You dock at the oil rig off Rosslit Bay, climb the metal stairs to the top floor, and turn right into the Laboratory. A scientist named Dr. Crookspine is hunched over a bench, and instead of asking for something rare or expensive, he wants junk. Two Silver Rusty Bolts, five Scrap Metal, one Lunar String. Bring him the trash he asked for and he hands over the Scavenger Rod.
It sounds almost too easy, and for once, it is. The Scavenger Rod is the cheapest and least painful of the three new Astral Observatory rods, and its passive makes it one of the better mid-game money rods you can grab in under an hour.
Why the Scavenger Rod Is the Best Value in the Astral Update
The Astral Observatory update dropped around August 22, 2026, with three new rods. Most of them want hard fights or expensive materials. The Scavenger Rod asks for none of that.
Here is the trade. You fish in three zones you already know, force a couple of mutations, and walk away with a rod that has 100% Luck, 75% Lure Speed, and a 3x chance for Rare Finds. That passive is the whole point. Rare Finds are where mid-game money comes from, and this rod triples how often you roll them.
Compare that to the other two new rods. The Meteoric Rod and Rod of Singularity both want more from you. The Scavenger Rod is the one you can realistically finish the same session you start it.
Where to Find Dr. Crookspine
Dr. Crookspine sits at the oil rig off the coast of Rosslit Bay. Sail out, dock at the rig, and go to the top of the main building. Enter, then turn right. He is in the Laboratory room.
Talk to him and he gives you the three-part quest. You can turn in each part as you finish it or bring all three at once. The quest marker points at the rig, so you will not get lost on the way there.
The Three-Part Quest, Step by Step
The three items are not hard to catch. The hard part is remembering the mutation requirements, because two of the three items need a specific mutation on top of the base catch.
Part 1: 2 Silver Rusty Bolts
Fish in the Mine Shaft zone. Use the Titanium Rod with Garbage Bait. The Rusty Bolt is a low-rarity catch, so it shows up often.
The catch is the word “Silver.” The bolt must carry the Silver mutation. A plain Rusty Bolt does not count. To force Silver, equip Mutated Sharky bait or appraise with a Mutation Totem. If you have the Toxin Burst rod, its extra catches per cast make this step noticeably faster.
Part 2: 5 Scrap Metal
Fish in The Depths during daytime. Any rod works, and you want Garbage Bait again. Scrap Metal is low rarity and appears constantly. There is no mutation requirement here, so this part is just a time sink. Fish until you have five and move on.
Part 3: 1 Lunar String
Fish in Desolate Deep’s Desolate Pocket. This one has no bait or weather preference, so don’t waste time chasing a specific condition. The requirement is the Lunar mutation.
The Moonlight Rod applies Lunar to every catch, which turns this part into a single cast. If you don’t have it, use Mutated Sharky bait or a Mutation Totem to force the mutation. Catch one string, confirm the Lunar roll, and you are done.
Return all three sets to Dr. Crookspine and he gives you the Scavenger Rod.
Scavenger Rod Stats and the Rare-Finds Passive
| Stat | Value |
|---|---|
| Lure Speed | 75% |
| Luck | 100% |
| Resilience | 20% |
| Max Kg | 75,000 |
| Scavenged mutation | 40% chance, 3x multiplier |
| Passive | 3x chance for Rare Finds |
The headline here is the passive. A 3x chance for Rare Finds means this rod pays for itself fast if you use it on the right spots. The 40% Scavenged mutation adds a 3x sell multiplier on top of that, so a good catch can come out worth far more than its base price.
Resilience of 20% is the weak point. You will not hold huge fish as easily as you would with a tank rod, but for mid-game money fishing that is rarely the bottleneck. Lure Speed 75% and Luck 100% mean you catch fast and roll good rarities often.
What to Prepare Before You Start
The quest is quick once you stop re-rolling, and almost all of that speed comes from what you bring before you sail anywhere.
Pack, in order: Mutated Sharky bait (or a spare Mutation Totem) so the Silver and Lunar rolls are forced instead of gambled; the Titanium Rod for the Mine Shaft, because its lure profile is what the bolt drop is tuned around; and the Moonlight Rod if you own it, which makes the Lunar String part a single cast. That is the whole shopping list. Everything else in your loadout is optional.
Realistic times: Scrap Metal takes about two to five minutes in The Depths, the Lunar String is one cast with the Moonlight Rod or five to ten minutes forcing Lunar without it, and the bolts are the longest part — plan ten to twenty minutes in the Mine Shaft with a totem or Mutated Sharky, longer if you fish them raw. Do the bolts last, keep your two best totems for them, and you are usually done inside an hour.
What Can Go Wrong (and How to Recover)
Error: fishing the wrong zone for Rusty Bolts. The quest text says “bolts,” so players fish the rig or Rosslit Bay itself. You catch nothing but common fish for half an hour. Cause: Rusty Bolts spawn in the Mine Shaft, not the rig. Recovery: Go to the Mine Shaft zone, switch to the Titanium Rod with Garbage Bait, and watch them start dropping.
Error: forgetting the mutation and appraising away the item. You catch a Rusty Bolt, get excited, and appraise or sell it. You handed away the very thing you needed. Cause: the quest needs Silver on the bolt and Lunar on the string, not just the base item. Recovery: force the mutation before you fish. Mutated Sharky or a Mutation Totem means the catch comes out correct the first time, so there is nothing to accidentally appraise away.
Error: using high-luck bait where it hurts. Players stack luck bait to speed up Scrap Metal and Rusty Bolt drops. Cause: these are low-rarity items, so more luck pulls in rarer fish that crowd out what you actually want. Garbage Bait is the correct choice for both. Recovery: swap to Garbage Bait, keep the Titanium Rod for bolts, and the items start showing up in fewer casts.
Which Rod, Bait, and Mutation Method Per Item
| Item | Where | Rod | Bait | Mutation trick |
|---|---|---|---|---|
| 2 Silver Rusty Bolts | Mine Shaft | Titanium Rod | Garbage Bait | Force Silver with Mutated Sharky or Mutation Totem |
| 5 Scrap Metal | The Depths (daytime) | Any rod | Garbage Bait | None needed |
| 1 Lunar String | Desolate Pocket | Moonlight Rod | Any (no preference) | Lunar is automatic with Moonlight Rod |
| If you want… | Then use… |
|---|---|
| Bolts without gambling | Titanium Rod + Mutated Sharky or Mutation Totem in the Mine Shaft |
| Scrap Metal fast | Any rod + Garbage Bait in The Depths during daytime |
| Lunar String in one cast | Moonlight Rod in Desolate Pocket |
| Faster bolt farming | Toxin Burst rod for extra catches |
The Counter-Intuitive Tip: Stop Re-Fishing, Start Forcing
Most players treat the mutation requirement as a grind. They fish Rusty Bolts over and over, appraising each one, hoping the Silver roll eventually lands. That is the slow, frustrating way to do this quest.
The fast way is to force the mutation up front. A Mutation Totem at the appraiser, or Mutated Sharky bait, makes the next catch come out with the mutation already applied. For Lunar String, the Moonlight Rod makes Lunar automatic on every cast. One totem or one bait swap beats an hour of re-fishing a low-rarity item and hoping.
The same logic applies to bait. Players assume more luck is always better, but for low-rarity quest items, Garbage Bait is the correct call because it keeps the pool clean. Want the full breakdown of how bait affects your rolls? See the rod and bait combination guide and the bait economy guide.
What’s Still Unconfirmed
The exact patch date is approximate (around August 22, 2026), and the “easiest of the three” label is community consensus rather than an official rating. The Scavenged mutation’s 40% trigger rate and 3x multiplier come from the rod description, but how that interacts with the Rare-Finds passive in specific spots is still being tested by players. Treat the stat table as accurate to the rod card, not as a deep-dive into hidden multipliers.
FAQ
How do I get the Scavenger Rod in Fisch?
Sail to the oil rig off Rosslit Bay and find Dr. Crookspine in the Laboratory at the top of the building. He hands you a three-part quest. You need 2 Silver Rusty Bolts from the Mine Shaft, 5 Scrap Metal from The Depths during daytime, and 1 Lunar String from Desolate Deep’s Desolate Pocket. The bolts must carry the Silver mutation and the string must carry the Lunar mutation. Turn in all three sets and Crookspine gives you the Scavenger Rod. It is the cheapest of the three new Astral Observatory rods and needs no hard boss fight.
Where is Dr. Crookspine?
Dr. Crookspine stands in the Laboratory at the oil rig off the coast of Rosslit Bay. Sail out to the rig, enter the main building at the top, and turn right once you are inside. He waits in the lab room there. Talk to him and he lists the three items he wants: 2 Silver Rusty Bolts, 5 Scrap Metal, and 1 Lunar String. You can hand in each part as you finish it, or bring everything at once. The quest marker points at the rig, so it is hard to miss.
How do I get a Silver Rusty Bolt?
Fish in the Mine Shaft zone with the Titanium Rod and Garbage Bait. A Rusty Bolt is low rarity and appears often, but you specifically need the Silver mutation on top of it. The safe route is to equip Mutated Sharky bait or drop a Mutation Totem at the appraiser to force Silver, then catch your bolts. If you own the Toxin Burst rod, its extra catches per cast speed this step up. You need two bolts, so plan for a couple of totems unless you are fine leaning on luck.
Where do I catch Lunar String?
Lunar String comes from Desolate Deep’s Desolate Pocket area. It has no bait or weather preference, so don’t sit around waiting for a specific condition. The catch is the mutation: it must roll Lunar. The Moonlight Rod applies Lunar to every single catch, which removes the guessing entirely. If you don’t own the Moonlight Rod, use Mutated Sharky bait or a Mutation Totem to force the mutation instead. Catch one string, lock in the Lunar roll, and move on to the next part.
Is the Scavenger Rod better than the Titanium Rod?
For most goals, yes. The Scavenger Rod has 75% Lure Speed, 100% Luck, 20% Resilience, and 75,000 Max Kg, plus a 3x chance for Rare Finds passive. The Titanium Rod is the tool you use to grind this quest, not a fair comparison for your final loadout. The Scavenger Rod’s Rare-Finds passive makes it a stronger mid-game money rod, while the Titanium Rod’s real niche is high resilience. If you want faster catches and better rare-fish odds, the Scavenger Rod wins.