Results of the 1986-87 California sea lion-steelhead trout predation control program at the Hiram M. Chittenden Locks. NWAFC Processed Report 88-30, Alaska Fisheries Science Center, NMFS, NOAA, Seattle, Washington.

Over time, noxious bait, consisting of dead steelhead containing lithium chloride, did not prevent California sea lion (Zalophus californianus) predation of Washington steelhead trout (Salmo gairdneri). Acoustic harassment devices worked only for a short time in reducing California sea lion depredation before sea lions began to habituate to sounds.
Field Studies:

Location	Fishing gear	Reduction technique	Bycatch species	Effect on bycatch species	Catch	Effect on target catch	Type
Washington State		Noxious bait	Pinnipeds	Did not prevent predation	Trout		In the wild
Washington State		Acoustic harassment devices	Pinnipeds	Worked temporarily, then habituation occurred	Scallop		In the wild