Safety and Effectiveness of Trichlorfon in Prevention of Lernaeosis and Its Comparison with Plant Extracts in Lernaeosis Control

Year 2018, , 32 - 38, 21.02.2018

Manal A. A. Essa Fatma M.m. Korni

https://doi.org/10.18864/ASE201806

Abstract

This study was carried
out to evaluate the safety and effectiveness of trichlorfon in prevention of
lernaeosis among hatchery-reared cyprinids. Also, it compared with plant
extracts (carvacrol and cymene mixture and thyme) in lernaeosis control. At the
Abo-Saleh fish hatchery in BeniSuef, Egypt, the trichlorfon bioconcentrations
of cyprinids fries and fingerlings, as well as soil, water and plant samples
were examined for 2 years. Trichlorfon was detected in fingerlings, water and
plant samples, except soil sampled 1 hr after trichlorfon was applied to the
fish pond. The highest concentration of trichlorfon was in fish, followed by
water and plant samples. No trichlorfon was detected in fingerlings, water,
plant and soil sampled after 5 days and 5 months. Fingerlings and brooders of
cyprinids were examined in situ for clinical abnormalities and prevalence of
lernaeosis. In addition, the intensity of the lernaea infestation was
determined. Macroscopic Lernaea cyprinacea females were seen attached to the
skin and fins associated with swollen hyperemic nodules and open wounds.
Lernaeosis appeared sporadically during examination seasons with a high
intensity. Under experimental condition, trichlorfon succeeded in controlling
lernaeosis among Ctenophyrngedon idella fingerlings, as it eliminated 100% of
Lernaea cyprinacea in comparison with 74.28% and 50.2% in carvacrol and cymene
mixture and thyme treated fish respectively. 

Keywords

Trichlorfon, cyprinids, lernaeosis, carvacrol, cymene, thyme

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