Possible meanings are 1) the heavens and the earth are spoken of as if they have emotions like people. AT: "Let it be as if the heavens are glad and the earth rejoices" or 2) "the heavens" and "the earth" are metonyms for those who dwell in those places. AT: "Let those who live in the heavens be glad and let those who live on the earth rejoice" (See: [[rc://en/ta/man/translate/figs-personification]] and [[rc://en/ta/man/translate/figs-metonymy]])
The implied information is that this refers to all the creatures living in the sea. They are spoken of as if they should shout with joy like people might do. AT: "the sea creatures shout joyfully" (See: [[rc://en/ta/man/translate/figs-explicit]] and [[rc://en/ta/man/translate/figs-personification]])
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