期刊
ENVIRONMENTAL POLLUTION
卷 140, 期 1, 页码 95-101出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2005.06.020
关键词
aquaculture feeding; phosphorus retention; phosphorus excretion; source reduction; rainbow trout
Excess phosphorus (P) in aquaculture feeds contributes to the eutrophication of natural waters. While commercially available low-P (LP) fish feeds have been developed. there is uncertainty about their potential to reduce effluent P while maintaining fish growth relative to regular P (RP) feeds. We therefore simulated commercial aquaculture conditions and fed for 55 days rainbow trout (similar to 190 kg/raceway, n = 3 raceways/diet) RP (1.4% total P) and LP (1.0%) feeds then determined effluent P levels, fish growth, and feed costs. Excretions of fecal-P and soluble-P, but not particulate-P, in effluents were greater in RP than in LP ponds. Fish growth, bone-P and plasma-P were similar between diets, demonstrating that LP feeds can lower effluent P levels without compromising growth. Costs were $0.97/kg fish production for LP feeds, and $0.74/kg for RP. Because feed is the largest variable cost in commercial aquaculture. the use of LP feeds can significantly increase production costs. (C) 2005 Elsevier Ltd. All rights reserved.
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