973 resultados para Prawn Penaeus-japonicus


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Tesis (Maestría en Ciencias con Especialidad en Recursos Alimenticios y Producción Acuícola) UANL

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Tesis (Maestría en Ciencias con Especialidad en Parasitología) UANL

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Tesis (Maestría en Ciencias con Especialidad en Recursos Alimenticios y Producción Acuícola) UANL

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Tesis (Maestría en Ciencias Biológicas con especialidad en Ecología Acuática y Pesca) UANL

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Tesis (Maestría en Ciencias con Especialidad en Ecología Acuática y Pesca) U.A.N.L.

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Tesis (Maestría en Ciencias con Especialidad en Recursos Alimenticios y Producción Acuícola) U.A.N.L. Facultad de Ciencias Biológicas.

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Tesis (Maestría en Ciencias con Especialidad en Recursos Alimenticios y Producción Acuícola) U.A.N.L. Facultad de Ciencias Biológicas.

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Tesis (Maestría en Ciencias con Especialidad en Ecología Acuática y Pesca) U.A.N.L. Facultad de Ciencias Biológicas.

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The present study was undertaken to elucidate the nutritional and pathological changes associated with aflatoxin B1 toxicity in Penaeus monodon and to determine the efficacy of vitamins E and K, and Amrita Bindu, herbal mixture in ameliorating the toxicity of AFB1. The main objectives the study is to document the pathological and immunological changes in P.monodon fed with AFB1 incorporated diets and to delineate the histological and ultrastructural changes and determine the presence of AFB1 residue in the shrimp body, to evaluate the growth performance of feed efficiency in P. monodon post larvae fed AFB1 added diets, to assess the interactive effect of heavy metals like copper and cadmium at sub-lethal levels in P. monodon postlarve fed AFB1 added diets, to decipher the ameliorative action of Vitamins E & K and a spicy herbal mixture, Amrita Bindu on AFB1 in P.monodon sub-adults. The study has revealed that Aflatoxin B1 significantly affects protein, lipid and carbohydrate metabolism in the shrimp penaeus monodon. The remarkable effect was observed in the immune system, as AFB1 has elevatod the immune response during initial days of exposure and prolonged exposure to the toxin leads to weakening of the animal’s immunity. Aflatoxin B1 level above 50 ppb severely affected the growth and feed utilization which in turn reflects the damage caused to the hepatopancreas as evident from the histological and ultrastructural observations.

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Heterotrophic bacterial flora of Pmonadon from an apparently healthy hatchery system as well as a pool with heavy mortality were isolated and studied. In the healthy systems comparatively higher generic diversity with Pseudomonas, Acinetobacter, Bacillus, Micrococcus, members of the family Enterobacteriaceae and coryneform group in the diminishing order of dominance was recorded. Meanwhile from the moribund larvae and rearing water Aeromonas and Pseudomonas could be isolated in almost equal proportions. Strikingly, Aeromonas could not be isolated from the apparently healthy larval rearing system and its exclusive occurrence in the sick culture system in comparatively higher percentage suggested its possible role in the mortality. They were found to be highly halophilic exhibiting growth at 10% NaCl. On testing their sensitivity to twenty antibiotics, four of them (Streptomycin, Gentamycin, Methamine mandelate and Cloramphenicol) were found to be effective on all the isolates of Aeromonas and Pseudomonas suggesting their possible application in the hatchery system in times of emergency. While doing so, Streptomycin would do comparatively better than the others as the minimum inhibitory dose required was comparatively lower (200ppm) within a period of 24 hours