Evaluation of some factors affecting food conversion by age-0 arctic grayling reared in floating net-pens

• Main Author: McKinley, Timothy R.
• Format: Thesis
• Language: English
• Published: 1992
• Subjects: Arctic grayling; Arctic; Fairbanks; Thymallus arcticus; Alaska
• Online Access: http://hdl.handle.net/11122/14798

Thesis (M.S.) University of Alaska Fairbanks, 1992 Two experiments were repeated three times to evaluate the effects of feeding frequency, loading density, and food particle size on food conversion of age-0 Arctic grayling Thymallus arcticus reared in floating net-pens. Growth in length or weight could not be evaluated because of the short (11 - 12 days) feeding trials. When fed to satiation, the optimal interval between feedings was 3 hours. The highest initial loading density used (5.6 kg/m3) consistently produced the best food conversions (1.10 - 1.51 g food/g weight gain). Food particles several sizes larger than those generally recommended were used with less waste and without adverse effects. Optimal food size for 60 - 73 mm Arctic grayling was 1.3 - 1.5 mm (2.1 - 2.5% fork length). Division of Sport Fish, Alaska Department of Fish and Game