Eduardo Pérez - Academia.edu (original) (raw)
Papers by Eduardo Pérez
Icml, 1996
... INPROCEEDINGS{Perez96learningdespite, author = {Eduardo Perez and Larry ... 1 MOTIVATION Beca... more ... INPROCEEDINGS{Perez96learningdespite, author = {Eduardo Perez and Larry ... 1 MOTIVATION Because there is no hope of finding a universal learner (Watanabe, 1985; Schaffer, 1994; Rao, Gordon, & Spears, 1995), it is important to discover the conditions that favor a given ...
Medicina, 2005
HIV patient hospitalization during the pre and post-HAART era. The purpose of this study was to d... more HIV patient hospitalization during the pre and post-HAART era. The purpose of this study was to describe and to compare the characteristics of patient admissions during two periods, one pre HAART and the other when HAART was fully available. A retrospective analysis of demographic data, ambulatory care informa- tion and hospitalization characteristics was performed. Causes of admission, outcome, mortality, length
Med Clin, 2007
No existen estudios epidemiológicos sobre la incidencia de miopatía inflamatoria en España. El ob... more No existen estudios epidemiológicos sobre la incidencia de miopatía inflamatoria en España. El objetivo de este estudio fue determinar las tasas de incidencia de dermatomiositis y polimiositis y su distribución en el territorio español.Estudio descriptivo observacional a partir de los datos del Conjunto Mínimo Básico de Datos de Altas Hospitalarias en el período 1997-2004. Se analizaron las variables sexo, comunidad autónoma y edad. Se calcularon las tasas de incidencia de hospitalización en casos por millón de habitantes y año brutas y estandarizadas y su intervalo de confianza (IC) del 95%, en total y por comunidad autónoma. Para el análisis de tendencia del período estudiado, se calculó la odds ratio (OR) de tendencia mediante regresión logística.La tasa de incidencia total del conjunto de dermatomiositis y polimiositis fue de 8,9 (IC del 95%, 8,6-9,2) nuevos casos por millón de habitantes y año; la de polimiositis, 3,9 (IC del 95%, 3,7-4,1), y la dermatomiositis, 4,9 (IC del 95%, 4,7-5,2). La diferencia entre las tasas de ambas enfermedades fue estadísticamente significativa (p < 0,001). La tasa de incidencia anual de ambas enfermedades disminuyó de forma significativa durante el período (dermatomiositis, OR de tendencia = 0,95; IC del 95%, 0,93-0,97; p < 0,001; polimiositis, OR = 0,96; IC del 95%, 0,93-0,97; p < 0,001). La incidencia de ambas enfermedades fue significativamente superior en mujeres. Las tasas de incidencia de polimiositis oscilaban en las diferentes comunidades autónomas entre 2,2 y 10,6 casos por millón de habitantes y año y las de la dermatomiositis, entre 2,9 y 8,6 casos por habitantes y año.La incidencia de dermatomiositis y polimiositis en España es similar a la observada en otras zonas del mundo. La disminución de la incidencia mantenida a lo largo del período y la incidencia más alta de dermatomiositis podrían explicarse por una mejor categorización de estas enfermedades.Epidemiologic studies of polymyositis-dermatomyositis incidence in Spain are lacking. The aim of the study was to determine the incidence rates of dermatomyositis-polymyositis and their distribution in our country.Observational and descriptive study. Data was obtained from hospital discharge code (CMBD) during the period 1997-2004. Sex, region and age were analysed. Raw and standardized incidence rates for each region studied were calculated as new cases/million population/year with 95% confidence interval (CI). Trend odds ratio (OR) was calculated by means of a logistic regression.Global incidence rate in polymyositis-dermatomyositis was 8.9 new cases/million population/ year (CI 95%, 8.6-9.2); 3.9 (CI 95%, 3.7-4.1) for polymyositis and 4.9 (CI 95%, 4.7-5.2) for dermatomyositis. Rate differences between both diseases reached statistical significance (p < 0.001). Annual incidence rate decreased significantly across the period studied in both diseases with a trend OR of 0.95 (CI 95%, 0.93-0.97; p < 0.001) in dermatomyositis and 0.96 (CI 95%, 0.93-0.97; p < 0.001) in polymyositis. Both diseases were significantly more frequent in females (p < 0.001). The incidence rates for each region varies between 2.2 and 10.6 cases/million population/year in polymyositis and between 2.9 and 8.6 cases/million population/ year in dermatomyositis.Incidence of dermatomyositis-polymyositis in Spain is similar to other countries. Decreased incidence observed across the period and the higher incidence of dermatomyositis could be explained because of a better diagnosis of these entities.
![Research paper thumbnail of Bis(tetra-n-butylammonium) di-mu-chloro-bis[(tetramethyl buta-1,3-diene-1,2,3,4-tetracarboxylato-kappa(2)C(1),C(4))palladium]](https://attachments.academia-assets.com/41248204/thumbnails/1.jpg)
](Acta Crystallographica Section C Crystal Structure Communications
The anionic complex in the title compound, (C(16)H(36)N)(2)[Pd(2)(C(12)H(12)O(8))(2)Cl(2)], lies ... more The anionic complex in the title compound, (C(16)H(36)N)(2)[Pd(2)(C(12)H(12)O(8))(2)Cl(2)], lies on a centre of inversion, so that the [Pd(2)(mu-Cl)(2)] core is planar, which is the most frequent conformation found for complexes containing this moiety in the Cambridge Structural Database [October 2001 Release; Allen & Kennard (1993). Chem. Des. Autom. News, 8, 1, 31-37]. This dinuclear complex has a Pd...Pd distance of 3.5119 (4) A. The bite angle of the chelating ligand [79.79 (8) degrees] distorts the square-planar coordination around the metal atom.
International Journal of Nursing, 2015
The aims of this article are: 1) to examine the associations between health provider-diagnosed de... more The aims of this article are: 1) to examine the associations between health provider-diagnosed depression and multimorbidity, the condition of suffering from more than two chronic illnesses; 2) to assess the unique contribution of chronic illness in the prediction of depression; and 3) to suggest practice changes that would address risk of depression among individuals with chronic illnesses. Data collected in a cross-sectional community health study among adult Mexicans (n= 274) living in a low income neighborhood (colonia) in Ciudad Juárez, Chihuahua, Mexico, were examined. We tested the hypotheses that individuals who reported suffering chronic illnesses would also report higher rates of depression than healthy individuals; and having that two or more chronic illnesses further increased the risk of depression.
Un enfoque bioeconómico precautorio
Interciencia
Para el camarón blanco Litopenaeus schmitti se han reportado diferentes parámetros de crecimiento... more Para el camarón blanco Litopenaeus schmitti se han reportado diferentes parámetros de crecimiento en el occidente de Venezuela. Tales diferencias han sido atribuidas tanto a los distintos métodos como a las distintas bases de datos empleadas en la estimación. Para evaluar esta explicación se reanalizaron los parámetros de crecimiento para la especie, utilizando dos bases de datos y dos métodos de ajuste: ELEFAN y una minimización de cuadrados. La primera base de datos consistió de frecuencias de longitudes de juveniles capturados en el Lago de Maracaibo en el periodo 1991-1993. La segunda consistió de frecuencias de longitudes de juveniles y adultos capturados en el Golfo de Venezuela y el Lago de Maracaibo durante el periodo 2001-2003. Para ajustar los parámetros mediante ELEFAN se empleó el software FiSAT, en tanto que para el método de mínimos cuadrados se usaron planillas de cálculo. Los resultados mostraron que los tamaños registrados en las bases de datos tienen un mayor impac...
2008 IEEE International Conference on Acoustics, Speech and Signal Processing, 2008
We present an Active Noise Control (ANC) system that is designed to cancel acoustic noise at high... more We present an Active Noise Control (ANC) system that is designed to cancel acoustic noise at high sound levels. The ANC system is graphically designed using Lab VIEW and implemented on FPGA. NLMS algorithm is used for updating the filter co-efficients. The ANC system is evaluated on a realistic test-bed mimicking an actual fMRI bore. The algorithm is tested for various tonal frequencies in the range from 100 to 5000 Hz and the performance is measured in terms of the noise cancellation. We observe that good noise cancellation (15 to 45 dB SPL) can be obtained with NLMS algorithm over the entire bandwidth.
HIV patient hospitalization during the pre and post-HAART era. The purpose of this study was to d... more HIV patient hospitalization during the pre and post-HAART era. The purpose of this study was to describe and to compare the characteristics of patient admissions during two periods, one pre HAART and the other when HAART was fully available. A retrospective analysis of demographic data, ambulatory care informa- tion and hospitalization characteristics was performed. Causes of admission, outcome, mortality, length
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2005
We describe the design and performance of a hybrid extensive air shower detector array built on t... more We describe the design and performance of a hybrid extensive air shower detector array built on the Campus of the University of Puebla (19 N, 90 W, 800 g=cm 2 ) to measure the energy, arrival direction and composition of primary cosmic rays with energies around 1 PeV, i.e., around the knee of the cosmic ray spectrum. The array consists of 3 water Cherenkov detectors of 1:86 m 2 cross-section and 12 liquid scintillator detectors of 1 m 2 distributed in a square grid with a detector spacing of 20 m over an area of 4000 m 2 . We discuss the calibration and stability of the array for both sets of detectors and report on preliminary measurements and reconstruction of the lateral distributions for the electromagnetic (EM) and muonic components of extensive air showers. We also discuss how the hybrid character of the array can be used to measure mass composition of the primary cosmic rays by estimating the relative contents of muons with respect to the EM component of extensive air showers. This facility is also used to train students interested in the field of cosmic rays. r
Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2002
The humidity correction factors specified by IEC Publication 60-1 (1989) and IEEE Std.-4 (1995) f... more The humidity correction factors specified by IEC Publication 60-1 (1989) and IEEE Std.-4 (1995) for impulse voltages are restricted to 1≤h/δ&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;15. However, values of h/δ≥15 g/m3 in many regions of the world are present. The IEC-60 and the IEEE Std.-4 procedures are based on the macroscopic observation that the atmospheric correction factors are larger when the discharge is governed mainly
Lecture Notes in Computer Science, 2007
When primitive data representation yields attribute inter- actions, learning requires feature con... more When primitive data representation yields attribute inter- actions, learning requires feature construction. MFE2/GA, a GA-based feature construction has been shown to learn more accurately than oth- ers when there exist several complex attribute interactions. A new flt- ness function, based on the principle of Minimum Description Length (MDL), is proposed and implemented as part of the MFE3/GA system. Since the
2006 IEEE International Conference on Control Applications, 2006
Page 1. Diesel Engine Identification and Predictive Control using Wiener and Hammerstein Models E... more Page 1. Diesel Engine Identification and Predictive Control using Wiener and Hammerstein Models E. Pérez, X. Blasco, S. Garcıa-Nieto, J. Sanchis Abstract Air management process in a turbocharged Diesel engine is a multivariable ...
Lecture Notes in Computer Science, 2001
2007 IEEE International Symposium on Intelligent Signal Processing, 2007
This work presents a new method for object recognition in complex scenes combining vision-based t... more This work presents a new method for object recognition in complex scenes combining vision-based techniques applied to the 3D data obtained using range sensors, and object identification coming from Radio Frequency tags (RFID technology). Vision based algorithms for 3D recognition have many restrictions in practical applications: uncertainty, incapability for real time tasks; but they work well for pose determination once
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2009
When used for data reduction, feature selection may successfully identify and discard irrelevant ... more When used for data reduction, feature selection may successfully identify and discard irrelevant attributes, and yet fail to improve learning accuracy because regularities in the concept are still opaque to the learner. In that case, it is necessary to highlight regularities by constructing new characteristics that abstract the relations among attributes. This paper highlights the importance of feature construction when
Macrobrachium acanthurus inhabits estuaries and rivers in the western Atlantic. It is not clear w... more Macrobrachium acanthurus inhabits estuaries and rivers in the western Atlantic. It is not clear whether females migrate towards estuaries to hatch larvae, as reported for other congeneric shrimps. We tested whether females of M. acanthurus exhibit reproductive migrations. The population dynamics of this shrimp was studied in the Ribeira de Iguape River, Brazil. Four sites that differ in position with respect to the coast were sampled monthly during 2007. In M. acanthurus, reproduction was seasonal and reproductive intensity did not vary among study sites. Females brooding early and late embryos were found at all study sites during the reproductive season. No disappearance of reproductive females was observed at the study site located furthest away (,150 km) from the coast. Thus, reproductive females of M. acanthurus do not exhibit reproductive migrations towards estuaries to hatch larvae. Maturity in females was reached at smaller body sizes during the austral summer and spring compared with winter and autumn. Growth rate and body size was sex-specific; males grew slower but attained larger average and final body sizes than females. This information needs to be considered in assessing stocks and establishing sustainable management plans for M. acanthurus in Brazil.
Icml, 1996
... INPROCEEDINGS{Perez96learningdespite, author = {Eduardo Perez and Larry ... 1 MOTIVATION Beca... more ... INPROCEEDINGS{Perez96learningdespite, author = {Eduardo Perez and Larry ... 1 MOTIVATION Because there is no hope of finding a universal learner (Watanabe, 1985; Schaffer, 1994; Rao, Gordon, & Spears, 1995), it is important to discover the conditions that favor a given ...
Medicina, 2005
HIV patient hospitalization during the pre and post-HAART era. The purpose of this study was to d... more HIV patient hospitalization during the pre and post-HAART era. The purpose of this study was to describe and to compare the characteristics of patient admissions during two periods, one pre HAART and the other when HAART was fully available. A retrospective analysis of demographic data, ambulatory care informa- tion and hospitalization characteristics was performed. Causes of admission, outcome, mortality, length
Med Clin, 2007
No existen estudios epidemiológicos sobre la incidencia de miopatía inflamatoria en España. El ob... more No existen estudios epidemiológicos sobre la incidencia de miopatía inflamatoria en España. El objetivo de este estudio fue determinar las tasas de incidencia de dermatomiositis y polimiositis y su distribución en el territorio español.Estudio descriptivo observacional a partir de los datos del Conjunto Mínimo Básico de Datos de Altas Hospitalarias en el período 1997-2004. Se analizaron las variables sexo, comunidad autónoma y edad. Se calcularon las tasas de incidencia de hospitalización en casos por millón de habitantes y año brutas y estandarizadas y su intervalo de confianza (IC) del 95%, en total y por comunidad autónoma. Para el análisis de tendencia del período estudiado, se calculó la odds ratio (OR) de tendencia mediante regresión logística.La tasa de incidencia total del conjunto de dermatomiositis y polimiositis fue de 8,9 (IC del 95%, 8,6-9,2) nuevos casos por millón de habitantes y año; la de polimiositis, 3,9 (IC del 95%, 3,7-4,1), y la dermatomiositis, 4,9 (IC del 95%, 4,7-5,2). La diferencia entre las tasas de ambas enfermedades fue estadísticamente significativa (p < 0,001). La tasa de incidencia anual de ambas enfermedades disminuyó de forma significativa durante el período (dermatomiositis, OR de tendencia = 0,95; IC del 95%, 0,93-0,97; p < 0,001; polimiositis, OR = 0,96; IC del 95%, 0,93-0,97; p < 0,001). La incidencia de ambas enfermedades fue significativamente superior en mujeres. Las tasas de incidencia de polimiositis oscilaban en las diferentes comunidades autónomas entre 2,2 y 10,6 casos por millón de habitantes y año y las de la dermatomiositis, entre 2,9 y 8,6 casos por habitantes y año.La incidencia de dermatomiositis y polimiositis en España es similar a la observada en otras zonas del mundo. La disminución de la incidencia mantenida a lo largo del período y la incidencia más alta de dermatomiositis podrían explicarse por una mejor categorización de estas enfermedades.Epidemiologic studies of polymyositis-dermatomyositis incidence in Spain are lacking. The aim of the study was to determine the incidence rates of dermatomyositis-polymyositis and their distribution in our country.Observational and descriptive study. Data was obtained from hospital discharge code (CMBD) during the period 1997-2004. Sex, region and age were analysed. Raw and standardized incidence rates for each region studied were calculated as new cases/million population/year with 95% confidence interval (CI). Trend odds ratio (OR) was calculated by means of a logistic regression.Global incidence rate in polymyositis-dermatomyositis was 8.9 new cases/million population/ year (CI 95%, 8.6-9.2); 3.9 (CI 95%, 3.7-4.1) for polymyositis and 4.9 (CI 95%, 4.7-5.2) for dermatomyositis. Rate differences between both diseases reached statistical significance (p < 0.001). Annual incidence rate decreased significantly across the period studied in both diseases with a trend OR of 0.95 (CI 95%, 0.93-0.97; p < 0.001) in dermatomyositis and 0.96 (CI 95%, 0.93-0.97; p < 0.001) in polymyositis. Both diseases were significantly more frequent in females (p < 0.001). The incidence rates for each region varies between 2.2 and 10.6 cases/million population/year in polymyositis and between 2.9 and 8.6 cases/million population/ year in dermatomyositis.Incidence of dermatomyositis-polymyositis in Spain is similar to other countries. Decreased incidence observed across the period and the higher incidence of dermatomyositis could be explained because of a better diagnosis of these entities.
Acta Crystallographica Section C Crystal Structure Communications
The anionic complex in the title compound, (C(16)H(36)N)(2)[Pd(2)(C(12)H(12)O(8))(2)Cl(2)], lies ... more The anionic complex in the title compound, (C(16)H(36)N)(2)[Pd(2)(C(12)H(12)O(8))(2)Cl(2)], lies on a centre of inversion, so that the [Pd(2)(mu-Cl)(2)] core is planar, which is the most frequent conformation found for complexes containing this moiety in the Cambridge Structural Database [October 2001 Release; Allen & Kennard (1993). Chem. Des. Autom. News, 8, 1, 31-37]. This dinuclear complex has a Pd...Pd distance of 3.5119 (4) A. The bite angle of the chelating ligand [79.79 (8) degrees] distorts the square-planar coordination around the metal atom.
International Journal of Nursing, 2015
The aims of this article are: 1) to examine the associations between health provider-diagnosed de... more The aims of this article are: 1) to examine the associations between health provider-diagnosed depression and multimorbidity, the condition of suffering from more than two chronic illnesses; 2) to assess the unique contribution of chronic illness in the prediction of depression; and 3) to suggest practice changes that would address risk of depression among individuals with chronic illnesses. Data collected in a cross-sectional community health study among adult Mexicans (n= 274) living in a low income neighborhood (colonia) in Ciudad Juárez, Chihuahua, Mexico, were examined. We tested the hypotheses that individuals who reported suffering chronic illnesses would also report higher rates of depression than healthy individuals; and having that two or more chronic illnesses further increased the risk of depression.
Un enfoque bioeconómico precautorio
Interciencia
Para el camarón blanco Litopenaeus schmitti se han reportado diferentes parámetros de crecimiento... more Para el camarón blanco Litopenaeus schmitti se han reportado diferentes parámetros de crecimiento en el occidente de Venezuela. Tales diferencias han sido atribuidas tanto a los distintos métodos como a las distintas bases de datos empleadas en la estimación. Para evaluar esta explicación se reanalizaron los parámetros de crecimiento para la especie, utilizando dos bases de datos y dos métodos de ajuste: ELEFAN y una minimización de cuadrados. La primera base de datos consistió de frecuencias de longitudes de juveniles capturados en el Lago de Maracaibo en el periodo 1991-1993. La segunda consistió de frecuencias de longitudes de juveniles y adultos capturados en el Golfo de Venezuela y el Lago de Maracaibo durante el periodo 2001-2003. Para ajustar los parámetros mediante ELEFAN se empleó el software FiSAT, en tanto que para el método de mínimos cuadrados se usaron planillas de cálculo. Los resultados mostraron que los tamaños registrados en las bases de datos tienen un mayor impac...
2008 IEEE International Conference on Acoustics, Speech and Signal Processing, 2008
We present an Active Noise Control (ANC) system that is designed to cancel acoustic noise at high... more We present an Active Noise Control (ANC) system that is designed to cancel acoustic noise at high sound levels. The ANC system is graphically designed using Lab VIEW and implemented on FPGA. NLMS algorithm is used for updating the filter co-efficients. The ANC system is evaluated on a realistic test-bed mimicking an actual fMRI bore. The algorithm is tested for various tonal frequencies in the range from 100 to 5000 Hz and the performance is measured in terms of the noise cancellation. We observe that good noise cancellation (15 to 45 dB SPL) can be obtained with NLMS algorithm over the entire bandwidth.
HIV patient hospitalization during the pre and post-HAART era. The purpose of this study was to d... more HIV patient hospitalization during the pre and post-HAART era. The purpose of this study was to describe and to compare the characteristics of patient admissions during two periods, one pre HAART and the other when HAART was fully available. A retrospective analysis of demographic data, ambulatory care informa- tion and hospitalization characteristics was performed. Causes of admission, outcome, mortality, length
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2005
We describe the design and performance of a hybrid extensive air shower detector array built on t... more We describe the design and performance of a hybrid extensive air shower detector array built on the Campus of the University of Puebla (19 N, 90 W, 800 g=cm 2 ) to measure the energy, arrival direction and composition of primary cosmic rays with energies around 1 PeV, i.e., around the knee of the cosmic ray spectrum. The array consists of 3 water Cherenkov detectors of 1:86 m 2 cross-section and 12 liquid scintillator detectors of 1 m 2 distributed in a square grid with a detector spacing of 20 m over an area of 4000 m 2 . We discuss the calibration and stability of the array for both sets of detectors and report on preliminary measurements and reconstruction of the lateral distributions for the electromagnetic (EM) and muonic components of extensive air showers. We also discuss how the hybrid character of the array can be used to measure mass composition of the primary cosmic rays by estimating the relative contents of muons with respect to the EM component of extensive air showers. This facility is also used to train students interested in the field of cosmic rays. r
Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2002
The humidity correction factors specified by IEC Publication 60-1 (1989) and IEEE Std.-4 (1995) f... more The humidity correction factors specified by IEC Publication 60-1 (1989) and IEEE Std.-4 (1995) for impulse voltages are restricted to 1≤h/δ&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt;15. However, values of h/δ≥15 g/m3 in many regions of the world are present. The IEC-60 and the IEEE Std.-4 procedures are based on the macroscopic observation that the atmospheric correction factors are larger when the discharge is governed mainly
Lecture Notes in Computer Science, 2007
When primitive data representation yields attribute inter- actions, learning requires feature con... more When primitive data representation yields attribute inter- actions, learning requires feature construction. MFE2/GA, a GA-based feature construction has been shown to learn more accurately than oth- ers when there exist several complex attribute interactions. A new flt- ness function, based on the principle of Minimum Description Length (MDL), is proposed and implemented as part of the MFE3/GA system. Since the
2006 IEEE International Conference on Control Applications, 2006
Page 1. Diesel Engine Identification and Predictive Control using Wiener and Hammerstein Models E... more Page 1. Diesel Engine Identification and Predictive Control using Wiener and Hammerstein Models E. Pérez, X. Blasco, S. Garcıa-Nieto, J. Sanchis Abstract Air management process in a turbocharged Diesel engine is a multivariable ...
Lecture Notes in Computer Science, 2001
2007 IEEE International Symposium on Intelligent Signal Processing, 2007
This work presents a new method for object recognition in complex scenes combining vision-based t... more This work presents a new method for object recognition in complex scenes combining vision-based techniques applied to the 3D data obtained using range sensors, and object identification coming from Radio Frequency tags (RFID technology). Vision based algorithms for 3D recognition have many restrictions in practical applications: uncertainty, incapability for real time tasks; but they work well for pose determination once
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2009
When used for data reduction, feature selection may successfully identify and discard irrelevant ... more When used for data reduction, feature selection may successfully identify and discard irrelevant attributes, and yet fail to improve learning accuracy because regularities in the concept are still opaque to the learner. In that case, it is necessary to highlight regularities by constructing new characteristics that abstract the relations among attributes. This paper highlights the importance of feature construction when
Macrobrachium acanthurus inhabits estuaries and rivers in the western Atlantic. It is not clear w... more Macrobrachium acanthurus inhabits estuaries and rivers in the western Atlantic. It is not clear whether females migrate towards estuaries to hatch larvae, as reported for other congeneric shrimps. We tested whether females of M. acanthurus exhibit reproductive migrations. The population dynamics of this shrimp was studied in the Ribeira de Iguape River, Brazil. Four sites that differ in position with respect to the coast were sampled monthly during 2007. In M. acanthurus, reproduction was seasonal and reproductive intensity did not vary among study sites. Females brooding early and late embryos were found at all study sites during the reproductive season. No disappearance of reproductive females was observed at the study site located furthest away (,150 km) from the coast. Thus, reproductive females of M. acanthurus do not exhibit reproductive migrations towards estuaries to hatch larvae. Maturity in females was reached at smaller body sizes during the austral summer and spring compared with winter and autumn. Growth rate and body size was sex-specific; males grew slower but attained larger average and final body sizes than females. This information needs to be considered in assessing stocks and establishing sustainable management plans for M. acanthurus in Brazil.