Abstract
Recombinant eel GH and yeast containing chinook salmon growth hormone (reGH and rcsGH) were incorporated into gelatin and sodium alginate (reGH-GS and rcsGH-GS) or polymer matrix (reGH-HP55) to protect the hormone from proteolytic cleavage in the stomach. The diets containing reGH-GS, rcsGH-GS, reGH-HP55 and free-reGH or uncoated-rcsGH were administered to red sea bream. Feeding of reGH-GS, reGH-HP55 and rcsGH-GS diets resulted in significant increases in body weight and fork length over those of controls. These results strongly suggest that gelatin and sodium alginate as well as polymer matrix protected the hormone from proteolytic enzymes in the gastrointestinal tract to allow the bioactive hormone to enter the circulation and eventually stimulate fish growth.
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