Once Human Hydronaut Fish

Once Human Hydronaut Fish: Introduction 

The Once Human Hydronaut Fish Guide begins with a deviant unlike any other—a goldfish with a brain and a backstory. Known as Deviation O-052, the Hydronaut Fish is a Territory Deviant found in the “Way of Winter” scenario. But don’t let the word “goldfish” fool you—this isn’t your average bubble-blowing pet. She’s an eloquent, intellectually sophisticated being fluent in multiple languages and capable of mathematical feats that would fry the average survivor’s brain. Her personality is shaped not just by her abilities but also by her loneliness, which led her to build a mechanical humanoid suit just so she could interact with others face-to-face.

Unlike the flashy Combat Deviants that help you tear through enemies, the Hydronaut Fish plays a quieter, more strategic role in your survival. As a Territory Deviant, she boosts productivity and automates water-related tasks back at your base. Think of her as a living bio-computer fused with a fish tank. Her primary skill is manipulating water molecules—an ability she attributes to something called a “Self-Organizing Multi-Phase Compiler System.” Whether that’s real science or just deviant-speak for “magic tech,” it doesn’t matter—what matters is it works, and it works well. She can gather seawater, catch fish, and even speed up water purification and acid production when assigned to the right stations. 

Feature	Details
Deviant Type	Territory Deviant (PvE only)
Origin	Deviation O-052 – Way of Winter scenario
Personality	Highly intelligent, multilingual, emotionally aware
Special Ability	Matter manipulation via “Compiler System”
Securement Requirements	Grade II suite, expert furnishings, intellectual stimulation

What really sets her apart—and what the Once Human Hydronaut Fish Guide emphasizes—is her rich lore and character design. She’s not just a set of numbers or buffs; she’s a one-of-a-kind entity with emotional depth. Her humanoid suit isn’t just functional—it’s symbolic of her desire for connection. This makes her one of the most human characters in Once Human, which is saying a lot considering she’s technically aquatic and highly anomalous. This narrative flavor elevates the experience of obtaining and housing her. You’re not just recruiting a helper—you’re making room for a high-IQ roommate with an affinity for conversation and a disdain for chaos. 

Of course, such brilliance comes with requirements. You’ll need to construct a Grade II autonomous securement suite to house her, with expert-level furnishings and perhaps even a library’s worth of books to keep her mood up. Visitors must schedule appointments—no barging in with a wrench and shouting orders. She’s strictly PvE, and that’s a good thing. She’d probably outthink any PvP opponent before they finished loading in. The Once Human Hydronaut Fish Guide celebrates her not only as a utility asset but also as a delightful example of worldbuilding done right: funny, touching, and mechanically sound. 

Once Human Hydronaut Fish: How to Obtain Hydronaut Fish 

To recruit the Hydronaut Fish, you’ve got two very different paths—one built on empathy, the other on firepower. The Once Human Hydronaut Fish Guide strongly recommends starting with the more immersive of the two: the “Deviation: Hydronaut Fish” questline. Begin your journey by speaking to Lowe, an NPC located in Whalebone in the Vena Fjord region. He’ll direct you to Petit Harbor, where a certain well-dressed goldfish is spending her days in solitude. Yes, she’s walking around in a humanoid exosuit, because emotional depth and engineering skills go hand in fin. Once you find her, you’ll quickly discover she isn’t just looking for a base to call home—she’s looking for companionship. 

The Once Human Hydronaut Fish won’t join you immediately. She requests that you catch her a fish to ease her isolation. This kicks off the game’s version of aquatic matchmaking. You’ll need to craft a Fishing Rod using 20 Logs and 10 Copper Bars at your Supplies Workbench. Then you’ll need bait—specifically Dough Bait, made from corn. If you’re playing in the Way of Winter and corn is scarce, you can always purchase Corn Seeds from the vendor Silla and grow them in Planter Boxes. It’s not exactly a speedrun, but it’s a memorable, heartfelt detour that adds real character to the gameplay.

Acquisition Method	Steps
Quest: “Deviation: Hydronaut Fish”	Start with Lowe in Whalebone → Catch fish → Build fish tank → Convince → Complete quest
Required Items	Fishing Rod (20 Logs, 10 Copper Bars), Bait (from Corn), Fish Tank
Alternate Method	Securement Silo EX1 boss drop (Onyx Tundra, Level 20 PvE area)

Once you’ve caught any type of fish, the next step is to build a Fish Tank back at your territory. The tank unlocks after the catch and symbolizes your effort to create a comforting environment for your future companion. Place the fish inside the tank and then return to Petit Harbor. Seeing that you’ve gone through the trouble of catching and housing a friend for her, the Hydronaut Fish agrees to join your territory. She isn’t won over by power, but by kindness—a rare trait in the apocalypse. Report back to Lowe to complete the quest and make it official.

Now, for those of you who prefer skipping dialogue in favor of loot drops, there’s another route. Head to the Onyx Tundra and dive into Securement Silo EX1, a Level 20 PvE dungeon. Defeating the boss here gives you a chance to obtain the Once Human Hydronaut Fish as a random drop. It’s not guaranteed, and it lacks the emotional flair of the questline, but it’s still valid. You’ll walk away with the same Deviant—just minus the touching backstory and fishy courtship. Either way, the Once Human Hydronaut Fish Guide ensures that both routes lead to the same brilliant result: a goldfish with brains, feelings, and better tech skills than most players. 

Once Human Hydronaut Fish: Hydronaut Fish Abilities and Skills 

The Hydronaut Fish is no ordinary companion, and the Once Human Hydronaut Fish Guide proudly showcases how she trades brute strength for logistical brilliance. This isn’t the kind of deviant you bring to a gunfight—she’s the one you thank when your base runs smoother than a hydroelectric plant. Her first notable skill is passive seawater gathering, which sounds small until you realize just how important water is in Once Human. Whether you’re making salt or processing fluids, she quietly does the heavy lifting, saving you trips and time that would otherwise be wasted on manual collection. 

She doesn’t stop at just water. The Once Human Hydronaut Fish also autonomously catches fish, which might seem whimsical at first, but it’s actually a key feature for sustainable food and crafting material production. Having a constant trickle of meat and aquatic resources without lifting a finger means less stress on your own supply chain. If you’ve ever found yourself in need of fish for a recipe or short on materials for specific potions, her contributions start to look more and more like a foundational part of your daily operations. This isn’t fluff—it’s functional automation with a goldfish’s charm. 

Ability	Effect
Gathers Seawater	Pulls in water from outside your territory
Catches Fish	Occasionally brings in fish for food resources
Production Boost	Increases efficiency of Water Filter and Brewing Barrel
Skill: Rapid Purification	Accelerates seawater processing, improves conversion, and may yield special catches

Her production-enhancing traits make her a powerhouse in the background. Assign her to a Water Filter or Brewing Barrel, and you’ll see immediate results in output speed and transformation efficiency. Need more purified water for your base? Want to crank out acid faster for crafting? She’s your go-to. This is especially crucial in mid- to late-game, where territory efficiency begins to matter just as much as raw combat power. The Once Human Hydronaut Fish Guide doesn’t just praise her uniqueness—it emphasizes how vital she becomes when you’re running a well-optimized settlement. 

At the core of her utility is her Deviation Skill: Rapid Purification. When activated, this ability draws seawater from outside your territory, creating a burst of production that can yield bonus catches and materials. It’s like flipping the switch on an industrial-grade water processor. While other deviants may bring flashier combat effects, none quite compare to the sheer sustainability boost she provides. The Once Human Hydronaut Fish Guide makes one thing crystal clear—if you’re serious about base building and efficient resource management, the Hydronaut Fish isn’t optional; she’s essential. 

Once Human Hydronaut Fish: Increasing Hydronaut Fish Mood and Power 

Like all brilliant minds, the Hydronaut Fish performs best in an environment that nurtures her emotional and intellectual needs. That’s not a poetic exaggeration—it’s a gameplay mechanic. In the Once Human Hydronaut Fish Guide, this section focuses on how to maximize both her Mood and Deviant Power, turning her from a quirky goldfish in a suit into a productivity powerhouse. These aren’t just cosmetic tweaks—they directly impact how often she uses her abilities and how effective she is when assigned to workstations like the Water Filter or Brewing Barrel. 

Let’s start with lighting. Not just any lighting—Blue Light, specifically. This glowing fixture isn’t just mood lighting for ambiance; it actively accelerates her Mood Regeneration, which is critical for her to operate at full strength. To install Blue Light, you need to unlock the Basic Furniture II node in the Building Memetics skill tree. Once crafted, place it close to her Securement Unit. You’ll notice improvements in her morale and overall mood gain, which translates into better ability uptime. The Once Human Hydronaut Fish Guide strongly recommends prioritizing this furnishing early once she joins your base. 

Enhancement Tool	Benefit
Blue Light	Boosts mood regeneration
Plush Toys	Crafted via Season Shop formula; improves emotional state
Flowers	Planted near unit to increase overall comfort and power gain
Required Skills	Basic Furniture II (Building Memetics), Planting Node (Logistics Memetics)

Now, onto the toys. The Hydronaut Fish has a soft spot for plushies—a character trait that somehow makes her even more endearing. You’ll need the Formula: Plush Toy, which you can purchase from the Season Shop. Once unlocked, craft plushies and arrange them near her Securement Unit. These aren’t idle decorations—they’re coded to boost her mood further. A fish that builds spacesuits and debates quantum logic also finds joy in soft toys. It’s one of those odd but charming design choices the game embraces, and the Once Human Hydronaut Fish Guide is here for all of it. 

Finally, round out her happiness setup with flowers. These floral additions create a more natural and visually pleasing environment, contributing another layer of mood regeneration. But you can’t just toss down tulips—you’ll need to unlock the Planting node from the Logistics Memetics skill tree. With Blue Light, plush toys, and flowers working in harmony, your Once Human Hydronaut Fish becomes not only efficient but borderline unstoppable in her support role. The Once Human Hydronaut Fish Guide underscores a simple truth: treating your intelligent goldfish with care isn’t optional—it’s strategic. 

Once Human Hydronaut Fish: Quest Rewards 

C Completing the “Deviation: Hydronaut Fish” quest isn’t just about befriending a sentient goldfish in a mech suit—it’s also one of the more rewarding Level 3 World Tasks in Once Human. This section of the Once Human Hydronaut Fish Guide takes a closer look at what you get for your effort, and why it’s a must-complete for players who value both function and fun. Sure, you gain a lovable Deviant with a taste for plush toys, but the real icing on the cake is the pile of loot she brings with her. 

Let’s start with the Energy Link ×200. These aren’t just filler rewards—they’re essential currency used throughout the game for activating modules, crafting essential gear, and powering up territory-specific utilities. For newer players, this sudden injection of Energy Links can open doors to upgrades that would otherwise take days to grind. Even veterans will appreciate the boost, especially when you’re trying to squeeze every ounce of efficiency out of your base setup. The Once Human Hydronaut Fish Guide recommends using this batch to unlock or power key systems like high-tier water filtration or production stations that synergize well with Hydronaut’s abilities. 

Quest Reward	Quantity	Use
Energy Link	×200	Fuel for modules and utilities
Experience	×600 XP	Contributes to world progression
Stellar Planula	×10	Used for upgrading deviations and crafting
Eclipse Cortex Lv.2	×1	Upgrade component for high-end systems

Then there’s the 600 XP, which might not sound like much at first glance, but it adds up—especially if you’re progressing through early-to-mid game. This XP feeds into your world level and territory development, nudging your growth along and unlocking more crafting recipes and challenges. It’s a clean little bonus, and when combined with the utility of Hydronaut herself, makes the entire questline a smart and efficient use of your time. The XP isn’t what makes the quest stand out, but in the context of Once Human, every little bit contributes to unlocking deeper systems and faster leveling. 

The real gem here, though, is the Stellar Planula ×10 and Level 2 Eclipse Cortex. Stellar Planula are rare crafting materials primarily tied to Deviant development—they help you upgrade Hydronaut’s Securement Unit and abilities, making her more effective sooner rather than later. The Eclipse Cortex, meanwhile, is a high-end material that’s difficult to farm and used in upgrading elite utilities. It’s the kind of item you hoard, then spend with careful planning. These two items alone justify the time spent on the quest. According to this Once Human Hydronaut Fish Guide, the combination of rewards makes “Deviation: Hydronaut Fish” one of the most strategically valuable World Tasks for utility-focused players. 

Once Human Hydronaut Fish: Understanding “Deviants” vs. “Deviations” 

If you’ve spent more than five minutes in Once Human, you’ve probably noticed that the game throws around the terms “Deviant” and “Deviation” like confetti. It’s easy to confuse the two—especially since even NPCs in-game occasionally mix them up—but the Once Human Hydronaut Fish Guide is here to clear up the confusion. These aren’t just cosmetic distinctions; understanding the difference helps you grasp the game’s deeper mechanics and lore, especially when dealing with intelligent companions like the Hydronaut Fish. 

Term	Definition
Deviant	Living creature affected by Stardust (e.g., Hydronaut Fish)
Deviation	Anomalous object or event warped by Rift-space or Stardust exposure
Game Context	Deviants = Collectibles/companions; Deviations = Quest-related anomalies
Example	Hydronaut Fish = Deviant in a Deviation Quest

A Deviant, in the most straightforward sense, is a living creature that’s been mutated by Stardust. These include hostile monsters, roaming anomalies, and most importantly, companions that can be tamed or secured. The Hydronaut Fish falls into this category perfectly. She’s not just a fish in a suit; she’s a sentient being with dialogue, tasks, and skills. As the Once Human Hydronaut Fish Guide explains, if it can be placed into a Securement Unit, has mood stats, and offers passive or active utility, you’re dealing with a Deviant. This classification is important because it determines how you interact with the entity—whether through battle, quest dialogue, or by building an emotional fish paradise with plush toys and flower beds. 

Now, Deviations are a different beast—literally and figuratively. These are more like systemic disruptions than beings. They can appear as haunted objects, mysterious locations, time loops, or event-driven quest structures. When a quest is called “Deviation: Hydronaut Fish,” it doesn’t mean the fish is a Deviation itself. Instead, it means the storyline is based around an anomaly or Stardust-induced phenomenon—in this case, our tech-savvy goldfish. The Once Human Hydronaut Fish Guide makes it clear: Deviations are the weird, wild byproducts of Stardust that twist the laws of nature, while Deviants are the creatures that live with (or suffer from) its consequences. One warps reality, the other shares your campfire and maybe does your laundry. 

Frequently Asked Questions (FAQ)