Physiological and histological changes in Tilapia zillii [Gerv.] exposed to sublethal concentrations of the effluent of the Egyptian Copper Works

• Autorzy: Mourad M , Wahby O.

Warianty tytułu

PL

Fizjologiczne i histologiczne zmiany u tilapii [Tilapia zillii Gerv.] pod wplywem subletalnej koncentracji wody zrzutowej z Egipskich Zakladow Miedziowych

• Języki publikacji: EN

Abstrakty

EN

The physiological and histological changes in Tilapia zillii (Gerv.) after exposure to sublethal concentrations of the effluent of the Egyptian Copper Works have been investigated. The results of acute toxicity test showed that the LC50 was 25 cm3/dm3, which means that this waste water is highly toxic. The results of physiological and histological changes in Tilapia zillii (Gerv.) showed that, fish were under considerable stress during exposure to sublethal doses of this waste water. Physiological response of fish revealed a significant disturbances in respiratory system, fish metabolism, and ionic osmoregulation. Pathological changes attributed to heavy metals were observed in the gills, liver, and kidney. Bioaccumulation of copper was highest in the liver, followed by the gills, and flesh. It is concluded that the waste water of the Egyptian Copper Works was not acceptable to discharge to drainage canal. Moreover, this plant should institute appropriate in-plant control to reduce emission of heavy metals.

PL

Badano fizjologiczne i histologiczne zmiany u tilapii (Tilapia zillii Gerv.) powstałe w wyniku działania nieoczyszonych ścieków pochodzących z Egipskich Zakładów Miedziowych w Aleksandrii. Test toksyczności LC50-96h wykazał, że koncentracja letalna ścieków dla tilapii wynosi 25 cm3/dm3 wody. W subletalnej koncentracji (2.5; 5.0 cm3/dm3) stwierdzono następujące zmiany we krwi - wzrost hematokrytu, białka, glukozy, jonów Na+ i K+. W mięśniach - spadek zawartości białka. Badania histologiczne wykazały: w skrzelach rozrost, zwiększenie liczby komórek; w wątrobie nacieczenie komórkami tłuszczowymi; w nerce kanalik nerkowy uległ destrukcji, wystąpił obrzęk. W wątrobie stwierdzono statystycznie wysoce istotny wzrost zawartości miedzi, natomiast w skrzelach i mięśniach umiarkowany.

Słowa kluczowe

PL

Egipskie Zaklady Miedziowe; scieki przemyslowe; Cochlidae; zmiany histologiczne; Tilapia zilli; ichtiologia; pielegnicowate; ryby; zmiany fizjologiczne

• Wydawca: -
• Czasopismo: Acta Ichthyologica et Piscatoria
• Rocznik: 1999
• Tom: 29
• Numer: 2
• Opis fizyczny: s.73-80,tab.,fot.,bibliogr.

Twórcy

autor

Mourad M

• National Institute of Oceanography and Fisheries, Alexandria, Egypt

autor

Wahby O.

Bibliografia

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