Farklı ışık yoğunluklarının fangri (Pagrus pagrus, L. 1758) larvalarında gelişime olan etkileri

Fangri, (Pagrus pagrus) balığının larval döneminde (0-35 gün) 3 farklı ışık yoğunluğunun larval gelişime olan etkilerinin incelendiği bu çalışma, Nisan-Mayıs 2004 tarihleri arasında özel bir işletmede yürütülmüştür. 3 tekrarlı ve açık devre sistemde yeşil su üretim tekniği uygulanan çalışmada; 10,30 ve 100 lüks olmak üzere 3 farklı ışık yoğunluğu kullanılmış ve tanklar sırasıyla A, B ve C olarak adlandırılmıştır. Tamamen toz yeme geçişin yapıldığı 35. gün sonunda, larvalara ait total boy ve ağırlık gelişimleri incelendiğinde, en iyi total boy 18.67±2.3 mm ve 93.97±8.5 mg ağırlık olarak, 30 lüks ışık yoğunluğunun uygulandığı B grubunda elde edilmiştir. Bu grubu 18.12±2.1 mm total boy ve 89.63±6.3 mg ağırlık değeri ile 100 lüks ışık yoğunluğunun uygulandığı C grubu ve 16.35±1.9 mm total boy ve 72.41±7.9 mg ağırlık değeri ile 10 lüks ışık yoğunluğunun uygulandığı A grubu izlemiştir. Total boy ve ağırlık gelişimi açısından, A grubunda önemli faklılıklar belirlenmesine rağmen (p0.05). Ayrıca hava kesesi gelişim oranı gruplarda sırası ile %92, %95 ve %93 olarak hesaplanmıştır. A, B ve C gruplarındaki hava kesesi gelişimleri incelendiğinde ise gruplar arasında istatistik olarak farklılığa rastlanmamıştır (p>0.05). Bunun yanında, yaşama oranları ise gruplara göre sırası ile % 12.4, % 24.5 ve % 22.6 olmuştur. Benzer şekilde, B ve C grupları arasındaki fark istatistik olarak önemsiz iken (p>0.05), A grubu ise diğer gruplardan farklıdır (p

Effects of different light intensities on the larval development of the red porgy (Pagrus pagrus, L. 1758) larvae

The influences of three different light intensities on the larval development during larval period (0-35 day) in the red porgy (Pagrus pagrus) larvae were investigated in private hatchery between April-May 2004. Three different light intensities were compared in triplicate as 10, 30 and 100 lx and named group A, B and C; green water technique was carried out in the circulated system. It was determined that the best total length development and weight was found as 18.67±2.3 mm and 93.97±8.5 mg in group B applied 30 lx light intensity. Also, these parameters were determined as 18.12*2.1 mm and 89.63±6.3 mg for group C applied 100 lx light intensity and 16.35±1.9 mm and 72.41±7.9 mg for group A applied 10 lx light intensity. Although significant differences were found in group A (p0.05) in total length development and weight. Also, swimbladder inflation rates were calculated as 92%, 95 % and 93% respectively. There were no significant differences between the groups for swimbladder development and inflation rates (p>0.05). Additionally, survival rates occurred as 12.4%, 24.5% and 22.6% respectively. Similarly, differences between group B and C were not significant (p>0.05), whereas group A was significantly different than the other groups (p

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