Container freight rates from China to the United States have seen their largest fall in two years, as the most profitable peak season in history draws to a close.

If the lower rates last, it could ease headaches for shippers of seafood and other goods created by the 20-month-long shipping container crisis.

Prices could, however, rebound if efforts to ease congestion in US ports fail and demand from Chinese shippers picks up ahead an early Lunar New Year, according to analysts.