Castorseed futures for January declined by Rs 39, or 1.06%, to Rs 3,640 per quintal in 3,500 lots.
At the National Commodity and Derivatives Exchange counter, the February contract lost Rs 1, or 0.03%, to Rs 3,714 per quintal in 1,32,510 lots.
Profit-booking by speculators at prevailing higher levels affected the trade.
