thumbnail

Potential spawning habitat for lake trout on Julian's Reef, Lake Michigan

Journal of Great Lakes Research

By:
,

Links

  • The Publications Warehouse does not have links to digital versions of this publication at this time
  • Download citation as: RIS

Abstract

Julian's Reef is an historical spawning ground for lake trout (Salvelinus namaycush) in southwestern Lake Michigan. It is designated lake trout refuge and is the focus of lake trout restoration efforts in Illinois waters of the lake. We studied the reef to determine its potential as spawning habitat for stocked lake trout. We used side-scan sonar and a remotely operated vehicle equipped with a video camera to survey and map 156 ha of lake bed on the southeast portion of the reef, where an earlier study revealed the presence of loose-rock substrate potentially suitable for use by spawning lake trout. Our survey showed that the substrate on the reef that most closely resembled that described in the literature as suitable for spawning by stocked lake trout in the Great Lakes was rubble patches with interstitial depths greater than 20 cm. These rubble patches occupied about 2 ha of the 13-ha expanse of bedrock and rubble substrate near the reef crest in the surveyed area. We estimated that these rubble patches, if fully used by spawning lake trout, could accomodate egg deposition by at least 1,300-3,300 2.7-kg females.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Potential spawning habitat for lake trout on Julian's Reef, Lake Michigan
Series title:
Journal of Great Lakes Research
Volume
22
Issue:
1
Year Published:
1996
Language:
English
Contributing office(s):
Great Lakes Science Center
Description:
p. 83-88
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Great Lakes Research
First page:
83
Last page:
88
Number of Pages:
5