The measurement of specific dynamic action in fishes

Specific dynamic action (SDA) is the postprandial increase in oxygen uptake. Whereas it is easy to measure in fishes that remain calm and motionless during the entire digestion period, spontaneous locomotor activity is a frequent problem that leads to overestimation of SDA amplitude and magnitude (a...

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Bibliographic Details
Published in:Journal of fish biology 2016-01, Vol.88 (1), p.152-172
Main Authors: Chabot, D., Koenker, R., Farrell, A. P.
Format: Article
Language:English
Subjects:
Animals
Basal Metabolism
Diet - veterinary
Digestion
Energy Metabolism
feeding
Fish
Gadus morhua - metabolism
heat increment
Motor Activity
non-parametric quantile regression
Oxygen Consumption
postprandial metabolic rate
Postprandial Period
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Summary:Specific dynamic action (SDA) is the postprandial increase in oxygen uptake. Whereas it is easy to measure in fishes that remain calm and motionless during the entire digestion period, spontaneous locomotor activity is a frequent problem that leads to overestimation of SDA amplitude and magnitude (area under the curve, bound by the standard metabolic rate, SMR). Few studies have attempted to remove the effect of fish activity on SDA. A new method, non‐parametric quantile regression, is described to estimate SDA even when pronounced circadian activity cycles are present. Data from juvenile Atlantic cod Gadus morhua are used to demonstrate its use and advantages compared with traditional techniques. Software (scripts in the R language) is provided to facilitate its use.
ISSN:0022-1112
1095-8649
DOI:10.1111/jfb.12836