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الاوكسجين (Oxygen) يعتبر مستوى الاوكسجين المذاب(DO)في الماء احد العوامل المهمه في نوعية المياه التي تربى فيه الاسماك. والنقص الحاصل في الاوكسجين المذاب بالماء يسبب اجهاد وامراض وطفيليات او تموت بعد فتره معينه لانها سوف تفقد الشهيه للغذاء وينخفض معدل النمو وكفاءة التحويل الغذائي. يذوب الاوكسجين في الماء بطريقه الانتشار اثناء عملية التبادل الغازي بين سطح الماء والهواء الجوي وكذلك يذوب الاوكسجين المنتج من الهائمات النباتيه الموجوده في الماء وكذلك النباتات المائيه وبطريقه الانتشار ايضا بعد الحصول عل
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