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1.
Rev. peru. biol. (Impr.) ; 26(3)ago. 2019.
Article in Spanish | LILACS-Express | LILACS | ID: biblio-1508850

ABSTRACT

El objetivo de este trabajo fue evaluar el cuerpo de agua y los sedimentos de una charca estacional, además de describir el ciclo de vida y proporciones de sexo de Dendrocephalus affinis en condiciones de laboratorio. La charca se muestreó desde 2010 hasta 2012, la cual se caracterizó la fisicoquímica del agua y la granulometría y metales pesados del sedimento. Simultáneamente se tomaron muestras de sedimento para recolectar los quistes usados para la descripción del ciclo de vida, la supervivencia y proporción de sexo de D. affinis en laboratorio. La charca mostró condiciones mesotróficas en época de lluvia y mayor carga orgánica en época seca. El suelo dominante fue lodoso, lo cual facilitó la retención de agua. Los metales pesados mostraron concentraciones dentro del rango habitual en estos ambientes. Los macroinvertebrados asociados estuvieron conformados por representantes de siete órdenes y 28 géneros, de los cuales los órdenes Hemiptera y Coleoptera fueron los más abundantes con el 39.7 y 31.8 % respectivamente. El ensayo de laboratorio mostró que los nauplios de D. affinis vivieron 30 días, y tuvieron una supervivencia del 31.6 %. Este trabajo también contribuyó con una descripción una charca estacional del ciclo de vida de D. affinis en condiciones de laboratorio. Dendrocephalus affinis mostró ser un organismo con corto ciclo de vida, de crecimiento rápido y alta tasa de supervivencia, lo cual favorece su uso como potencial alimento vivo en la acuicultura.


The aim of this work was to evaluate the water system and the sediments of a temporary pond, in addition to describe the life cycle and asses sex proportions of D. affinis in laboratory conditions. The pond was sampled during the years 2010 - 2012, the physicochemical of the water, granulometry and heavy metals of the sediment were also evaluated. Simultaneously, we took samples of the sediment to collect the cysts that were used to describe the life cycle, survival and sex proportions at laboratory. During the rainy season, the pond showed mesotrophic conditions and in the dry season high organic load. The muddy soil was dominant and allowed the water retention. The heavy metals values were found in the normal ranges of similar systems. The macroinvertebrates associated to the pond were formed by seven orders and 28 genera, which Hemiptera and Coleoptera orders were the most abundant with 39.7 and 31.8 % respectively. Laboratory essays showed that nauplus of D. affinis lived 30 days and had a survival of 31.6%. This work also contributed with a description of a temporary pond and of the life cycle of D. affinis in laboratory conditions. Dendrocephalus affinis showed be organisms with short life cycle, fast grown and high survival ratio, this favor its use as live food potential in the aquaculture.

2.
Ciênc. agrotec., (Impr.) ; 32(2): 598-603, mar.-abr. 2008. ilus, tab
Article in Portuguese | LILACS | ID: lil-483368

ABSTRACT

Objetivou-se, neste trabalho desenvolver uma metodologia para produção de biomassa de "branchoneta" Dendrocephalus brasiliensis Pesta, 1921. Os experimentos foram realizados na Estação de Piscicultura da CHESF, Paulo Afonso-BA, com a finalidade de viabilizar a branchoneta como fonte alternativa de alimento na aqüicultura. A metodologia constou de dois tratamentos (com e sem inoculação de cistos de D. brasiliensis) realizada em duas épocas distintas (maio e outubro), com duas repetições. Foram utilizados quatro viveiros semi-escavados. Após a ANOVA (P<0,05) constatou-se que o tratamento com inoculação apresentou uma produção média de 18,63 ± 0,74 kg superior a 8,00 ± 0,75 kg do outro tratamento, podendo-se assim produzir uma biomassa de 1.863 kg/ha/ano. Os resultados obtidos recomendam produção de biomassa de D. brasiliensis utilizando a metodologia de inoculação de cistos.


This work aimed to develop a methodology for the production of biomass of "branchoneta" Dendrocephalus brasiliensis Pesta, 1921. The experiments were accomplished at Paulo Afonso Fishculture Station of CHESF, BA, with the purpose of making possible the branchoneta as an alternative source of food in the aquaculture. The methodology consisted of two treatments (with and without inoculation of D. brasiliensis cysts) carried out at two different times (May and October), with two repetitions to each treatment. Four semi-excavated ponds, each with an area of 2000 m², were used. After ANOVA (P < 0,05) it was verified that treatment with inoculation showed the best results: 18,63 ± 0,74 kg superior to 8,00 ± 0,75 kg of the other treatment. This suggests an average biomass production of 1.863 kg/ha/year. The results obtained recommend production of biomass of D. brasiliensis using the methodology of inoculation of cysts.

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