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Wednesday, January 27 • 2:00pm - 2:20pm
White Grub In Centrarchidae From The Ohio River Drainage

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AUTHORS: Evan Boone*, Eastern Illinois University; Les Frankland, Illinois Department of Natural Resources; Devon Keeney, Le Moyne College; Jeffrey Laursen, Eastern Illinois University; Robert Colombo; Eastern Illinois University

ABSTRACT: White grub Posthodiplostomum minimum centrarchi is a juvenile strigeoid trematode that has been documented in many centrarchid fishes. It infects centrarchid fish by cercariae penetrating the skin, so transmission should be more efficient in slow moving water, and most studies are done on lentic systems where sunfish predominate. In this study, eleven centrarchid fish species (spotted bass (n=75), largemouth bass (n=3), smallmouth bass (n=5), bluegill (n=23), green sunfish (n=13), longear sunfish (n=15), orangespotted sunfish (n=20), redear sunfish (n=5), warmouth (n=7), black crappie (n=8), and white crappie (n=1)) were collected from the Ohio River Drainage in 2014 and 2015. Visceral organs, including reproductive tracts, were removed and examined for the presence of metacercariae. Prevalence of white grub ranged from 0 in crappies to 100% in largemouth bass, redear sunfish, and warmouth. Prevalence in bluegill, a common host, was 82.6%. Mean intensity of white grub ranged from two in green sunfish to 409 in largemouth bass. White grub was found in 52% of below stock spotted bass (28cm). Intensity also increased with size in spotted bass but variation was high in stock size bass, which included multiple age classes. Increased parasitism in stock class corresponds with sexual maturation, and may reflect a life history event such as moving to spawn in slack water with higher transmission rates. P. minimum was thought to be a generalist parasite infecting centrarchidae, but recent studies have suggested cryptic species. Preliminary genetic evidence suggests that there may be two species of white grub in this system, one in the genus Micropterus and one in the genus Lepomis.

Wednesday January 27, 2016 2:00pm - 2:20pm EST

Attendees (3)