboles por especie con base en fórmulas alométricas. Se almacena en promedio 185.34 Mg ha-1 en total: 56.40 Mg ha-1 en la vegetación arbórea, 44.91 Mg ha‑1 en mantillo y 84.03 Mg ha-1 en suelo. La cobertura arbórea Pinus-Quercus almacena más carbono en el arbolado con 71.74 Mg ha-1, y entre todos los sitios existe una correlación positiva entre la biomasa arbórea total de Quercus con el COS. Esto probablemente se debe a la acumulación y descomposición más rápida de su hojarasca comparado con las acículas de Pinus spp. Estimamos que se almacena un total de 9267 Mg de carbono en las 50 ha de bosque templado del ANP El Faro, contenido que se liberaría si el área se deforesta, evidenciando la importancia de su conservación.

ABSTRACT Objective: To determine the incidence and the clinical, bacteriological and cerebrospinal fluid characteristics of neonatal meningitis in Lima hospitals. Materials and methods: An observational, multicenter study was conducted in six hospitals in the city of Lima during 1 year of epidemiological surveillance. Results: The cumulative hospital incidence was 1.4 cases per 1000 live births. A total of 53 cases of neonatal meningitis were included, 34% (18/53) were early and 66% (35/53) late. The associated maternal factors were meconium-stained amniotic fluid and urinary tract infection. Insufficient prenatal check-ups were found in 58.8% (30/51). The most associated neonatal factor was sepsis. The main symptoms were fever, irritability, hypoactivity and respiratory distress. Pleocytosis in cerebrospinal fluid (CSF) was significant, without predominance of polymorphonuclear lymphocytes (PMN), hypoglycorrhagia and proteinorrhagia. The most frequent pathogens isolated were Escherichia coli and Listeria monocytogenes. Conclusions: The hospital incidence of neonatal meningitis was 1.4 per 1000 live births, being ten times higher in preterm infants. Breathing difficulty was the most frequent symptom in the early stage, while fever and irritability in the late stage. CSF showed pleocytosis without predominance of PMN. The most frequent germs were Escherichia coli and Listeria monocytogenes. Ventriculitis and hydrocephalus were the most common neurological complications.

RESUMEN Objetivo: Determinar la incidencia y las características clínicas, bacteriológicas y del líquido cefalorraquídeo de la meningitis neonatal en hospitales de Lima. Materiales y métodos: Se realizó un estudio observacional, multicéntrico en seis hospitales de la ciudad de Lima, con una vigilancia epidemiológica durante un año. Resultados: La incidencia acumulada hospitalaria fue de 1,4 casos por mil nacidos vivos. Fueron incluidos 53 casos de meningitis neonatal, 34% (18/53) fueron tempranos y 66% (35/53) tardíos. Los factores maternos asociados fueron líquido amniótico meconial e infección de tracto urinario. El 58,8% (30/51) presentó controles prenatales insuficientes. El factor neonatal más asociado fue sepsis. Los principales síntomas fueron fiebre, irritabilidad, hipoactividad y dificultad respiratoria. En el líquido cefalorraquídeo (LCR) se destacó la pleocitosis, sin predominio de polimorfonucleares (PMN), hipoglucorraquia y proteinorraquia. Los patógenos aislados con mayor frecuencia fueron Escherichia coli y Listeria monocytogenes. Conclusiones: La incidencia hospitalaria de meningitis neonatal fue de 1,4 por mil nacidos vivos, siendo diez veces mayor en prematuros. La dificultad respiratoria fue el síntoma más frecuente en la forma temprana, mientras que la fiebre e irritabilidad en la forma tardía. El LCR mostró pleocitosis sin predominio de PMN. Los gérmenes más frecuentes fueron Escherichia coli y Listeria monocytogenes. La ventriculitis e hidrocefalia fueron las complicaciones neurológicas más comunes.

ABSTRACT Objective: To determine the incidence and the clinical, bacteriological and cerebrospinal fluid characteristics of neonatal meningitis in Lima hospitals. Materials and methods: An observational, multicenter study was conducted in six hospitals in the city of Lima during 1 year of epidemiological surveillance. Results: The cumulative hospital incidence was 1.4 cases per 1000 live births. A total of 53 cases of neonatal meningitis were included, 34% (18/53) were early and 66% (35/53) late. The associated maternal factors were meconium-stained amniotic fluid and urinary tract infection. Insufficient prenatal check-ups were found in 58.8% (30/51). The most associated neonatal factor was sepsis. The main symptoms were fever, irritability, hypoactivity and respiratory distress. Pleocytosis in cerebrospinal fluid (CSF) was significant, without predominance of polymorphonuclear lymphocytes (PMN), hypoglycorrhagia and proteinorrhagia. The most frequent pathogens isolated were Escherichia coli and Listeria monocytogenes. Conclusions: The hospital incidence of neonatal meningitis was 1.4 per 1000 live births, being ten times higher in preterm infants. Breathing difficulty was the most frequent symptom in the early stage, while fever and irritability in the late stage. CSF showed pleocytosis without predominance of PMN. The most frequent germs were Escherichia coli and Listeria monocytogenes. Ventriculitis and hydrocephalus were the most common neurological complications.

RESUMEN Objetivo: Determinar la incidencia y las características clínicas, bacteriológicas y del líquido cefalorraquídeo de la meningitis neonatal en hospitales de Lima. Materiales y métodos: Se realizó un estudio observacional, multicéntrico en seis hospitales de la ciudad de Lima, con una vigilancia epidemiológica durante un año. Resultados: La incidencia acumulada hospitalaria fue de 1,4 casos por mil nacidos vivos. Fueron incluidos 53 casos de meningitis neonatal, 34% (18/53) fueron tempranos y 66% (35/53) tardíos. Los factores maternos asociados fueron líquido amniótico meconial e infección de tracto urinario. El 58,8% (30/51) presentó controles prenatales insuficientes. El factor neonatal más asociado fue sepsis. Los principales síntomas fueron fiebre, irritabilidad, hipoactividad y dificultad respiratoria. En el líquido cefalorraquídeo (LCR) se destacó la pleocitosis, sin predominio de polimorfonucleares (PMN), hipoglucorraquia y proteinorraquia. Los patógenos aislados con mayor frecuencia fueron Escherichia coli y Listeria monocytogenes. Conclusiones: La incidencia hospitalaria de meningitis neonatal fue de 1,4 por mil nacidos vivos, siendo diez veces mayor en prematuros. La dificultad respiratoria fue el síntoma más frecuente en la forma temprana, mientras que la fiebre e irritabilidad en la forma tardía. El LCR mostró pleocitosis sin predominio de PMN. Los gérmenes más frecuentes fueron Escherichia coli y Listeria monocytogenes. La ventriculitis e hidrocefalia fueron las complicaciones neurológicas más comunes.

RESUMO: O objetivo deste estudo foi caracterizar a produção de pimenta biquinho através da interpretação dos parâmetros do modelo Logístico e seus pontos críticos obtidos pelas derivadas parciais da função, bem como indicar qual a melhor cultivar e a melhor época de cultivo para locais de clima subtropical. Conduziu-se um experimento em esquema fatorial 2x3 sendo duas cultivares de pimenta biquinho (BRS Moema e Airetama biquinho), em três épocas de cultivo (E1: outubro de 2015, E2: 01 de novembro 2015 e E3: janeiro de 2016). Ajustou-se o modelo logístico para massa de frutos em função da soma térmica acumulada, e calculou-se os pontos críticos através das derivadas parciais do modelo com a finalidade de caracterizar o desempenho produtivo da cultura através da interpretação biológica destes parâmetros. Temperaturas próximas a 0 ºC durante o experimento foram letais às plantas, e por isso, para a época 3, ajustou-se um modelo de regressão linear. A interpretação dos parâmetros do modelo Logístico e seus pontos críticos permitiram que a produção das cultivares nas épocas 1 e 2 fossem caracterizadas, sendo que a cultivar mais produtiva é Airetama biquinho em todas as épocas de transplante. Essa cultivar também apresenta maior concentração de produção no período. Quanto a precocidade produtiva as duas cultivares não diferiram significativamente. Sobre a época 3, não foi possível interpretar da mesma forma, pois o ajuste do modelo linear não permite as mesmas interpretações realizadas para o modelo não linear, reafirmando a sua aplicabilidade em cultura olerícolas de múltiplas colheitas.

ABSTRACT: The objective of this study was to characterize the production of biquinho pepper through the interpretation of parameter estimates from the logistic model and its critical points obtained by the partial derivatives of the function, and to indicate the best cultivar and growing season for subtropical climate sites. For this, a 2x3 factorial experiment was conducted with two cultivars of biquinho pepper (BRS Moema and Airetama biquinho) in three growing seasons (E1: October 2015, E2: November 2015, E3: January 2016). The logistic non-linear model for fruit mass was specified as a function of the accumulated thermal sum, and the critical points were calculated through the partial derivatives of the model, in order to characterize the productive performance of the crop by the biological interpretation of the estimates of the three set parameters. In E3, temperatures close to 0 ºC during the experiment were lethal to the plants, and a linear regression model was used in this case. The production of the cultivars in E1 and E2 were well characterized by the estimated logistic models, and the most productive cultivar was Airetama biquinho in all evaluated seasons. This cultivar also presented higher concentration of production. The two cultivars did not differ significantly with regards to productive precocity. For E3, it was not possible to interpret the parameters in the same way as for E1 and E2, since the use of the linear model did not allow the same interpretations performed for the nonlinear model, reaffirming its applicability horticultural crops of multiple harvests.

RESUMO O objetivo deste trabalho foi determinar a temperatura base da chicória e aplicá-la na análise fenológica da cultura, durante quatro períodos de cultivo. O trabalho foi realizado com a cultura da chicória (Chicorium endivia) cultivar Escarola Lisa, na Universidade Federal de Santa Maria, campus Frederico Westphalen-RS. O experimento foi conduzido em delineamento de blocos ao acaso com quatro períodos de cultivo (P1: 15/2/2015; P2: 29/04/2015, P3: 22/07/2015, P4: 16/10/2015) em 10 repetições, com uma planta por repetição. As avaliações consistiram da contagem do número de folhas, realizada três vezes por semana após transplante até o ponto de colheita. Para determinação de temperatura base utilizaram-se os métodos desvio padrão em graus dias (DPgd), desvio padrão em dias (DPd), coeficiente da variação em graus dias (CVgd), coeficiente de variação em dias (CVd), coeficiente de regressão (CR), X-intercepto. Desta forma, a temperatura base para emissão de duas folhas sucessivas na escarola é de 4,7°C, obtida através dos valores de 4,0 e 5,5°C, observados nos métodos DPgd e CR. Para a emissão de duas folhas é necessário entre 16,6 e 27,8°C dia folha-1.

ABSTRACT The objective of this study was to determine the base temperature of escarole and to apply in the phenological analysis of crop during four growing periods. The study was carried out with escarole (Chicorium endivia) ‘Escarola Lisa’ cultivar, at the Federal University of Santa Maria, campus Frederico Westphalen-RS. The experiment was performed in a randomized block design with four sowing periods (P1: 2/15/2015; P2: 04/29/2015, P3: 07/22/2015, P4: 10/16/2015) and 10 replicates, each replicate being one plant. The evaluations consisted of counting the number of leaves, performed three times a week after transplanting date until the harvesting point. To determine the base temperature, the following methods were used: standard deviation in degree-days (SDgd), standard deviation in days (SDd), coefficient of variation in degree-days (CVgd), coefficient of variation in days (CVd), regression coefficient (RC) and X-intercept. The base temperature for emission of two successive leaves in the escarole is 4.7°C, obtained by values of 4.0 and 5.5°C, observed in the SDgd and RC methods. For two leaves emission, the temperature between 16.6 and 27.8°C day leaf-1 is necessary.

ABSTRACT To assess the percentage of clay present in rock formations is one of the first steps in estimating the volume of oil that can be extracted from a well. For the petrophysical evaluation of formations, along with data being taken directly from the well through the geophysical logs, software applications are used allowing to process data to obtain interpretations, new properties that cannot be read directly from the well and also to display the information for further analysis. This work aims to allow users to adjust parameters for calculating volume of clay through modules that show graphical information in the System Analysis and Interpretation of Oil Well Logs. To develop this work, scientific methods such as analytic-synthetic, modeling and observation were used. In addition, the RUP, UML modeling language, the CASE tool Visual Paradigm, the programming language C + + and Qt as a development framework and the QT Creator as development environment were used. As a result, a mechanism facing a change in the calculation parameters introduced by the user was obtained, which is able to recalculate the results and display them immediately. With the integration of graphic rendering engine to the System Analysis and Interpretation of Oil Well Logs makes possible that the process of interpretation carried out by the user to be done in a more interactive way.

RESUMEN Calcular el valor porcentual de arcilla presente en las formaciones de rocas es uno de los primeros pasos en la estimación del volumen de hidrocarburos que puede ser extraídos por un pozo determinado. En la evaluación petrofísica de formaciones son empleados de conjunto: los datos tomados directamente en el pozo mediante los registros geofísicos, y aplicaciones informáticas que permiten procesar estos datos para realizar interpretaciones, cálculo de nuevas propiedades que no pueden ser leídas directamente del pozo y visualización de la información para el análisis de la misma. El presente trabajo tiene como objetivo desarrollar un motor de interpretación gráfica, que permita realizar ajustes de los parámetros de cálculo de volumen de arcilla a través de los módulos que muestran información gráfica en el Sistema de Análisis e Interpretación de Registros de Pozos de Petróleo. Para desarrollar este trabajo se utilizaron métodos científicos como el analítico-sintético, modelado y observación. Además, se utilizó el Rational Unified Process, lenguaje de modelado UML, la herramienta CASE Visual Paradigm, el lenguaje de programación C++ y como marco de desarrollo Qt, y como entorno de desarrollo QT Creator. Como resultado se obtuvo un mecanismo que ante un cambio en los parámetros de cálculo realizado por el usuario es capaz de recalcular los resultados y mostrar los mismos de manera inmediata. La integración del motor de interpretación gráfica al Sistema de Análisis e Interpretación de Registros de Pozos de Petróleo logra que el proceso de interpretación que realiza el usuario sea más interactivo.

El Virus de Papiloma Humano (VPH) representa una de las enfermedades de trasmisión sexual más frecuente, según su riesgo oncológico es clasificado de alto y bajo riesgo, siendo los primeros posibles carcinógenos para el ser humano. La mayoría de las pacientes expuestas expresan un solo genotipo, pero se han encontrado casos donde coexisten dos o más subtipos, lo cual podría traducirse en un riesgo mayor de desarrollar cáncer cervical. Se propuso la revisión de los casos con diagnóstico citológico y anatomopatológico positivo de infección por VPH, con positividad a la PCR (reacción en cadena de la polimerasa). Se evaluaron 950 pacientes a las que se les realizó PCR de cuello uterino por hisopado o tejido cervical. Se concluye que de la totalidad de la muestra estudiada 99% fueron PCR positivas al VPH (p 0,01), 50% tenían genotipo considerado de alto riesgo oncogénico, 15% de ellas expresaron infección múltiple por dos o más cepas (31 y 6, la más frecuente), y sólo una de las pacientes presentó positividad al 31, 45 y 6, con cambios epiteliales compatibles a LIE (Lesión intraepitelial) de alto grado. La tipificación por PCR en combinación con el estudio anatomopatológico, son importantes pruebas complementarias en el diagnóstico de la enfermedad, ya que, permiten determinar la gravedad de la misma al precisar su riesgo oncogénico dependiendo del genotipo de VPH detectado en relación con el tipo de lesión histológica observada.

The Human Papilloma Virus (HPV) is one of the most common diseases of sexual transmission, according to the cancer risk is classified high and low risk, with the first possibly carcinogenic to humans. Most patients exposed express a single genotype but found cases where there are two or more subtypes, which could lead to an increased risk of developing cervical cancer. The review of cases with positive cytologic diagnosis and pathology of HPV infection, with positivity to PCR (polymerase chain reaction) was proposed. The 950 patients who underwent PCR cervix or swabbing the cervix are evaluated. We conclude that the entire sample studied 99% were positive for HPV (p 0.01), 50% had genotype PCR considered high oncogenic risk, 15% of them expressed multiple infection by two or more strains (31 and 6 the most common), and only one of the patients had positive 31, 45 and 6, epithelial changes compatible to LIE (intraepithelial lesion) high degree. For HPV typing by PCR in combination with pathologic examination, additional tests are important in diagnosing the disease as possible to determine the severity of it to clarify its oncogenic risk depending on the genotype HPV detected in relation to the type of histological lesions observed.

Oil is non-renewable natural resource used to produce a high percentage of energy in the world today. Because of its importance and usefulness is mined in almost all the countries of America. In Cuba for the exploration of this precious resource, automated systems are used, which among its features provide analyze, evaluate and edit the information contained in the files of oil well logs. These automated systems are a great help in the analysis and interpretation of such information, providing greater accuracy and speed in processing. But for Cuba, the use of these systems is not feasible due to the high cost required to obtain and use them, besides it can only be run on Windows operating system. The present work aims to enable the analysis of information contained in the files of oil well logs through the histogram display, plots and cross plots. It was developed using scientific methods such as the Analytic-Synthetic, Modeling, Observation and Interview. In addition, we used the RUP, UML modeling language, the CASE tool Visual Paradigm, the programming language C++ as the development framework Qt framework like QT Creator development environment and a library Qwt5 graphed. The result of this work was the implemented module, besides the requirements engineering and a business model from the analysis of information contained in oil well logs.

El petróleo es un recurso natural no renovable utilizado para producir un alto porcentaje de la energía que se consume en el mundo. Debido a su importancia y utilidad se extrae en casi todos los países de América. En Cuba se utilizan para la exploración de este preciado recurso, sistemas automatizados, que entre sus características permiten analizar, evaluar y modificar la información contenida en los archivos de registros de pozos de petróleo. Estos sistemas automatizados son una gran ayuda en el análisis e interpretación de la información contenida en los registros de pozos, proporcionando una mayor precisión y velocidad en el procesamiento. Pero para Cuba, el uso de estos sistemas no es factible debido al elevado costo requerido para utilizarlos, además, que sólo se pueden ejecutar en el sistema operativo Windows. El presente trabajo tiene el objetivo de permitir el análisis de la información contenida en los archivos de registros de pozo de petróleo a través de la visualización de histogramas, cross-plot y pistas. Para desarrollar este trabajo se emplearon los métodos científicos: analítico-sintético, modelado, observación y entrevista. Además, se utilizó la metodología RUP, lenguaje de modelado UML, la herramienta CASE Visual Paradigm, el lenguaje de programación C++ y el marco de desarrollo Qt, como entorno de desarrollo QT Creator y la biblioteca Qwt5. Como resultado de este trabajo, además del módulo implementado, se obtuvo la ingeniería de requisitos y análisis del modelo de negocio de la información contenida en los registros de pozos de petróleo.

Determining the volume of oil that can be extracted for a given well is vital for the oil industry. In the petrophysical evaluation of training set are used : data taken directly in the well using geophysical logs and process applications that allow these data to make interpretations , calculation of new properties that cannot be read directly from the well and display the information for analysis of the same . The present work aims to enable the development and execution of user programs for calculating petrophysical parameters in the System Analysis and Interpretation of Oil Well Records. To develop this work using scientific methods such as analytic-synthetic, modeling and observation. In addition, we used the RUP, UML modeling language, the CASE tool Visual Paradigm, the programming language C and as Qt development framework, and as a development environment for QT Creator. The result was the interpreter of user programs and a code editor with syntax highlighting, completion and to make the development process more user-friendly programs. With the integration of the interpreter to System Analysis and Interpretation of Oil Well Logging is done that it is better suited to the needs of each individual user.

La determinación del volumen de hidrocarburos que pueden ser extraídos por un pozo determinado de vital importancia para la industria petrolera. En la evaluación petrofísica de formaciones son empleados de conjunto: los datos tomados directamente en el pozo mediante los registros geofísicos, y aplicaciones informáticas que permiten procesar estos datos para realizar interpretaciones, cálculo de nuevas propiedades que no pueden ser leídas directamente del pozo y visualización de la información para el análisis de la misma. El presente trabajo tiene como objetivo permitir el desarrollo y ejecución de programas de usuario para el cálculo de parámetros petrofísicos en el Sistema de Análisis e Interpretación de Registros de Pozos de Petróleo. Para desarrollar este trabajo se utilizaron métodos científicos como el analítico-sintético, modelado y observación. Además, se utilizó el RUP, lenguaje de modelado UML, la herramienta CASE Visual Paradigm, el lenguaje de programación C++ y como marco de desarrollo Qt, y como entorno de desarrollo de QT Creator. Como resultado se obtuvo el intérprete de programas de usuario y un editor de código con completamiento y resaltado de sintaxis para hacer el proceso de desarrollo de los programas más amigable al usuario. Con la integración del intérprete al Sistema de Análisis e Interpretación de Registros de Pozos de Petróleo se logra que el mismo se adapte mejor a las necesidades de cada usuario en particular.

It is important to search for sustainable alternatives with byproducts for replacing fish meal in diets for weight gain in red tilapia (Oreochromis spp.) cultured in floating cages at 27.8 °C. In the present study, four isoprotein diets (26 %) (treatments: T; 0 %, T0; 14 % T14; 16 % T16, and 18 % T18) and isoenergetic diets (2.7 kcal g-1 feed) were formulated, using a by-product mixture of sugar cane, enriched with acid fish-silage (sugar cane protein meal) as substitution of fish meal. Four hundred and twenty tilapia males (58.34±0.01 g) were used in this study, fed for 60 d. The experimental design was completely randomized with seven rectangular cages per treatment (0.256 m³; 0.8X0.8X0.4 m) left hanging above a circular concrete pond (8 m diameter and 2 m high) with 15 fish per cage. Data analysis, conducted by a one way analysis of variance, indicated that for T0 and T14 there were no significant differences (p>0.05) in final weight, growth rate, protein efficiency rate, factor of conversion and feed efficiency. The fish in treatments T16 and T18, however, showed less performance. We conclude that up to 14 % of sugar cane protein meal may be included in diets for weight gain in red tilapia without affecting productive indicators.

Es importante buscar alternativas sostenibles con subproductos para sustituir la harina de pescado en dietas para la engorda de tilapia roja (Oreochromis spp.) cultivadas en jaulas flotantes a 27.8 °C. En el presente estudio se formularon cuatro dietas (tratamientos, T; 0 %, T0; 14 %, T14; 16 %, T16 y 18 %, T18) isoproteínicas (26 %) e isoenergéticas (2.7 kcal g-1 alimento) usando una mezcla de subproducto de caña proteínica enriquecido con ensilaje ácido de pescado (harina de caña proteínica) en sustitución de harina de pescado. En este estudio se usaron 420 machos de tilapias (58.34±0.01 g) alimentados por 60 d. El diseño experimental fue completamente al azar con siete jaulas rectangulares por tratamiento (0.256 m³; 0.8X0.8X0.4 m) y suspendidas sobre un estanque circular de hormigón (8 m diámetro y 2 m alto), con 15 peces por jaula. El análisis de los datos, efectuado mediante un análisis de varianza de una vía, indicó que para T0 y T14 no hubo diferencias significativas (p>0.05) en peso final, tasa de crecimiento, tasa de eficiencia proteínica, factor de conversión y eficiencia alimenticia. Sin embargo, los peces en los tratamientos T16 y T18 mostraron un menor desempeño. Se concluye que se puede incluir hasta 14 % de la harina de caña proteínica en dietas para la engorda de tilapia roja sin afectar los indicadores productivos.