Genesis 1:20
“And God said, Let the waters bring forth abundantly the moving creature that hath life, and fowl that may fly above the earth in the open firmament of heaven.”
KJV
Read in Genesis 1Meaning
The waters and sky are called to become inhabited by abundant animal life. The chapter shifts from forming environments to filling them with living movement.
Read carefully
The categories of sea creatures and flying creatures are narrative groupings rather than a modern zoological classification scheme.
Reflection
Abundance is part of the chapter's vision of a good world. Life is not portrayed as a scarce afterthought but as something creation is enabled to teem with.