THE COMBINED EFFECTS OF STOCKING DENSITY AND SUSTAINED EXERCISE ON THE BEHAVIOR, FOOD-INTAKE, AND GROWTH OF JUVENILE ARCTIC CHARR (SALVELINUS-ALPINUS L)

Citation
Js. Christiansen et al., THE COMBINED EFFECTS OF STOCKING DENSITY AND SUSTAINED EXERCISE ON THE BEHAVIOR, FOOD-INTAKE, AND GROWTH OF JUVENILE ARCTIC CHARR (SALVELINUS-ALPINUS L), Canadian journal of zoology, 70(1), 1992, pp. 115-122
Citations number
44
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Zoology
Journal title
ISSN journal
0008-4301
Volume
70
Issue
1
Year of publication
1992
Pages
115 - 122
Database
ISI
SICI code
0008-4301(1992)70:1<115:TCEOSD>2.0.ZU;2-T
Abstract
The combined effects of stocking density and sustained exercise on the behaviour and food intake - growth relationship of individually tagge d juvenile Arctic charr (Salvelinus alpinus L.) were examined. Both fo od intake and growth (weight gain) were significantly lower in fish st ocked at the high density (initial biomass approximately 47 kg . m-3) than in fish stocked at the low density (initial biomass approximately 23 kg . m-3). When the charr stocked at low densities were subjected to sustained exercise, they showed higher growth rates than fish reare d in standing water (control). In contrast, exercise did not give rise to improved growth performance in fish stocked at high densities. The growth - food intake ratio (food utilization) differed markedly betwe en control and exercised fish. Irrespective of stocking density, food utilization was significantly better in exercising fish than in fish r eared in standing water. The differences in food intake, growth, and f ood utilization are discussed in relation to the changes in behaviour and social interactions induced by forcing the fish to swim against a water current.