Some signs of a stressed fish include:
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Erratic swimming patterns
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Loss of appetite
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Changes in coloration
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Gasping at the water surface
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Clamped fins
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Resting at the bottom of the tank
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Aggressive behavior towards tank mates
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Excessive hiding
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Twitching or flashing movements
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Rubbing against objects in the tank
It's important to identify and address the cause of stress in fish to ensure their well-being and overall health.