SEAFDECINSTITUTIONAL REPOSITORY
    • English
    • ไทย
    • 日本語
    • Bahasa Indonesia
  • English 
    • English
    • ไทย
    • 日本語
    • Bahasa Indonesia
  • Login
View Item 
  •   SEAFDEC Institutional Repository (SIR)
  • 03 SEAFDEC External Publications
  • Journal Articles, Conference Papers and Book Chapters by SEAFDEC Staff
  • Journal Articles
  • AQD
  • View Item
  •   SEAFDEC Institutional Repository (SIR)
  • 03 SEAFDEC External Publications
  • Journal Articles, Conference Papers and Book Chapters by SEAFDEC Staff
  • Journal Articles
  • AQD
  • View Item
JavaScript is disabled for your browser. Some features of this site may not work without it.

Phosphorus utilization in rainbow trout (Oncorhynchus mykiss) fed practical diets and its consequences on effluent phosphorus levels

Thumbnail
View/Open
Request this document
Date
2003
Author
Coloso, Relicardo M.
King, Kim
Fletcher, John W.
Hendrix, Michael A.
Subramanyam, Mark
Weis, Peddrick
Ferraris, Ronaldo P.
Page views
26
Share 
 
Metadata
Show full item record

Cited times in Scopus



Abstract
Excessive dietary phosphorous (P) concentrations in effluents from aquaculture present a major environmental problem. We therefore studied the effect of dietary P and vitamin D3 on P utilization by rainbow trout-fed practical diets and on P concentrations in the soluble, particulate and settleable components of the effluent from fish tanks. Rainbow trout (average weight: 78 g, initial biomass: 13 kg in 0.7 m3 tanks) were fed for 11 weeks, practical diets that varied in total P, available P, and vitamin D3 concentrations. Soluble, particulate (10–200 μm) and settleable (>200 μm) P in the effluent were sampled every 0.5–6 h for 1–3 days in the third and eleventh weeks of the experiment. Trout in all diets more than doubled their weight after 11 weeks. Increasing the concentrations of available dietary P from 0.24% to 0.88% modestly enhanced growth rate. Feed conversion ratio (FCR) and biomass gain per gram P consumed decreased as dietary P concentrations increased. Carcass P, daily P gain, and plasma P concentrations were lower in fish fed with low P diets. Soluble P concentrations in the effluent peaked immediately after and again 4–6 h after feeding, and is a linear function of available dietary P. No soluble P would be produced during consumption of diets containing less than 0.22±0.02% available P. Above this dietary concentration, soluble P would be excreted at 6.9±0.4 mg/day/kg for each 0.1% increase in available dietary P. Particulate P concentrations in the effluent were independent of dietary P concentrations. Settleable, presumably fecal, P concentrations tended to increase with dietary P concentrations. In trout fed with low P (0.24% available P, 0.6% total P) diets, 60% of total dietary P were retained by the fish and the remaining 40% were excreted in the effluent as settleable P (20–30%) and particulate or soluble P (10–20%). In trout fed with high P (0.59–0.88% available P; 0.9–1.2% total P) diets, 30–55% of total dietary P was retained by fish, and the remaining 15–25% appeared in the effluent as settleable P, 20–55% as soluble P, and 5–10% as particulate P. Vitamin D3 did not affect fish growth nor effluent P levels. Physicochemical management of aquaculture effluents should consider the effect of diets on partitioning of effluent P, the peaks of soluble P concentration following feeding, and the contributions of particulate P to total P in the effluent. Increasing our understanding of how dietary P is utilized and is subsequently partitioned in the effluent can contribute significantly towards alleviating this important environmental and industry problem.
URI
http://hdl.handle.net/10862/1956
Suggested Citation
Coloso, R. M., King, K., Fletcher, J. W., Hendrix, M. A., Subramanyam, M., Weis, P., & Ferraris, R. P. (2003). Phosphorus utilization in rainbow trout (Oncorhynchus mykiss) fed practical diets and its consequences on effluent phosphorus levels. Aquaculture, 220(1-4), 801-820.
Subject
Aquaculture effluents; Diets; Feed composition; Feeding experiments; Food conversion; Growth rate; Phosphorus; Pollution control; Vitamin D; Dietary phosphorous; Rainbow trout; Oncorhynchus mykiss
Collections
  • AQD [1108]

© SEAFDEC 2021
Contact Us | Send Feedback
 

 

Browse

All of SIRCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

My Account

Login

Statistics

View Usage Statistics
Related Links
SEAFDEC/TD IRSEAFDEC/AQD IRSEAFDEC/MFRDMD IRSEAFDEC/IFRDMD IR

© SEAFDEC 2021
Contact Us | Send Feedback