Trout streams close March 18th :

[AndyS]

Anglers should be aware that most trout-stocked waters are closed to fishing during the 3 weeks leading up to opening day (March 18 - April 6 at 8 a.m.). During this time most trout-stocked waters are stocked with trout to provide anglers with great fishing opportunities on Opening Day, April 6.

During this pre-season period you might want to try fishing one of a handful of trout-stocked waters that remain open for fishing. Farrington Lake (Middlesex Co.), Lake Hopatcong (Morris/Sussex counties), Lake Shenandoah (Ocean Co.), Prospertown Lake (Ocean Co.), and Swartswood Lake (Sussex Co.) are open year round to fishing. Designated Trout Conservation Areas (Seasonal and Year Round) and Holdover Trout Lakes also remain open to fishing. (Note that fishing is not permitted on Seasonal Trout Conservation Areas from 12:01 a.m. to 8 a.m. on April 6, 2013). Trout caught in any of these waters during the pre-season period must be released immediately.

Those looking to fish during the pre-season period and keep their catch can cast a line in either of the state's two Trophy Trout Lakes, Merrill Creek and Round Valley Reservoirs.

http://www.state.nj.us/dep/fgw/trtinfo_spring.htm