Salvelinus fontinalis hybrids include: S. fontinalis x S. namaycush: commonly known as splake (United Kingdom), splejk (Sweden);
S. fontinalis x S. alpinusommonly known as sparctic charr, sparctic trout (United Kingdom), Elsässer Saibling (Germany), Brødding (Denmark), Bröding (Sweden);
S. fontinalis x Salmo trutta commonly known as tiger trout, tigerfish (United Kingdom) Tigerfisch (Germany), Tigerfisk, tigerforell, tigeröring (Sweden) (Jansson, 2008).

Finally, many introductions of Salvelinus fontinalis were to previously fishless lakes which resulted in a dramatic reduction of many threatened, even endangered amphibian populations. Specific negative interactions by introduced brook trout have been imposed on the Chiricahua leopard frog (see Rana chiricahuensis in IUCN Red List of Threatened Species), boreal chorus frog (Pseudacris maculata), Colombia spotted frog (Rana luteiventris), wood frog (Rana sylvatica), tailed frog (Ascaphus truel), cascade frog (see Rana cascadae in IUCN Red List of Threatened Species), Pacific tree frog (Pseudacris regilla), Iberian frog (see Rana iberica in IUCN Red List of Threatened Species), tiger salamander (Ambystoma tigrinum), northwestern salamander (Ambystoma gracile), long-toed salamander (Ambystoma macrodactylum), boreal toad (see Bufo boreas in IUCN Red List of Threatened Species), palmate newt (Triturus helveticus), alpine newt (Triturus alpestris), marbled newt (Triturus marmoratus), and endangered species mountain yellow-legged frog (see Rana muscosa in IUCN Red List of Threatened Species) (Bosch et al. 2006; Bradford, 1998; Dunham, 2004; FishBase, 2001; Leary et al. 1993; Levin et al. 2002; Nakano et al. 1998; Reiman et al. 2006; Spens et al. 2007; Fuller, 2006; Jansson, 2008).

Copp et al, (2005) Risk identification and assessment of non-native freshwater fishes presents a conceptual risk assessment approach for freshwater fish species that addresses the first two elements (hazard identification, hazard assessment) of the UK environmental risk strategy. The paper presents a few worked examples of assessments on species to facilitate discussion. The electronic Decision-support tools- Invasive-species identification tool kits that includes a freshwater and marine fish invasives scoring kit are made available on the Cefas (Centre for Environment, Fisheries & Aquaculture Science) page for free download (subject to Crown Copyright (2007-2008)).

Physical: Several methods of physical removal of Salvelinus fontinalis have been utilized to allow for recovery of affected native species. These methods result in little if any effects on non-target organisms or detriment to surrounding environments. They are very effective in small areas but prove somewhat inefficient on a grander scale. Methods include the use of depletion electrofishing, capture with monofilament gill nets, and underwater angling.

Electrofishing and removal has been employed in several instances and has replaced the use of ichthyocides in many locations. Treatment methods include backpack and boat mounted shockers. In the Colorado River Basin, USA, brook trout were removed to successfully promote severely diminished Colorado River Basin cutthroat trout (Oncorhynchus clarki pleuriticus) populations using three pass depletion-removal electrofishing. Similarly, brook trout were eradicated from several creeks in Montana, USA to study the effects on failing, native westslope cutthroat trout (Oncorhynchus clarki lewisii). Another electofishing removal study was successfully conducted in Colorado, USA to investigate the effects of brook trout on native cutthroat trout (Oncorhynchus clarki) (Peterson et al. 2004; Thompson & Rahel 1996; Shepard, 2004).

The removal of S. fontinalis using monofilament gill nets was successful recovering endangered mountain yellow-legged frog (Rana muscosa) in the 60 Lakes Basin of Kings Canyon National Park in the Sierra Nevada, USA. Another study in the Sierra Nevada in Maul Lake found the use of gill nets to be effective and more cost efficient than the use of piscicide Rotenone in small lakes. In Mount Rainer Park, Washington, USA, nets were employed to remove brook trout from a mountain lake, which yielded a successful recovery of northwestern salamander (Ambystoma gracile). Finally, the same method was used in Bighorn Lake, Alberta, Canada to study eradication of non-native fish to study their effects cascading trophic interactions. Conclusions found eradication to provide a partial to full recovery of lake flora and fauna (Vrendenburg, 2004; Knapp & Matthews, 1998; Hoffman et al. 2004; Parker & Schindler, 2006).

Underwater angling using live invertebrate bait is a primitive yet effective method used in Elk Creek, Montana, USA to eradicate S. fontinalis and successfully recover threatened native bull trout (Salvelinus confluentus) and cutthroat trout (Oncorhynchus clarki) (Nakano et al. 1998).

Chemical: The use of toxic piscicides for the removal S. fontinalis, and fish in general, has dramatically declined as a result of improved understanding of its ecological effects and mortality of nontarget organisms. The use of piscicides is effective, especially in large areas were physical removal methods prove inefficient. However, most eradications are done to aid threatened native organisms which is difficult when considering their probable harm as a result of piscicide use. Treatment methods include drip stations and backpack and helicopter mounted sprayers. Successful eradication of brook trout using antimycin was performed in Yellowstone Lake tributary Arinca Creek in Wyoming, USA to allow for cutthroat trout recovery. Rotenone is another effective piscicide in eradicating brook trout (Gresswell, 1991; Knapp & Matthews, 1998).