Mahmut YANAR, Ali ÖZDEŞ, Erhan ERDOĞAN, Ece EVLİYAOĞLU

Farklı alıştırma sıcaklıklarında kılıçkuyruk (Xiphophorus helleri) ve plati balıklarının (X. maculatus) termal tolerans parametrelerinin belirlenmesi

Çalışmada üç alıştırma sıcaklığında kılıçkuyruk (Xiphophorus helleri) ve platinin (X. maculatus) termal tolerans parametreleri belirlenmiştir. 20, 24 ve 28°C alıştırma sıcaklıklarında platinin kritik termal minimum (CTMin) değerleri sırasıyla 9,41, 10,42 ve 11,95°C iken, kılıçkuyruğun 9,38, 11,53 ve 13,23°C platinin kritik termal maksimum (CTMax) değerleri 37,41, 39,19 ve 40,52°C iken, kılıçkuyruğun 36,94, 38,89 ve 40,07°C olarak gerçekleşmiştir. Buna göre alıştırma sıcaklıkları balıkların alt ve üst sıcaklık toleranslarını 3-4 °C etkilemiştir. CTMin alıştırma tepki oranı (ARR) değerleri alıştırma sıcaklıklarına bağlı olarak kılıçkuyrukta 0,42-0,42, platide 0,20-0,34 arasında değişirken, CTMax ARR değerleri kılıçkuyrukta 0,29-0,48, platide ise 0,33-0,44 arasında değişmiştir. Platinin termal tolerans poligon alanı (232°C2 ) kılıçkuyruktan (217,3°C2 ) biraz daha geniş bulunmuştur. İki balık türünün alt sıcaklık toleranslarının düşük olması, kışın su sıcaklığının 10°C’ye düştüğü subtropikal iklimlerde bu balıkların coğrafik dağılımlarını ve yetiştiriciliklerini sınırlar.

Determination of thermal tolerance parameters of swordtail (Xiphophorus helleri) and platy fish (X. maculatus) acclimated to different temperature levels

Thermal tolerance parameters of swordtail (Xiphophorus maculatus) and platy (X. helleri) at three acclimation temperatures were determined in the study. The CTMin values at 20, 24 and 28°C acclimation temperature were 9.41,10.42 and 11.95°C respectively for platy and 9.38,11.5 and 13.23°C for swordtail, while CTMax values were 37.41, 39.19 and 40.52°C for platy and 36.94, 38.89 and 40.07°C for swordtail. Accordingly, acclimation temperature affected the lower and upper temperature tolerances of fish by 3-4 °C. The CTMin ARR values varied between 0.42-0.42 in swordtail and 0.20-0.34 in platy, while CTMax ARR ranged between 0.29-0.48 in swordtail and 0.33-0.44 in platy depending on acclimation temperature. Thermal tolerance polygon area of platy (232°C2 ) was slightly higher than that of swordtail (217.3°C). The fact that both fish species have lower temperature tolerances limits their geographic distribution and aquaculture in subtropical climates where the water temperature drops to 10°C in winter.

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