Profiles of digestive enzymes of two competing planktivores, silver carp and gizzard shad, differ

Typically, studies in digestive physiology in fish focus on a few enzymes and provide insight into the specific processes of the enzyme in a targeted species. Comparative studies assessing a wide number of digestive enzymes on fishes that compete for food resources are lacking, especially in the con...

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Bibliographic Details
Published in:Ichthyological research 2018-04, Vol.65 (2), p.245-251
Main Authors: Amberg, Jon J., Jensen, Nathan R., Erickson, Richard A., Sauey, Blake, Jackson, Craig
Format: Article
Language:English
Subjects:
Acid phosphatase
Alkaline phosphatase
Animal Systematics/Taxonomy/Biogeography
Biomedical and Life Sciences
Comparative analysis
Comparative studies
Digestive enzymes
Dorosoma cepedianum
Ecology
Enzymes
Fish
Food resources
Freshwater & Marine Ecology
Freshwater fishes
Glucosaminidase
Hypophthalmichthys molitrix
Introduced species
Life Sciences
Phosphatase
Phosphohydrolase
Plankton feeders
Profiles
Resources
Rivers
Valine
Zoology
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Summary:Typically, studies in digestive physiology in fish focus on a few enzymes and provide insight into the specific processes of the enzyme in a targeted species. Comparative studies assessing a wide number of digestive enzymes on fishes that compete for food resources are lacking, especially in the context of an introduced species. It is generally thought that the invasive silver carp (SVC; Hypophthalmichthys molitrix ) directly compete for food resources with the native gizzard shad (GZS; Dorosoma cepedianum ) in waters where they coexist. We compared 19 digestive enzymes between SVC and GZS throughout a year and in two rivers in the Midwestern United States: Illinois River and Wabash River. All digestive enzymes analyzed were detected in both SVC and GZS in both rivers. However, the profiles of the digestive enzymes varied by species. Alkaline phosphatase, valine arylamidase, acid phosphatase, naphthol-AS-BI-phosphohydrolase and N-acetyl-β-glucosaminidase were all much higher in SVC than in GZS. Differences between digestive enzyme profiles were also observed between rivers and months. This study demonstrates the utility of using an ecological approach to compare physiological features in fishes.
ISSN:1341-8998
1616-3915
DOI:10.1007/s10228-018-0615-x