Banca de DEFESA: ELCIMARA CARDOSO PEREIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : ELCIMARA CARDOSO PEREIRA
DATA : 27/02/2019
HORA: 14:30
LOCAL: sala3 ICTA
TÍTULO:

EFFECT OF LEMON GRASS ESSENTIAL OIL (Cymbopogon citratus) IN ARGULIDES (Crustacea, Branchiura): Argulus sp and Dolops discoidalis

PALAVRAS-CHAVES:

natural products, fish lice, toxicity

PÁGINAS: 53
GRANDE ÁREA: Ciências Biológicas
ÁREA: Ecologia
SUBÁREA: Ecologia Aplicada
RESUMO:

The increase in the number of fish farms in the national territory associated to the intensification of production, there have been outbreaks and high fish mortalities due to the diseases. One of the main obstacles is the occurrence of parasitic infestations, followed or not by the presence of opportunistic pathogens. Among these opportunistic pathogens are crustaceans, periodic ectoparasites of marine and sweet fish. Among the crustaceans, there is the subclass Branchiura, popularly called "fish lice" or Argulídeos, which compromises sanity in aquaculture, so its control is fundamental. However, the use of natural products (phytotherapics) has been gaining prominence in animal health, mainly because they are efficient bioactive substances in parasitic control. One of these plants with potential use in aquaculture is the holy grass (Cymbopogon citratus), the essential oil extracted from this plant is efficient in the control of bovine ectoparasites. This thesis studied the effects of the essential oil of C. citratus in the control of ectoparasites of fish belonging to the family Argulidae (Dolops discoidalis and Argulus sp), through the LC50-24h test with dosages 20 μg/L, 40 μg/L; 60 μg/L, 80 μg/L, 100 μg/L, 120 μg/L, 140 μg/L and 160 μg/L. The maximum mortality for the representatives of Argulus sp started from the concentration of 100 μg/L, while the maximum mortality of Dolops discoidalis started in the treatment of 80 μg/L. The Lethal Concentration (LC50-24h) for adult Argulus sp was 76,3μg / L and adult Dolops discoidalis was 59,3μg / L. It was observed that all mortality in the test (LC50-24h) occurred in the first hour. The essential oil of C. citratus was also tested (LC50-24h) in the ovipositions of argulids, in both the maximum mortality (100%) of the ovipositions started from the treatments of 140μg / L and 160μg / L. The Lethal Concentration (LC50-24h) for the ovipositions of Argulus sp and Dolops discoidalis were 99,7 μg / L and 99,3 μg / L, respectively. The parasite phase was important for the definition of the control concentration. In addition, studies are required to evaluate the effect on infected fish for the indication of this oil in aquaculture, since in this work, low concentrations of C. citratus O.E. CL were determined in the control of adult Argulids.

MEMBROS DA BANCA:
Presidente - 2587316 - LENISE VARGAS FLORES DA SILVA
Interno - 1836832 - RUY BESSA LOPES
Externo ao Programa - 2383549 - GUSTAVO DA SILVA CLAUDIANO
Externo ao Programa - 011.678.013-42 - VALÉRIA MOURÃO DE MOURA - UEA