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  • [ X ]
    Öğe
    Doğadan toplanan Tubifex tubifex’ in mikrobiyal yük seviyesinin kontrollü laboratuvar şartlarında değişimi
    (Emrah ŞİMŞEK, 2020) Çelik, Pinar; Çakır, Fikret
    Bu çalışmada, doğadan toplanan Tubifex tubifex’ler ile 28 gün boyunca kontrollü şartlarda tutulan T. tubifex’lerin mikrobiyolojik yük sevileri karşılaştırılmıştır. Bu amaçla altı farklı deneme grubu oluşturulmuştur. Bu gruplar (1) tank zemininde kum olan ve ultaviole (UV) sterilizasyon işlemi uygulanan grup (1. Grup = KUVL), (2) tank zemininde kum olan ancak UV sterilizasyon uygulanmayan grup (2. Grup = KUVS), (3) tank zemininde çamur olan ve UV sterilizasyon işlemi uygulanan grup (3. Grup = ÇUVL), (4) tank zemininde çamur olan ancak UV sterilizasyon uygulanmayan grup (4. Grup = ÇUVS), (5) tank zemini boş olan ve UV sterilizasyon işlemi uygulanan grup (5. Grup = ZUVL), (6) tank zemini boş olan ancak UV sterilizasyon işlemi uygulanmayan grup (6. Grup = ZUVS) olarak planlanmıştır. Su parametreleri tüm gruplarda sabit tutulmuştur. Denemeler üç tekerrürlü olacak şekilde gerçekleştirilmiş olup her bir gruba 100’er gram canlı T. tubifex stoklanmıştır. Kapalı devre sistemde bir yirmisekiz gün boyunca tutulan T. tubifex’ lerden periyodik olarak (0. gün, 7. gün, 14. gün, 21. gün ve 28. gün) mikrobiyolojik örnekler alınmış ve ölçümler yapılmıştır. Elde edilen bulgulara göre toplam aerob bakteri sayısı (TAB) tüm gruplarda zamana bağlı bir azalma göstermiştir. Bunun yanı sıra ortamdaki mikrobiyolojik bakteri yük miktarının başlangıç anından itibaren 28 günün sonuna kadar sürekli düşüş eğilimi gösterdiği tespit edilmiştir
  • [ X ]
    Öğe
    Farklı Stok Yoğunluklarının Cüce Vatoz, Ancistrus multispinis (Regan, 1912) Yavrularının Büyümesi Üzerine Etkisi
    (Mersin Üniversitesi, 2025) Çelik, İhsan; Çelik, Pinar; Mestav, Burcu; Güleç, Fatih
    This study examined the growth performance of bristlenose pleco (Ancistrus multispinis) fry raised at five different stocking densities. For this purpose, five experimental groups were formed, each consisting of three replicates: 1 fry/L (d1), 2 fry/L (d2), 4 fry/L (d4), 6 fry/L (d6), and 8 fry/L (d8). The experiment used fry produced in the laboratory, with average initial live weights of 0.0275 ± 0.004 g and average total lengths of 1.46 ± 0.049 cm. The study lasted a total of 90 days. At the end of the experiment, the number of live fry in each group was recorded, and weight and length measurements were taken. According to these measure-ments, the average length of the fry in the 1 fry/L group (d1) was 3.1 cm, and the average weight was 0.321 g, while in the 8 fry/L group (d8), the length was found to be 2.8 cm, and the weight was 0.249 g. The size differences between groups were examined, and it was found that the d1 group showed statistically signifi-cant differences when compared to the other groups. The data obtained indicate that fry of A. multispinis grew more in lower stocking densities, such as 1 fry/L, compared to other groups. Based on these results, it can be said that utilizing lower stocking densities, such as 1 fry/L, is advantageous in the growth of A. multis-pinis fry
  • [ X ]
    Öğe
    Larval Development of the Blue Dolphin Cichlid (Cyrtocara moorii Boulenger, 1902): Morphological Changes
    (Mersin Üniversitesi, 2024) Çelik, İhsan; Çelik, Pinar; Yalçın, Bahadır Rıfat
    In this study, the larval development of Cyrtocara moorii was examined morphologically and compared with other Cichlidae species. The important morphological changes and critical developmental stages that C. moorii larvae undergo were determined during the process from hatching up to 20 days. It was observed that the larvae had a large yolk sac, transparent bodies, and undeveloped fins in the first days. Important developmental events such as eye development, mouth opening, onset of free swimming behavior, fin formation, and increased pigmentation were recorded. It was determined that the larvae started free swimming between 6-9 days, the yolk sac was completely depleted on the 10th day, and the larval development was completed, reaching the juvenile form on the 15-20th days. When the larval development of C. moorii was compared with other Cichlidae species, species-specific differences were observed as well as some similarities. It is thought that these differences may be related to the ecological adaptations, reproductive strategies, and evolutionary history of the species. It is suggested that future research should comparatively examine the larval development processes of more Cichlidae species and elucidate the mechanisms underlying this diversity