The complaints made against marine finfish farming include the alleged effects of sea lice from salmon farms on sea trout. This is an issue that has been hotly contested for many years, with the aquaculture industry and wild fishery interests taking fundamentally different positions as to the effects sea lice from salmon farms have had on sea trout numbers. While wild fishery interests have ascribed the decline in sea trout numbers primarily to infestation by sea lice from fish farms, the aquaculture industry has contended that no causal linkage has been demonstrated and that the sea trout problem is multifactorial in nature.