الفهرس 
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Abstract
This study was carried out at an indoor installation of the Aquaculture Laboratory, School of Environment and Natural Resources (SENR), The Ohio State University (OSU), Columbus, Ohio, USA. To study the effects of some dietary factors on the performances of farmed fish. In the first feeding trial, diets incorporating different levels of corn gluten meal replacement by using biofuel algae or Spirulina protein at 0, 25,50, 75, and 100% were evaluated for larval/juvenile stage of Nile tilapia (Oreochromis niloticus). Fish averaging 0.02 g were divided into groups of 50. There were 3 replicates per every dietary treatment that were fed one of six diets for 11 weeks. Corn gluten protein was replaced with algae on the protein basis. All diets were supplemented with 1.5% lysine and 0.5% methionine. The experimental diets were formulated to contain 34.9 ± 0.1% protein and 12.2 ± 0.1 % lipid in the form of fish oil and soybean lecithin (phospholipids source). The second research involved testing the replacement of corn gluten protein concentrate in the diet of 1.5 g Nile tilapia with biofuel algae-based or algae supplemented with phosphorus diets. Experimental diets were formulated to replace 50% of the gluten meal protein in the control diet with biofuel algae protein (Alga50) or Spirulina (Spirulina50) protein. In addition, dicalcium phosphate (P) was added to the Alga50 at a concentration of 3.8% or 7.74% to mitigate aluminum (Al) toxicity and designated as Alga50+P, and Alga50+PP, respectively.In the third feeding trial, the effects of algae protein, singly or in combination with pea protein concentrate (PC) and/or phosphorus (P) supplementation, as a substitute for fish meal in diets for rainbow trout were investigated. A 7-week feeding trial was carried out using triplicate groups of rainbow trout with 0.22± 0.06 g initial weight. Dietary fish meal protein was replaced at 16% protein basis by biofuel algae (A16), Spirulina (S16) or A16 with PC (APC). Eight experimental diets were formulated and marked as FM (control), A16, A16+P, A16+PP, APC, APC+P, APC+PP, and S16