Islamic Interpretation of Dreams (Ibn-i Sirin):
(Fish; Jonah; Sea life) In a dream, a whale represents an oath, the temple of righteous people and the prayer mat of the devotees.
Seeing a whale in a dream also means strains, depression, loss of rank, or a growing anger.
Seeing the whale which swallowed God’s prophet Jonah (uwbp) in a dream means dispelling one’s fears, prosperity for a poor person and the coming relief for someone in distress.
In a dream, a whale also represents the chief minister of sea life, while the ocean represents the king or the ruler.
(Also see Fish)