The study of the toxic efects of mercury-II-chloride to chub Leuciscus cephalus (L., 1758)

Civa birçok su ortamında bulunan en zararlı ağır metallerden biridir. Bu çalışma, civa-II-kloriir'ün tatlısu kefali (Leuciscus cephalus) bireylerindeki akut toksisitesi ve davranış değişimlerinin belirlenmesini amaçlamaktadır. Denemelerde kullanılmak üzere tatlısu kefali balıklan seçilmiş ve Sakarya nehri Kirmir çayından yakalanmıştır. Her bir civa-II-klorür konsantrasyonundaki davranış değişimleri kaydedilmiştir. Deneyler 3 defa tekrarlanmıştır. Denemeler süresince su sıcaklığı 22±l°C'de sabit tutulmuştur. Civa-II-kloriir'ün 96 saatlik LC50 değeri Leuciscus cephalus bireylerinde probit analiz yöntemine göre 0,55 mg/L (0,53-0,57) bulunmuştur. Toksik maddenin konsantrasyonu arttıkça balıkların davranışlarında önemli değişimler olduğu gözlemlenmiştir.

Civa-II-klorür' ün tatlısu kefali Leuciscus cephalus (L., 1758) üzerindeki akut toksik etkilerinin araştırılması

Mercury is one of the most harmful heavy metals, present in many aquatic media. This study was aimed to determine the acute toxicity of mercury-II-chloride and behavioral changes in Leuciscus cephalus (L., 1758). Leuciscus cephalus were selected for the bioassays experiments and caught in Kirmir branch of Sakarya river. Behavioral changes at each mercury-II-chloride concentration were recorded. The experiments were repeated 3 times. Water temperature was regulated at 22±1°C. The 96-h LC50 value of mercury-II-chloride (HgCl2.H20) on Leuciscus cephalus was found to be 0.55 mg/L (0.53-0.57) according to Probit Analysis. There were significant changes observed in the behavior of the fish as the concentration of the toxic compound increased.

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