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Bu calismada, Ege Denizi’nde (Turkiye’nin batisi) yaygin bulunan echinoderm turlerinden Paracentrotus lividus’ un fekondite ve gonad indeksi ozetlenmistir. Cesme kiyisal alandan aylik olarak Paracentrotus lividus toplanarak biyometrik olcumleri yapildiktan sonra kesme islemi gerceklestirilmistir. Gonad indeksleri hesaplanmistir. Ortalama fekondite (yumurta sayisi) belirlendi ve yumurta capi olculmustur. Ortalama yumurta capi 91.14±1.46 µm. Fekondite Mart ayinda pik yapti (346.582 eggs/female) ve iliskili olarak gonad indeksi (11.02±0.54 %) ve yumurta boyu da  (95.68±01.98 µm) bu ayda en yuksekti. Buradaki sonuclar, aylara gore yumurta sayisi ve yumurta boyunda onemli bir farklilik (p<0.05) oldugunu gostermistir.

Quantitative and qualitative observations of European sea urchin (Paracentrotus lividus, Lamarck 1816) gonad in Cesme Bay, Izmir, Turkey