Nocturne should focus on full clearing efficiently to hit level 6 on schedule and unlock strong map pressure with (R).
Prioritize using (R) to punish Fiddlesticks's low early-game pressure by targeting overextended lanes and forcing objectives.
This is a mid-paced snowball vs scale jungle matchup where Nocturne must leverage early picks to deny Fiddlesticks's scaling and objective control.
Jungle Plan
Use efficient full clears to reach level 6 quickly, then use (R) for cross-map picks on overextended lanes before starting dragon or Rift Herald.
Fight for river control and Scuttle when your lanes have priority to deny Fiddlesticks vision and invade opportunities.
Track Fiddlesticks's pathing to counter-jungle camps he leaves vulnerable after his fast clears and force him off objectives post-6 with your dueling and pick threat.
Danger windows
Avoid isolated river fights before level 6 where Fiddlesticks can out-clear and punish with fear or silence.
Beware multi-lane collapses around Scuttle or objectives where Fiddlesticks's teamfight and vision denial amplify risk.
Do not contest objectives without lane priority and vision control to prevent losing smite fights or forced fights under fog of war.
Early game
Start with a full clear path toward level 6, avoiding early river fights where Fiddlesticks can set ambushes.
Contest first Scuttle only if nearby lanes have priority to reduce risk of multi-lane collapse.
Avoid early invades against Fiddlesticks before level 6 since he clears very fast and can reset vision control.
Power spikes
Hit level 6 full clear to unlock (R) and pressure side lanes for picks and objective setups.
Use (W) spell shield actively to block Fiddlesticks's (Q) fear and reduce his early dueling threat.
Respect Fiddlesticks's level 6 when he gains high gank threat with (R) channel ambush; avoid isolated river fights during this window.
Win conditions
Convert level 6 picks with (R) into dragon or Rift Herald control by forcing Fiddlesticks off vision and objective entrances.
Use superior dueling with (W) spell shield to win skirmishes and deny Fiddlesticks safe farming and scaling.
Maintain tempo by tracking Fiddlesticks's pathing to counter-jungle and pressure lanes before he can set up ambushes with his ultimate.
Tip: For Nocturne vs Fiddlesticks, read overview, trading pattern, and danger windows first for a fast Jungle lane check.