Preference of redear sunfish on zebra mussels and rams-horn snails

Journal of Freshwater Ecology
By:  and 

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Abstract

We tested prey preferences of adult (200- to 222-mm long) redear sunfish (Lepomis microlophus) on two size classes of zebra mussels (Dreissena polymorpha) and two-ridge rams-horns (Helisoma anceps) in experimental aquaria. We also tested physical limitations on consuming these mollusks and determined prey bioenergetic profitability. Redear sunfish strongly preferred rams-horns over zebra mussels, but they displayed no size preference for either prey. Ingestion was not physically limited since both prey species up to 15-mm long fit within the pharyngeal gapes of redear sunfish. Rams-horns were more bioenergetically profitable than zebra mussels and ingestion of rams-horn shell fragments was about three times less than zebra mussels. Rams-horns were somewhat more resistant to shell-crushing, but all size ranges of both prey species tested were crushable by redear sunfish. These studies suggested that the redear sunfish should not be considered a panacea for biological control of zebra mussels.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Preference of redear sunfish on zebra mussels and rams-horn snails
Series title Journal of Freshwater Ecology
DOI 10.1080/02705060.1995.9663416
Volume 10
Issue 1
Year Published 1995
Language English
Publisher Taylor & Francis
Contributing office(s) Great Lakes Science Center
Description 8 p.
First page 49
Last page 56
Online Only (Y/N) N
Additional Online Files (Y/N) N