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Predation by odonate nymphs on larval razorback suckers (Xyrauchen texanus) under laboratory conditions

Southwestern Naturalist
By: , and 

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Abstract

High larval mortality has plagued efforts to raise razorback suckers (Xyrauchen texanus) in a Lake Mohave, Arizona-Nevada backwater. Observations indicate odonate nymph densities may be high enough to impact larval survival. In laboratory tests conducted in aquaria, damselfly (Coenagrionidae: Enallagma sp.) and dragonfly (Libellulidae: Tramea sp.) nymphs consumed 81% and 76% respectively of 11.8 ± 0.7 mm total length larval razorbacks in 7 days compared to 12% mortality in controls. Larger razorback larvae (14 to 15 mm TL) were less susceptible than smaller fish, showing 53% mortality versus 18% in controls. Extensive growth of sago pondweed (Potamogeton pectinatus) may exacerbate predation effects in the backwater, by allowing odonates access to more of the water column.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Predation by odonate nymphs on larval razorback suckers (Xyrauchen texanus) under laboratory conditions
Series title Southwestern Naturalist
Volume 39
Issue 4
Year Published 1994
Language English
Publisher Southwestern Association of Naturalists
Publisher location Dallas, TX
Description 4 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title The Southwestern Naturalist
First page 371
Last page 374
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