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    Öğe
    Çeşme Körfezi’ndeki Avrupa Deniz Kestanesi gonadının (Paracentrotus lividus, Lamarck 1816) kalitatif ve kantitatif incelenmesi
    (2017) Küçükdermenci, Aysun; Lök, Aynur; Acarlı, Sefa; Yiğitkurt, Selçuk; Kırtık, Ali; Kurtay, Evrim
    Bu çalışmada, Ege Denizi'nde (Türkiye'nin batısı) yaygın bulunan echinoderm türlerinden Paracentrotus lividus'un fekondite ve gonad indeksi özetlenmiştir. Çeşme kıyısal alandan aylık olarak Paracentrotus lividus toplanarak biyometrik ölçümleri yapıldıktan sonra kesme işlemi gerçekleştirilmiştir. Gonad indeksleri hesaplanmıştır. Ortalama fekondite (yumurta sayısı) belirlendi ve yumurta çapı ölçülmüştür. Ortalama yumurta çapı 91.14±1.46 µm. Fekondite Mart ayında pik yaptı (346.582 eggs/female) ve ilişkili olarak gonad indeksi (11.02±0.54 %) ve yumurta boyu da (95.68±01.98 µm) bu ayda en yüksekti. Buradaki sonuçlar, aylara göre yumurta sayısı ve yumurta boyunda önemli bir farklılık (p<0.05) olduğunu göstermiştir
  • [ X ]
    Öğe
    Quantitative and qualitative observations of European sea urchin (Paracentrotus lividus, Lamarck 1816) gonad in Cesme Bay, Izmir, Turkey
    (Ege Univ, 2017) Kucukdermenci, Aysun; Lok, Aynur; Acarli, Sefa; Yigitkurt, Selcuk; Kirtik, Ali; Kurtay, Evrim
    This study examined fecundity, by means of the gonad index of the most common and abundant echinoderm species (Paracentrotus lividus) of the Aegean Sea (western Turkey). Paracentrotus lividus samples were collected monthly at the coast of Cesme for six months and biometric parameters were measured and then the animals' dissected. Gonad indices were calculated. The mean fecundity (number of eggs) was determined and eggs diameter were measured. Mean egg diameter was 91.14 +/- 1.46 mu m. There was a peak in fecundity in March (346.582 eggs/female) that correlated with the observed peak in GSI (11.02 +/- 0.54 %) and egg size (95.68 +/- 01.98 mu m). The results presented here show that a significant different was found in egg numbers and egg sizes between months (p<0.05).
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    Öğe
    Spat efficiency in the pearl oyster Pinctada radiata (Leach, 1814) in the surface and bottom water at Karantina Island
    (Walter De Gruyter Gmbh, 2020) Yigitkurt, Selcuk; Lok, Aynur; Kirtik, Ali; Acarli, Sefa; Kurtay, Evrim; Kucukdermenci, Aysun; Durmaz, Yasar
    The present study was carried out to determine the spat efficiency in the pearl oyster (Pinctada radiata, Leach, 1814) in surface and bottom water at Karantina Island (Izmir/ Turkey). Polyethylene mesh bags were used as collectors. An annual average of 175.16 +/- 11.32 spat m(-2) was obtained from PSC (placed surface collectors) and 82.65 +/- 3.89 spat m(-2) was obtained from PBC (placed bottom collectors). The largest number of new spat attachments occurred in August, both on PSC and PBC: 44 +/- 3.46 and 26 +/- 2.88 spats were found respectively in the outer and inner mesh bags of PSC, and 33 +/- 5.77 and 48 +/- 6.92 spats were found respectively in the outer and inner mesh bags of PBC. New spat attachments (10 mm) continued throughout the study period, except April and May. Adult pearl oysters (50 mm) were found in May. There was a significant difference between PSC and PBC in the total number of spat attachments, the monthly spat attachments and the first spat attachments (p < 0.05). The total number of new spat attachments was positively correlated with temperature and chlorophyll a for both depths (p<0.05).