Dissolved oxygen and dietary phosphorus modulate utilization and effluent partitioning of phosphorus in rainbow trout (Oncorhynchus mykiss) aquaculture.
Phosphorus (P) is the limiting nutrient in freshwater primary production, and excessive levels cause premature eutrophication. P levels in aquaculture effluents are now tightly regulated. Increasing our understanding of waste P partitioning into soluble, particulate, and settleable fractions is important in the management of effluent P. When water supply is limited, dissolved oxygen concentration (DO) decreases below the optimum levels. Therefore, we studied effects of DO (6 and 10mg/L) and dietary P (0.7 and 1.0% P) on rainbow trout growth, P utilization, and effluent P partitioning. Biomass increased by 40% after 3 weeks. DO at 10mg/L significantly increased fish growth and feed efficiency, and increased the amount of P in the soluble fraction of the effluent. Soluble effluent P was greater in fish fed 1.0% P. DO increases fish growth and modulates P partitioning in aquaculture effluent.
McDaniel
Nichole K
NK
Department of Pharmacology and Physiology, UMDNJ-New Jersey Medical School, 185 South Orange Avenue, Newark, NJ 07103-2714, USA.
Sugiura
Shozo H
SH
Kehler
Thomas
T
Fletcher
John W
JW
Coloso
Relicardo M
RM
Weis
Peddrick
P
Ferraris
Ronaldo P
RP
D000821:Animal Feed; D000818:Animals; D017756:Aquaculture; D018533:Biomass; D005068:Eutrophication; D005618:Fresh Water; D017686:Oncorhynchus mykiss / Q000254:growth & development / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism*; D010758:Phosphorus / Q000378:metabolism*; D016226:Phosphorus, Dietary / Q000008:administration & dosage; D014874:Water Pollutants, Chemical / Q000378:metabolism*
D016226:Phosphorus, Dietary; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D010100:Oxygen