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Lethal concentration of Cymbopogon citratus (Poaceae) essential oil for Dolops discoidalis and Argulus sp. (Crustacea: Argulidae)
Author(s) -
Pereira Elcimara Cardoso,
Oliveira Elzamara Castro,
Sousa Elen Monique Oliveira,
Silva Hugo Napoleão Pereira,
Corrêa Lincoln Lima,
Mourão Rosa Helena Veras,
TavaresDias Marcos,
Silva Lenise Vargas Flores
Publication year - 2020
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/jfd.13250
Subject(s) - cymbopogon citratus , biology , essential oil , acute toxicity , toxicity , veterinary medicine , botany , toxicology , medicine
This study investigated the acute toxicity (LC 50‐24 hr ) effects of the essential oil of Cymbopogon citratus for adult Argulus sp. and Dolops discoidalis , before and during oviposition. In vitro acute toxicity (LC 50‐24 hr ) was tested using 20, 40, 60, 80, 100, 120, 140 and 160 μg/L of C. citratus essential oil, and two control groups (one with cultivation tank water and one with cultivation tank water + alcohol) were used. Specimens of Argulus sp. and D. discoidalis submitted to acute toxicity were evaluated using histological procedures. The major chemical compounds of C. citratus essential oil were geranial (47.5%), neral (35.6%) and myrcene (6.7%). The LC 50‐24 hr for Argulus sp. adults was 67.97 μg/L, while for D. discoidalis it was 59.55 µg/L. In the oviposition of both species of argulids, maximum mortality began with treatments of 140 μg/L, while the LC 50‐24 hr for Argulus sp. and D. discoidalis was 83.98 μg/L and 82.48 μg/L, respectively. In both argulid species exposed to C. citratus essential oil, morphological alterations were observed only in the eyes, and they occurred in the ommatidium and rhabdomeres and were dependent on the concentration of C. citratus essential oil and the parasite species.