Nancy Brito Manzano

Nancy Brito Manzano
Universidad Juárez Autónoma de Tabasco | UJAT · Programa en Ingeniería en Acuacultura

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37
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Publications

Publications (37)
Article
El objetivo de este estudio fue evaluar el contenido de metales (Cr, Cd y Pb) en el ostión Crassostrea virginica, en la laguna Machona, Tabasco, México. Muestras de agua, sedimento y ostiones fueron colectadas durante el 2021. Se realizó la determinación de los metales pesados cadmio, cromo y plomo en agua, sedimento y ostión por Espectrofotometría...
Article
constituyen un peligro para la biota acuática y el ser humano y un factor de deterioro de la calidad hídrica y ambiental. Los sedimentos ribereños, uno de los principales reservorios de estos elementos, actúan como fuentes secundarias de contaminación de los cuerpos de agua, por lo que resulta importante evaluar la concentración de metales como una...
Article
Se realizó una caracterización poblacional del ostión americano Crassostrea virginica existente en tres lagunas costeras de Tabasco. Para esto se determinó la biometría, la estructura poblacional, los parámetros de crecimiento poblacional y el rendimiento durante un ciclo anual. Mensualmente se recolectaron al azar 200 organismos determinándose: fr...
Article
Se investigaron los niveles de concentración de Cadmio (Cd) y Plomo (Pb) en el ostión Crassostrea virginica, que representa uno de los recursos más importantes en la pesquería tradicional del estado de Tabasco y en los sedimentos adyacentes a los bancos ostrícolas muestreados. 50 ostiones fueron colectados por buceo autónomo y los sedimentos fueron...
Article
Full-text available
El objetivo de la presente investigación fue determinar el contenido de metales pesados en el ostión Crassostrea virginica proveniente de la Laguna Machona, Tabasco, analizadas por cuadriplicado por Espectrofotometría de Absorción Atómica. Debido a que la laguna Machona se localiza en un área donde se encuentran factores que provocan contaminación:...
Article
En el presente trabajo se empleó al ostión Crassostrea virginica, el cual es de gran importancia tanto para el comercio como para el consumo de las comunidades asentadas a lo largo del Golfo de México. El deterioro de las pesquerías del ostión, debidas principalmente a la contaminación ambiental, antropogénica y a la presencia de diversos metales p...
Article
Foi realizado um experimento com 100 cordeiros dos cruzamentos Katahdin, Pelibuey, Dorper e Blackbelly, distribuídos em cinco tratamentos: T1) Pastoreio, T2) T1 + Ração comercial (AC), T3) T1 + Dieta 1, T4) T1 + Dieta 2, T5) T1 + Dieta 3. No primeiro mês, AC, D3 e D1 registraram as maiores ingestões (P 0,05), em comparação ao tratamento D2. Durante...
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The effectiveness of two stimuli (thermal and salinity shock) in inducing spawning in the eastern oyster Crassostrea virginica was tested under laboratory conditions. Organisms were obtained in Machona Lagoon, located in Sánchez Magallanes, Tabasco. Temperatures used were 10, 15, 20, 25 and 30 °C and the salinities were 10, 15, 20, 25 and 30 psu. T...
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The effect of the addition of an organic mineral (Bioplex Quality Meat) and a complement of African oil palm fiber as supplementary forage in the gain and digestibility of fattening steers in grazing under tropical conditions was studied. A total of 40 crossbreed steers (Bos taurus x Bos indicus), with average initial live weight of 276 ± 28 kg for...
Article
The effect of the addition of an organic mineral (Bioplex Quality Meat) and a complement of African oil palm fiber as supplementary forage in the gain and digestibility of fattening steers in grazing under tropical conditions was studied. A total of 40 crossbreed steers (Bos taurus x Bos indicus), with average initial live weight of 276 ± 28 kg for...
Article
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The queen conch, Strombus (Lobatus) gigas, is one of six species of conch distributed throughout the Caribbean of significant commercial importance. The Caribbean region is adversely impacted by climate change, which affects the marine ecosystems and the calcification process of organisms with calcareous structures, such as mollusks. We tested the...
Article
Full-text available
The effect of the addition of an organic mineral (Bioplex Quality Meat) and a complement of African oil palm fiber as supplementary forage in the gain and digestibility of fattening steers in grazing under tropical conditions was studied. A total of 40 crossbreed steers (Bos taurus x Bos indicus), with average initial live weight of 276 ± 28 kg for...
Chapter
Full-text available
El cambio climático es resultado de las emisiones de gases de efecto invernadero (CO2, CH4, y NO2, principalmente) a la atmósfera. El problema radica en que los volúmenes de estos gases, emitidos durante los últimos 150 años de industrialización, superan la capacidad de captura de la biósfera y el resultado neto es el aumento constante de las conce...
Article
Full-text available
The objective of this research was to evaluate the diversity of maize landraces, which are cultivated in Grijalva region of the state of Tabasco, Mexico. The evaluation was conducted during the year 2011. Thirty eight maize landraces from nine municipalities of the Grijalva region were evaluated. Eighteen morphological traits were recorded to asses...
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The combined influence of feeding schedule and photoperiod on fighting conch, Strombus pugilis (Linné, 1758) larvae growth and survival was studied using two feeding schedules (12 h and 24 h with food) and three photoperiods (0 h light, 12 h light and 24 h light). This effect of feeding and photoperiods was tested in three months (May, June and Jul...
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La estimación de parámetros genéticos en experimentos de cruzas dialélicas ayuda en la toma de decisiones objetivas en los programas de mejoramiento genético. Los objetivos de la presente investigación fueron estimar la heterosis, la aptitud combinatoria general (ACG) de ocho poblaciones de maíz (Zea mays L.) y la aptitud combinatoria específica (A...
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The objective of this study was to determine the effect of the population density on the grain yield of nine tropical maize genotypes (Zea mays L.). A study was conducted in 2005 at the experimental station of the Universidad Juárez Autónoma de Tabasco, Centro municipality, Tabasco. A randomized complete block experimental design with four replicat...
Article
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The in vitro digestibility of dry matter (DIVMS) of complete diets with manure silage (0, 50, 75 and 100%) was analysed in order to replace corn stover with two forrage:concentrate ratios (70:30 vs 80:20). Silage was prepared with 50 % cattle manure, 20 % cane molasses–water (1:1.5) and 30 % corn stover. The DIVMS values for the 70:30 ratio were 61...
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Con el fin de describir el desarrollo ontogenético de las larvas de Strombus gigas se recolectaron masas de huevos del medio natural y se cultivaron bajo condiciones de laboratorio durante mayo, junio y julio, correspondientes al máximo de la época reproductiva en el arrecife Alacranes, durante 1997, 1998, 1999 y 2000. La misma técnica de cultivo e...
Article
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The objective of this study was to estimate the general combining ability (GCA) in eight inbred lines of quality protein maize (Zea mays L.) and the specific combining ability (SCA) in their direct crosses. The genetic material consisted of 28 crosses derived from crossing eight inbred lines. The crosses were evaluated at Torreón, Coauhila, México;...
Article
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The development, growth and survival of Strombus gigas (Linné, 1758) larvae were studied over a period of 30 days in laboratory culture. The fertilized egg masses used for the larval culture experiment were collected in Alacran's Reef from March to September. Experiments were conducted at 29±1 °C. Veligers were reared at 200 larvae l−1 in 4-l conta...
Article
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Stages from oviposition to veliger hatching are described for Strombus pugilis under laboratory conditions. Two egg masses from Playa Seyba, México, (20 degrees 45' N, 91 degrees 45' W) were used (three sub-samples per mass). Each sub-sample was immersed in a 11 container at 29 +/- 1 degrees C. This description is based on stages known from Strombu...
Article
Stages from oviposition to veliger hatching are described for Strombus pugilis under laboratory conditions. Two egg masses from Playa Seyba, México, (20°45′ N, 91°45′ W) were used (three sub-samples per mass). Each sub-sample was immersed in a 11 container at 29 ± 1°C. This description is based on stages known from Strombus gigas, which include num...
Article
Full-text available
Fighting conch, Strombus pugilis, larvae were reared from hatching to settlement under two feeding schedules: larvae were fed during 12 light hours (06:00-18:00, Set A) and larvae were fed during 12 dark hours (18:00-06:00, Set B). The study evaluated the effect of food availability during the day or night on larvae development, growth and survival...
Article
Full-text available
The development, growth and survival of Strombus pugilis (Linné, 1758) larvae were studied over a period of 31 d in laboratory culture. Experiments were conducted at 29° ± 1°C. Veligers were reared at 200 larvae L−1 in 4-L containers. Larvae were fed with the algae Tetraselmis suecica at 1000 cells L−1. S. pugilis larvae have 1.5 whorls at hatching...
Article
The development of Strombus pugilis larvae was studied over a period of 31 days in laboratory culture. Experiments were conducted at 29 degrees C+/-1 degrees C Veligers were reared at 200 larvae.l(-1) in 4 liter containers. Larvae were fed with the microalgae Tetraselmis suecica at 1000 cells.l(-1). Nineteen development characteristics are describe...
Article
Strombus gigas samples were collected in Banco Chinchorro, Quintana Roo, Mexico (18°47'-18°23' N; 87°14' W). Shell body and spire lenght were measured. Fat content of gonad, digestive gland and meat of male and female conchs, was analyzed by the standard and microsoxhlet methods on a monthly basis for a year. Mean lenght for shell, body and spire w...
Article
Strombus gigas samples were collected in Banco Chinchorro, Quintana Roo, Mexico (18 degrees 47'-18 degrees 23' N; 87 degrees 14' W. Shell, body and spire lenght were measured. Fat content of gonad, digestive gland and meat of male and female conchs, was analyzed by the standard and microsoxhlet methods on a monthly basis for a year. Mean lenght for...
Article
Full-text available
Fighting conch, Strombus pugilis, larvae were reared from hatching to settlement under three photoperiods, with light phases of 0 light (0 L), 12 light (12 L) and 24 light (24 L) per day to test their effect on development, growth and survival. Proboscis appeared at 21 days in different percentages for three photoperiods: 30% for larvae under 0 L,...