Actually, Furnace Lake is stocked with pure bred muskies, not tiger muskies. NJ has had poor results with tigers and only a few lakes are stocked with them. Hackettstown is fortunately a VHS free hatchery so they can export fish to other states. Most tiger muskies raised at Hackettstown are raised for trade. For example, we trade tiger muskies and northern pike to Massachusetts for landlocked salmon.
FYI, here is the latest Hackettstown stocking report for 2015:
http://www.njfishandwildlife.com/pdf/fwfisheries/htown_stockings15.pdf