Cross reference
Exodus 7:21
21 and the fish which `is' in the River hath died, and the River stinketh, and the Egyptians have not been able to drink water from the River; and the blood is in all the land of Egypt.
Exodus 7:18
18 and the fish that `are' in the River die, and the River hath stank, and the Egyptians have been wearied of drinking waters from the River.'
Revelation 8:9
9 and die did the third of the creatures that `are' in the sea, those having life, and the third of the ships were destroyed.