The potential of Yucca schidigera extract to reduce the ammonia pollution from shrimp farming.

This study investigated the feasibility of using Yucca schidigera extract (YUPE) to reduce ammonia pollution resulting from shrimp farming. YUPE was added at ratios of 18, 36, and 72 mg L(-1) to effluent from an experimental shrimp culture system containing total ammonia nitrogen (TAN) of 0.592, 0.672, and 0.718 mg L(-1). TAN reduction increased with an increase in YUPE, and at 18 mg L(-1) reduced TAN by 71-72% and 86-87% at 6 and 24h, respectively. Shrimp feed containing YUPE at 300, 600, and 1200 mg kg(-1) was submerged, allowing the ammonia to leach out. The addition of YUPE in feed reduced TAN leaching by 50-83% compared with the control. The application of YUPE in water or feed could considerably reduce the accumulation of ammonia in waste water discharge during shrimp production, thereby providing a feasible solution to ammonia pollution in coastal environments.

Yucca schidigera extract--a bioresource for the reduction of ammonia from mariculture.

Extract of a desert plant, Yuccaschidigera (YUPE) at 0 mg L(-1) (control), 18, 36 and 72 mg L(-1) was added to seawater containing 30, 50 and 100 Kuruma shrimp Marsupenaeusjaponicus postlarvae (PL) per liter with or without aeration for 24h to study its effects on reducing ammonia excreted from the PL. Even at the lowest YUPE addition level and the highest PL density, no ammonia accumulated in both aerated and no-aerated set-ups for up to 12h. Ammonia accumulated only in the controls. YUPE showed more effective in reducing ammonia in seawater from this biogenic source than ammonia from chemical source used in previous studies. Consequently, YUPE is identified as a natural, safe, and effective solution for ammonia reduction in seawater and mariculture.