<![CDATA[Betta fish (Betta sp.) are freshwater fish that are widely kept as ornamental fish and are known to have quite good adaptability to the environment. However, water quality and type remain important factors that influence the survival and growth of Betta fish. This study aims to determine the effect of water type on the survival of Betta fish (Betta sp.). The study was conducted experimentally for five days in the Biology Laboratory, Department of Biology, Faculty of Mathematics and Natural Sciences, Padang State University. Three Betta fish were used as research objects, each kept in different water media, namely regular water (tap water), nano water, and AC water. The parameters observed included fish survival, behavioral changes, physical condition, and water quality including temperature, pH, and dissolved oxygen levels. The results showed that Betta fish kept in nano water showed the most optimal conditions, characterized by better growth in body weight and length and a high survival rate. Betta fish in regular water also showed good survival, although they required water management to reduce chlorine content. Meanwhile, Betta fish kept in AC water showed lower survival and growth rates, as well as signs of stress due to an imbalance in mineral content. Therefore, it can be concluded that water type influences Betta fish survival, and nano water was the most effective maintenance medium in this study.]]>
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