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The level of oxygen must not be less than ______?

آکسیجن کی سطح ______ سے کم نہیں ہونی چاہیے؟

Answer: 5ppm

Explanation
  • Fish require a minimum oxygen level of 5 ppm to survive and perform essential biological functions.
  • Oxygen levels below this threshold can lead to stress, reduced growth, and even death in fish.
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