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In order to verify methods for minimzing waste output of phosphorus (P) into the water and preserve an adequate growth rate in rainbow trout, a succession of two feeding trials were performed employing three test diets that were formulated with a low proportion of fish meal(FM), low-P ingredients (defatted soybean 대두박, corn gluten meal 옥수수글루텐, feather meal 우모분 , and blood meal 혈분), and varying  levels of monocalcium phosphate (MCP) as a P supplement ( 0, 0.5 and 1% of diet which represent 0, 1 and 2 mg/g of available P , respectively).

 Total P concentrations achieved were 6.2, 8.7 and 9.6 mg/g respectively.

A control diet was formulated with FM as the main protein source and without MCP( total P content was 17.0 mg/g ).

Diets were fed until apparent satiation to duplicate groups of 50(1.5g) and 15 fish (147.8g) during 24and 14 weeks, respectively.

In both cases, the lowest growth was observed in fish fed the basal diet without MCP.

The thest diet supplemented with 0.5% MCP provided growth and feed performance complarable to that obtained in fish fed the control diet.

These results suggest that diets formulated with low-P ingredients should be supplemented with an adequate amount of P in order to meet the fish requirements and reduced diet-related P loading