Critical thermal maxima (CTMax) and minima (CTMin) were determined for Turkish crayfish (Astacus leptodactylus) acclimated to 15, 20 and 25°C. CTMin and CTMax were 1.3, 1.1 and 2.0°C, and 37.4, 37.5 and 38.7°C, respectively. Thermal tolerance tests showed that acclimation temperatures (15, 20 and 25C) had significant effects on CTMin values of A. leptodactylus (P≤0.05). The area of thermal tolerance assessed using the CTMin and CTMax boundaries were calculated as 364°C2 . The overall ARR values were calculated as 0.07 for CTMin and 0.13 for CTMax values between 15 and 25 C acclimation tempera-tures. All the crayfish crumpled at 0.5°C and showed overall spasm at 32.0 – 33.0°C. Farming A. leptodactylusin the southeastern part of the Mediterranean region may be practiced in terms of temperature tolerance.
15, 20 ve 25 °C’ye alıştırılan Türk kereviti için kritik termal maksima (CTMax) ve minima (CTMin) değerleri belirlenmiştir. CTMin ve CTMax değerleri sırasıyla 1,3, 1,1 ve 2,0 ile 37,4, 37,5 ve 38,7 °C’dir. Sıcaklık tolerans testleri alıştırma sıcaklıklarının (15, 20 ve 25 °C) A. leptodactylus CTMin değerlerine önemli etkilerde bulunduklarını göstermiştir (P≤0,05). Sıcaklık tolerans alanı CTMin ve CTMax sınırları ile değerlendirilerek 364°C2 olarak hesaplanmıştır. Genel olarak 15 ile 25 C arası alıştırma sıcaklıklarında, alıştırma tepki oranı (ARR) 0,07 ile 0,13 olarak hesaplananmıştır. Kerevitlerin tamamı 0,5 °C’de kıvrılma ve geneli 32,0- 33,0°C’de kasılma göstermiştir. Akdeniz bölgesinin güneydoğu kesiminde A. leptodactylus yetiştiriciliği sıcaklık toleransı açısından uygun olabilir.
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