Accession Number : ADA322712

Title :   Selection of Prey by Walleyes in the Ohio Waters of the Central Basin of Lake Erie, 1985-1987.

Descriptive Note : Technical rept.,

Corporate Author : FISH AND WILDLIFE SERVICE SANDUSKY OH

Personal Author(s) : Wolfert, David R. ; Bur, Michael T.

PDF Url : ADA322712

Report Date : 1992

Pagination or Media Count : 20

Abstract : Walleyes (Stizostedion vitreum vitreum) were collected at five locations in the central basin of Lake Erie in 1985-87. The contents of the fishes' stomachs were examined to identify the species of prey. The seasonal availability of potential prey was determined from sampling with trawl tows. Food electivity indexes for young-of-the-year (YOY) and older walleyes were calculated. Electivity indexes changed monthly in YOY walleyes that consumed mostly YOY gizzard shads (Dorosoma cepedianum) in July and fed moderately on gizzard shads, but more on smelts (Osmerus mordax), in August In September and October, YOY walleyes did not consume YOY white perch (Morone americana). During October they continued to eat YOY gizzard shads moderately but consumed mostly emerald shiners (Notropis atherinoides). Older walleyes were highly partial to YOY gizzard shads, emerald shiners, and smelts and consumed no YOY white perch. The numbers of YOY yellow perch (Perca flavescens) in stomachs were limited. Prey selection by walleyes in the central basin was species-specific irrespective of abundance of prey.

Descriptors :   *HABITATS, *FISHES, *STOMACH, WATER, OHIO, SEASONAL VARIATIONS, SAMPLING, FOOD, BASINS(GEOGRAPHIC), AQUATIC ANIMALS, BERYL, GEMS(MINERALS), YELLOW(COLOR), LAKE ERIE.

Subject Categories : Biology
      Biological Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE