NDLI: Digestive capacity and compensatory growth in Atlantic cod (Gadus morhua)

Content Provider	Springer Nature Link
Author	Bélanger, F. Blier, P.U. Dutil, J. D.
Copyright Year	2002
Abstract	The objective of this study was to examine whether digestive capacity correlates with growth rate in Atlantic cod (Gadus morhua). Ninety fish (1035±240 g; 478±36 mm) were assigned to one of three treatments: deprived of food for 5 weeks and then re-fed for 24 days, deprived for 10 weeks and then re-fed for 24 days, or fed for 24 days without deprivation (controls). Three times a week during feeding, the fish were provided with meals of capelin (Mallotus villosus) in excess. Within each treatment, ten fish were sacrificed before and twenty after the feeding period. The relative masses of the pyloric caeca, intestine, and white muscle were determined. Cytochrome c oxidase (CCO), citrate synthase (CS), and nucleoside diphosphate kinase (NDPK) activities were assayed in the pyloric caeca, intestine, and muscle as was trypsin activity in the pyloric caeca. During the re-feeding period, fish that had been deprived of food for 10 weeks showed compensatory growth, growing 1.9 times faster than the controls (0.94±0.26 versus 0.50±0.31% body mass ⋅ day−1). Fish that displayed compensatory growth had a lower relative white muscle mass than controls (66.5±4.1% vs. 69.6±7.4%) while the relative masses of the pyloric caeca (2.21±0.49% vs. 1.78±0.31%) and intestine (0.95±0.20% vs. 0.77±0.15%) were greater than the controls, suggesting that the sizes of these digestive tissues might correlate with compensatory growth capacity. Citrate synthase in the pyloric caeca was the only enzyme that showed higher activity during compensatory growth (8.57±0.94 U ⋅ g tissue−1 compared to 7.13±1.03 U ⋅ g tissue−1 in the control group). This suggests that aerobic catabolic capacity of pyloric caeca could be related to growth capacity during recovery, possibly via the energetic cost of digestive enzyme synthesis.
Starting Page	121
Ending Page	128
Page Count	8
File Format	PDF
ISSN	09201742
Journal	Fish Physiology and Biochemistry
Volume Number	26
Issue Number	2
e-ISSN	15735168
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2002-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Animal Biochemistry Hydrobiology Zoology Animal Anatomy / Morphology / Histology Animal Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Biochemistry Aquatic Science

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