Effects of different dietary of protein and lipid levels on the growth of freshwater prawns (Macrobrachium carcinus) broodstock

ABSTRACT Objective. Evaluate the effects of varying dietary protein and lipid levels on the growth and body composition of adult freshwater prawns, Macrobrachium carcinus (Linnaeus 1758), in a recirculation system for 11 weeks (77 days). Materials and methods. The experimental treatments were assigned in triplicate. Six test diets were formulated with three different protein levels (35, 40 and 45%) and two lipid levels (8 and 13%). Results. The highest survival rate, growth indices and feed utilization were observed for M. carcinus adults fed protein:lipid diets of 35:13, 40:13 and 45:13, and the lowest values for these parameters were recorded for prawns fed diets with the lowest lipid levels; the differences in these parameters between these types of diets were significant (p<0.05). A nonsignificant tendency for an increased percentage of protein in the body with an increased dietary protein level was observed. The percentage of lipids decreased with an increasing dietary protein level, and no definite trends in ash content were found. Conclusions. The results suggest that a diet with 35% dietary crude protein and 13% lipids enhances the growth and body composition of adult M. carcinus

Effects of different dietary of protein and lipid levels on the growth of freshwater prawns (Macrobrachium carcinus) broodstock

Objective. Evaluate the effects of varying dietary protein and lipid levels on the growth and body composition of adult freshwater prawns, Macrobrachium carcinus (Linnaeus 1758), in a recirculation system for 11 weeks (77 days). Materials and methods. The experimental treatments were assigned in triplicate. Six test diets were formulated with three different protein levels (35, 40 and 45%) and two lipid levels (8 and 13%). Results. The highest survival rate, growth indices and feed utilization were observed for M. carcinus adults fed protein:lipid diets of 35:13, 40:13 and 45:13, and the lowest values for these parameters were recorded for prawns fed diets with the lowest lipid levels; the differences in these parameters between these types of diets were significant (p<0.05). A non-significant tendency for an increased percentage of protein in the body with an increased dietary protein level was observed. The percentage of lipids decreased with an increasing dietary protein level, and no definite trends in ash content were found. Conclusions. The results suggest that a diet with 35% dietary crude protein and 13% lipids enhances the growth and body composition of adult M. carcinus

Aspectos básicos del cultivo del acocil Cambarellus montezumae en condiciones controladas

In Mexico, the cambarids are on the slope of the Gulf of Mexico, along the transverse neovolvanic axis. Some species in the center and north of the country, in Chiapas and the peninsula of Yucatan, their size is small and reaches a total length of 30 to 50mm. Since prehispanic times, the Mexicas and other indigenous groups installed around the basin of Mexico consumed abundantly the acocil, as part of their daily diet. At present, some indigenous groups in the center of the country are captured and consumed, as well as markets in the state of Morelos, and are quoted in international cuisine in Mexico City.En Mexico, los cambaridos se encuentran en la vertiente del golfo de Mexico, a lo largo del eje neovolvanico transversal. Algunas especies en el centro y norte del pais, en Chiapas y la peninsula de Yucatan, su tamañoi es pequeño y alcanza una longitud total de 30 a 50mm. Desde la epoca prehispanica, los mexicas y otros grupos indigenas instalados alrededor de la cuenca de Mexico consumian con abundancia el acocil, como parte de su dieta diaria. En la actualidad, algunos grupos indigenas en el centro del pais los capturan y consumen, asi como mercados del estado de Morelos y es cotizado en la cocina internacional en la ciudad de Mexico

Factores técnicos del manejo de la calidad agua y sedimento en policultivo camarón-tilapia en estanques

The polyculture of tilapia fish and shrimp is one of the mitigation techniques to reduce sanitary impact and effluents in shrimp farms. It mostly aims to increase production and control water quality of effluents. Some cases of success have reported the control of certain diseases and the improvement of soil quality in earthen ponds. This review analyzes the benefits obtained in terms of water quality, sediments, environment, production increase, and improvement of zootechnical parameters of shrimp polycultured with tilapia fish. Shrimp-tilapia polycultures can contribute with a positive effect to water quality and sediments from ponds and effluents of farms; this depends on density and environment conditions where polycultures are developed. However, they must be adapted, and their functionality and commercial profitability must be proven at small and large scales.El policultivo de camarón-tilapia es una de las estrategias de mitigación para los impactos sanitarios y los efluentes en las granjas camaroneras. Su finalidad principal es incrementar la producción y controlar la calidad del agua de sus efluentes. En casos de éxito se controlaron algunas enfermedades y mejoró la calidad del suelo en estanques de tierra. En esta revisión, se analizan los beneficios que se obtienen en la calidad del agua, sedimento, medio ambiente, incremento del rendimiento y el mejoramiento de los parámetros zootécnicos de camarones co-cultivados con tilapia. Los policultivos de camarón-tilapia pueden contribuir con un efecto positivo sobre la calidad del agua y sedimentos de los estanques y efluentes de las granjas de cultivo, lo cual depende de las condiciones de densidad y ambiente donde se desarrollan. Sin embargo, se requiere adaptar y demostrar su funcionalidad y rentabilidad comercial a pequeña escala e industrialmente

Mexico ants: incidence and abundance along the Nearctic–Neotropical interface

International audienceto explore different aspects of the population and community research of ants at different spatial scales, and to aid in the establishment of conservation policies and actions. There are no copyright restrictions. Please cite this data paper when using its data for publications or teaching events

Mexico's Ants: Who are They and Where do They Live?

International audienc