Migration patterns from "summary" of BEAUTIFUL SWIMMERS by WILLIAM W. WARNER
The blue crab moves from deep water to shallow water in early spring to mate and lay eggs. Females migrate far up rivers and creeks to release their eggs in high salinity water. After mating, male crabs return to deeper water while females stay in shallow water until their eggs hatch. Young crabs remain in shallow water for several weeks before moving back to deeper water. In late fall, adult crabs migrate to deeper water to escape cold temperatures. They bury themselves in mud to hibernate, staying there until water warms up again in the spring. In the summer, crabs move back to shallow water to feed and mate. This migration pattern is driven by the need to find suitable conditions for mating, egg laying, and hibernation. The timing of migration is influenced by water tempe...
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