Lucy monitors the position of a fish in the ocean. The fish swims at 30 ft below sea level and rises 18 ft. What is the position of the fish?

1. Start with the fish's initial position: -30 \, \text{ft}
2. Calculate the fish's position change, which is a rise of 18 feet: -30 + 18
3. Final position of the fish: -12 \, \text{ft}

So, the position of the fish is -12 \, \text{ft} .