This item is not included in any spawn asset, but it doesn't necessarily mean that it doesn't spawn naturally on any of the maps.
Fishingrod.dat
GUID 50d4e1bd687943cf98aca317badd5f3c
Type Fisher
Rarity Rare
Useable Fisher
ID 43101
Size_X 3
Size_Y 1
Size_Z 0.24
Backward
Reward_ID 43101
Blueprints 1
Blueprint_0_Type Tool
Blueprint_0_Supplies 4
Blueprint_0_Supply_0_ID 285
Blueprint_0_Supply_0_Amount 4
Blueprint_0_Supply_1_ID 69
Blueprint_0_Supply_1_Amount 1
Blueprint_0_Supply_2_ID 64
Blueprint_0_Supply_2_Amount 1
Blueprint_0_Supply_3_ID 71
Blueprint_0_Supply_3_Amount 1
Blueprint_0_Tool 76
Blueprint_0_Level 2
Blueprint_0_Skill Craft
Blueprint_0_Build 27
Use_Auto_Icon_Measurements false
Procedurally_Animate_Inertia false