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Acute toxicity, behavioral changes, and histopathological effects of deltamethrin on tissues (gills, liver, brain, spleen, kidney, muscle, skin) of Nile tilapia ( Oreochromis niloticus L.) fingerlings
Author(s) -
Yildirim M. Zıynet,
Benlı A. Çağlan Karasu,
Selvı Mahmut,
Özkul Ayhan,
Erkoç Fıgen,
Koçak Oner
Publication year - 2006
Publication title -
environmental toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.813
H-Index - 77
eISSN - 1522-7278
pISSN - 1520-4081
DOI - 10.1002/tox.20225
Subject(s) - oreochromis , nile tilapia , gill , toxicity , deltamethrin , spleen , kidney , biology , acute toxicity , physiology , anatomy , toxicology , fish <actinopterygii> , fishery , medicine , endocrinology , ecology , pesticide , immunology
Deltamethrin, a synthetic pyrethroid contaminating aquatic ecosystems as a potential toxic pollutant, was investigated in the present study for acute toxicity. The purpose of this study was to evaluate LC 50 values of deltamethrin on Nile tilapia ( Oreochromis niloticus L.) fingerlings and investigate histopathological responses of fish exposed to deltamethrin. The 48 h LC 50 value for Nile tilapia fingerlings was estimated as 4.85 μg/L using static test system. In addition, behavioral changes at each deltamethrin concentration were observed closely. All fish, exposed to 5 μg/L deltamethrin revealed severe morphological alterations in the gills and liver. In the gills hyperemia, fusion of secondary lamellae and telangiectasis were observed; whereas hydropic degenerations in liver were observed in all examined fish. The results are significant for reporting acute deltamethrin toxicity in terms of behavioral and histopathological changes: Deltamethrin is highly toxic to fingerlings. © 2006 Wiley Periodicals, Inc. Environ Toxicol 21: 614–620, 2006.