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thing that liveth, which moveth, whithersoever the rivers shall come, shall live: and there shall be a very great multitude of fish, because these waters shall come thither: for they shall be healed; and every thing shall live whither the river cometh.
New Defender's Study Bible Notes
47:9 multitude of fish. All of the fish in the ocean will have died in the great tribulation period (Revelation 16:3). Perhaps God will create new fish life for the millennial period, or else (more likely) some of each kind of the freshwater fish will survive to repopulate the rivers, and possibly the seas (Ezekiel 47:10) with fish.