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| Q. |
Why death of fish is more common during summer than in winter? It is because of – |
| A. | shortage of food |
| B. | concentration of toxins |
| C. | depletion of oxygen |
| D. | spread of diseases |
| Answer» C. depletion of oxygen | |
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Explanation: Fish die more in summer due to oxygen depletion which refers to low levels ofdissolved oxygen (DO) in water. Warm water is much less capable of holding oxygen has in solution than cool water. For example, water that is 900 F can only hold 7.4 mg/L DO at saturation, whereas water that is 450 F can hold 11.9 mg/L DO at saturation. This physical phenomenon puts the fish in double jeopardy because at high water temperatures their metabolic rates increase, hence their physiologic demand for oxygen increases. |
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