Acoustic measurement of trout distributions in Spada Lake, Washington, using stationary transducers

T. B. Stables, G. L. Thomas

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Diel patterns in the spatial distribution of rainbow Oncorhynchus mykiss and cutthroat trout O. clarki were studied with stationary acoustic transducers, gillnets, and setlines in Spada Lake during summer thermal stratification. Four diel periods (dawn, 03.00-07.00 hr; day, 07.00-19.00 hr; dusk, 19.00-23.00 hr; night, 23.00-03.00 hr) and two horizontal strata (nearshore, bottom depth <8 m; offshore, bottom depth >8 m) were identified from fish distribution patterns. During the day, trout were almost exclusively offshore and their densities were highest at intermediate depths of the water column (4-16 m). From dusk to dawn, trout were in intermediate and shallow depths (0-4 m) of the offshore and nearshore strata. Mean depth of capture was significantly deeper for cutthroat (9 m) than for rainbow trout (3 m). Both species primarily inhabited the epilimnion and metalimnion where temperature ranged from 22.5 to 11.0°C and were nearly absent from deeper, cooler waters. Dissolved oxygen levels ranging from 3.9-8.6 mg/l did not seem to influence trout distributions. -Authors

Original languageEnglish (US)
Pages (from-to)191-203
Number of pages13
JournalJournal of Fish Biology
Issue number2
StatePublished - Feb 1992
Externally publishedYes


  • Oncorhynchus clarki
  • Oncorhynchus mykiss
  • acoustics
  • hydroacoustics
  • spatial distribution

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science


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