Reducing elasmobranch bycatch: laboratory investigation of rare earth metal and magnetic deterrents with spiny dogfish and Pacific halibut.

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Citation: Stoner, A. W., and S.M. Kaimmer., 2008. Reducing elasmobranch bycatch: laboratory investigation of rare earth metal and magnetic deterrents with spiny dogfish and Pacific halibut.. Fisheries Research, 92, ps 162-168.
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Summary:

Two rare earth metals (neodymium-iron-boride magnets and cerium mischmetal) attached to baited hooks were tested in a laboratory study against inert metal controls to determine the effects of spiny dogfish and Pacific halibut. Spiny dogfish attacked and consumed fewer baits with mischmetal than for the control or magnets. Magnets did not deter dogfish from eating baits, and Pacific halibut showed no reaction to either rare earth metal.
Field Studies:
Location Fishing gear Reduction technique Bycatch species Effect on bycatch species Catch Effect on target catch Type
Laboratory study Hooks-and-Lines Rare earth magnets Elasmobranchs Mischmetal reduced the likelihood of an attack or consumption of bait by spiny dogfish. Pacific halibut Did not affect halibut In the wild