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Effects of rearing temperature on the body shape of swordtail (Xiphophorus hellerii) during the early development using geometric morphometrics
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Effects of rearing temperature on the body shape of swordtail (Xiphophorus hellerii) during the early development using geometric morphometrics
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Effects of rearing temperature on the body shape of swordtail (Xiphophorus hellerii) during the early development using geometric morphometrics
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Journal Article
Effects of rearing temperature on the body shape of swordtail (Xiphophorus hellerii) during the early development using geometric morphometrics
2015
Overview
Temperature, as an environmental factor, plays an important role in life of fishes. This study was conducted to investigate effects of temperature on body shape of swordtail (Xiphophorus hellerii) during the early development using geometric morphometrics. A total of 60 newly-born fries were reared in two temperature treatments (17 and 26°C) for two months. The left side of the specimens were then photographed, 16 landmarks were defined and digitized using the software tpsDig2 to extract the body shape data. The extracted data were superimposed using generalized procreates analysis, analyzed using the discriminant function analysis and Hoteling's T2. There was a significant difference between body shape of the specimens exposed to the temperature treatments with those experienced higher temperature had a deeper head at the level of the operculum, deeper body depth and caudal peduncle, and shorter tail length. The results indicated that temperature is an important environmental parameter impacting the body shape of green swordtail during the early developmental stage.
