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The influence of environmental manipulations on inter– and intra–individual variation in food acquisition and growth performance of Arctic charr, Salvelinus alpinus (1994)

Jobling, M. ; Baardvik, B. M.

Oxford, UK : Blackwell Publishing Ltd

Journal of fish biology 44 (1994), S. 0

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ISSN: 1095-8649

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Repeated measurements of food intake made on juvenile Arctic charr, Salvelinus alpinus, held under different rearing conditions enabled examination of the effects of environmental manipulations on both intra– and inter–individual variations in food intake to be made. This permitted the assessment of the influences of differential food acquisition on individual growth rates and biomass gain. When charr were held in isolation individual fish showed relatively little day–to–day variability in food intake and inter–individual differences in intake were small (‘base–fine’ values). All fish exhibited positive rates of growth and the overall range was narrow. Nevertheless, there was a highly significant positive correlation between food intake and growth, indicating that those individuals that consumed the greatest quantities of food were also those that had the highest rates of weight gain. The rearing of charr in groups led to increases in both intra– and inter–individual variations in food intake to levels considerably above ‘base–line’. This increased variability in food intake was reflected in rates of weight gain being more variable amongst the charr reared in groups, with fish that lost weight often being recorded. Manipulation of the rearing environment had marked influences upon intra–individual variability in food intake, inter–individual differences in food acquisition and rates of weight gain. High stocking densities and exposure of the fish to moderate water currents were most effective in reducing levels of variability to approach those observed under ‘base–line’ conditions.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1095-8649.1994.tb01277.x

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The effects of prolonged exercise training on growth performance and production parameters in fish (1993)

Jobling, M. ; Baardvik, B. M. ; Christiansen, J. S. ; [et al.]

Springer

Aquaculture international 1 (1993), S. 95-111

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ISSN: 1573-143X

Keywords: Exercise training ; Growth performance ; Feeding behaviour ; Aggressive interactions ; Salmonids

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract When juvenile salmonids are reared in water flowing with currents equivalent to swimming speeds of about 0.75–1.5 BL s−1, the fish tend to grow faster and make more efficient use of the food provided than do conspecifics held in standing water. There may be a more even distribution of food within a group of exercised fish leading to uniformity of growth rates and a reduced size range of the fish at harvest. In addition, frequencies of aggressive interactions may be lower in exercised fish than in those reared in standing water, leading to fewer exercised fish having fin damage. Thus, several benefits may be expected to accrue from growing salmonids in flowing water. The ‘training’ of salmonids by exposing them to moderate water currents for prolonged periods leads to improvements in physiological performance, so rearing such fish in flowing, rather than standing, water may be particularly beneficial when they are destined for release in connection with restocking or ‘ranching’ programmes.