Dagah is the collective feminine noun for fish, related to dag (a single fish). It appears in key theological passages: in the Aaronic blessing ('multiply like fish'), in Jonah's great fish (dag gadol), and in Ezekiel's prophecy of the Dead Sea coming to life. Fish represent teeming, fruitful life. In the New Testament, fish symbolize the kingdom harvest — Jesus calls his disciples to be fishers of men.
Fish symbolism flows through Scripture from creation (Genesis 1:28) to the messianic feast (John 21:9-13). Jonah's fish is an instrument of both judgment and rescue — a belly of death that becomes a womb of commission. Ezekiel's vision of fish multiplying in the Dead Sea (Ezekiel 47:9-10) pictures impossible life where nothing could live. The risen Christ serves fish on the shore, restoring broken disciples. In every case, dagah signals the miraculous multiplication of life.