egejfas Ege Journal of Fisheries and Aquatic Sciences 2148-3140 Ege University 10.12714/egejfas.38.2.12 Fisheries Management Balıkçılık Yönetimi Determination of thermal tolerance parameters of swordtail (Xiphophorus helleri) and platy fish (X. maculatus) acclimated to different temperature levels Farklı alıştırma sıcaklıklarında kılıçkuyruk (Xiphophorus helleri) ve plati balıklarının (X. maculatus) termal tolerans parametrelerinin belirlenmesi https://orcid.org/0000-0002-4445-0228 Yanar Mahmut ÇUKUROVA ÜNİVERSİTESİ, SU ÜRÜNLERİ FAKÜLTESİ, SU ÜRÜNLERİ YETİŞTİRİCİLİĞİ BÖLÜMÜ https://orcid.org/0000-0002-0271-2445 Özdeş Ali ÇUKUROVA ÜNİVERSİTESİ, SU ÜRÜNLERİ FAKÜLTESİ, SU ÜRÜNLERİ YETİŞTİRİCİLİĞİ BÖLÜMÜ https://orcid.org/0000-0002-3013-3045 Erdoğan Erhan MUNZUR ÜNİVERSİTESİ, SU ÜRÜNLERİ FAKÜLTESİ, SU ÜRÜNLERİ YETİŞTİRİCİLİĞİ BÖLÜMÜ https://orcid.org/0000-0003-3578-7336 Evliyaoğlu Ece ÇUKUROVA ÜNİVERSİTESİ, SU ÜRÜNLERİ FAKÜLTESİ, SU ÜRÜNLERİ YETİŞTİRİCİLİĞİ BÖLÜMÜ 06 15 2021 38 2 223 228 10 14 2020 03 11 2021 Copyright © 1984, Ege Journal of Fisheries and Aquatic Sciences 1984 Ege Journal of Fisheries and Aquatic Sciences

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 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 is limits their geographic distribution and aquaculture in subtropical climates where the water temperature drops to 10 °C in winter.

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.

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