Assessment of temperature effects on body shape in Nile tilapia, Oreochromis niloticus juveniles using the truss network system
Publish place: Caspian Journal of Enviromental Sciences، Vol: 19، Issue: 4
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_CJES-19-4_004
تاریخ نمایه سازی: 31 خرداد 1403
Abstract:
Among the environmental factors, water temperature has a significant effect on many aspects of fish life. This study was carried out to examine effects of water temperature on body shape of Nile tilapia, Oreochromis niloticus during the early stages of life using truss network system. A total of ۱۵۰ newly-born fry were reared in three temperature treatments (۲۲, ۲۸ and ۳۴°C) for ۴۰ days. At the end of experiment, the left side of the specimens was photographed. To achieve the body shape data, ۱۳ landmark-points were digitized using tpsDig۲ software. The extracted data were justified with generalized procrustes analysis, then the differences of body shape among groups were investigated using the principal component analysis (PCA), canonical variate analysis (CVA) and cluster analysis (CA). There were significant differences in body shape of the treatments. The results of CVA and CA indicated that one of the important factors in the aquatic habitats is water temperature that influences the body shape of the Nile tilapia during the first stages (larval and juvenile stages) of growth.
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Authors
Mazaher Zamani-Faradonbe
Department of Natural Resources (Fisheries Division), Isfahan University of Technology, Isfahan, Iran
Yazdan Keivany
Department of Natural Resources (Fisheries Division), Isfahan University of Technology, Isfahan, Iran
Farhad Kermani
Department of Natural Resources (Fisheries Division), Isfahan University of Technology, Isfahan, Iran
Eisa Ebrahimi
Department of Natural Resources (Fisheries Division), Isfahan University of Technology, Isfahan, Iran
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