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Silvertip tetra
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Silvertip tetra : ウィキペディア英語版
Silvertip tetra

Silvertip tetra (''Hasemania nana'') are freshwater tetra fish native to blackwater rivers in Brazil. Silvertip tetras are slightly more aggressive than other comparable smaller tetras, observed occasionally to nip other similarly sized tetras.
==Description==

The males have a copper color, the females are more pale and silvery. Both have white tips on the fins, hence the name. They differ from most other tetras by lacking a small second dorsal (adipose) fin. Silvertip tetras have a black area at the base of their caudal fin. The fish are transparent except for that fact that their bodies have an overall copper sheen. During the night, the copper and black become silver as the fish rests — the color is reactivated once the fish becomes active in the morning. It grows to approximately in overall length. Other than coloration, sexual dimorphism is slight, the female having a very slightly larger belly.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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