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Ilham Zulfahmi
Ridwan Affandi
Djamar T.F. Lumban Batu


The aims of this study are to examine the changes in biometric variables of nile tilapia caused by mercury exposure. The study was conducted from February to June 2013. Test fish were exposed to 0 mg L-1, 0.164 mg L-1, and 0.196 mg L-1 mercury chloride for 56 days. Analysis was done for the survival rate, growth rate, hepatosomatic index, the relative bile volume, gonadal somatic index, fecundity, and oocyte diameter. The median lethal concentration (96 hrs, LC50) of mercury chloride was calculated as 1.64 mg L-1. The survival rate was highest in the control treatment (46.67%). Mercury chloride with concentration 0.196 mg L-1 shows significant effect to changes HSI and relative bile volume, and oocyte diameter of Nile tilapia (p<0.05). Mercury chloride with a concentration of 0.164 mg L-1and 0.196 mg L-1 have not a significant effect on the growth rate of weight, gonadal somatic index, and fecundity of nile tilapia (p>0.05).



Penelitian ini bertujuan untuk mengkaji perubahan beberapa variabel biometrik ikan nila akibat dari paparan merkuri. Penelitian dilakukan dari bulan Februari hingga Juni 2013. Ikan nila berukuran panjang 11-13 cm dengan bobot rata-rata 20 gram dipaparkan pada tiga konsentrasi merkuri klorida (0 mg L-1; 0,164 mg L-1; dan 0,196 mg L-1) selama 56 hari. Analisis dilakukan terhadap tingkat kelangsungan hidup, laju pertumbuhan bobot, indeks hepatosomatik (HSI), volume empedu relatif, indeks kematangan gonad, fekunditas dan diameter telur. Hasil penelitian menunjukkan bahwa nilai LC50-96 jam merkuri klorida adalah sebesar 1,64 mg L-1. Tingkat kelangsungan hidup tertinggi terdapat pada perlakuan 0 mg L-1 (46,67%) dan terendah pada perlakuan 0,196 mg L-1 (40,00%). Merkuri klorida dengan konsentrasi 0,196 mg L"1 memberikan pengaruh yang nyata terhadap perubahan HSI dan volume empedu relatif serta ukuran diameter telur ikan nila (p<0,05). Namun pada konsentrasi 0,164 mg L-1dan 0,196 mg L-1 merkuri klorida tidak ber-pengaruh nyata terhadap laju pertumbuhan bobot, indeks kematangan gonad (IKG) dan fekunditas ikan nila (p>0,05).

hepatosomatic index (HSI); mercury chloride; acute toxicity;

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