Open AccessDetermination of thermal tolerance parameters of swordtail (Xiphophorus helleri) and platy fish (X. maculatus) acclimated to different temperature levels
Author(s) -
Mahmut Yanar,
A. Özdeş,
Erhan Erdoğan,
Ece Evliyaoğlu
Publication year - 2021
Publication title -
su ürünleri dergisi
Language(s) - English
Resource type - Journals
eISSN - 2148-3140
pISSN - 1300-1590
DOI - 10.12714/egejfas.38.2.12
Subject(s) - platy , xiphophorus , biology , acclimatization , fish <actinopterygii> , oreochromis , zoology , fishery , ecology
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.