Answer: Fish will experience difficulty in breathing.
Step-by-step explanation:
Oxygen is a necessary element that is required for respiration in plants, animals and other organisms. It is necessary for cellular metabolism. It helps in breakdown of food into simple substances.
According to the given situation, the fish will experience difficulty in breathing is the correct option. This is because of the fact that the dissolved oxygen is necessary for respiration and survival of aquatic animals in water habitat. In the absence of dissolved oxygen the fish or any other aquatic animal will not survive.