Effects of long-term extended photoperiod on somatic growth and husbandry parameters on cultured gilthead seabream (Sparus aurata, L.) in the net cages

Bu çalışmada, uzun fotoperiyot rejiminin (15L:9D) yetiştiriciliği yapılan çipura (Sparus aurata) balıklarının somatik gelişimleri üzerine olan etkileri araştırılmıştır. Denemeler 14 m ağ derinliğinde ve 20 m çapında, yüksek yoğunluklu polietilen (YYPE) ağ kafeslerde gerçekleştirilmiştir. Deneme ve kontrol grupları için her bir kafese, ortalama ağırlıkları, sırasıyla 78,91±8,54 g ve 71,39±4,06 g olan yaklaşık 180.000 adet çipura konulmuştur. 13 ay boyunca deneme grubu kafeslerine ilave aydınlatma uygulanırken kontrol grubu kafesine ilave aydınlatma uygulanmamıştır. Çalışma sonunda, deneme grupları 425,19±5,06 g ortalama canlı ağırlığa ulaşırken (toplam n=362.676), kontrol grubunun canlı ağırlığı 305,42±25,01 g (toplam n=345,829) olduğu saptanmıştır. Bununla birlikte, deneme gruplarında ve kontrol grubunda yem dönüşüm oranı (YDO) sırasıyla 2,04 ve 2,37 olarak hesaplanmış olup her iki grup arasında önemli farklılıklar tespit edilmiştir (P

Anahtar Kelimeler:

fotoperiyot, yem çevirimi, gonadosomatik indeks

Yapay aydınlatma ile gün ışığı süresinin uzatılmasının ağ kafeslerde yetiştiriciliği yapılan çipuraların (Sparus aurata) gelişimleri üzerine etkileri

In this study, the effects of the long photoperiod regime (15L:9D) on both somatic growth and husbandry parameters were investigated in growing gilthead seabream (Sparus aurata). Experiments were conducted in high density polyethylene (HDPE) floating cages which have net depths of 14 m and diameters of 20 m. They contained approximately 180,000 gilthead seabream with average weights of 78.91±8.54 g and 71.39±4.06 g for experimental and control groups, respectively. Additionally, artificial illumination was applied to experimental cages for 13 months, while it was not performed on the control group. At the end of the experiments, fishes of experimental groups reached to 425.19±5.06 g on average (total n=362,676), while this value was estimated as 305.42±25.01 g (total n=345,829) on average in control groups (P<0.05). In addition, feed conversion ratio (FCR) was calculated as 2.04 and 2.37 for experimental and control groups, respectively, however significant differences were found between these groups (P<0.05). Moreover, gonadal weight of fish in the control group was significantly higher than the experimental group. Gonadosomatic index was recorded as 0.36 % in the control group and 0.15 % in the experimental group (P<0.05).

Keywords:

photoperiod, feed conversion, gonadosomatic index,

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