See Nemo's Eye in Action
Uncover the underwater world in real-time
Know what's happening below the surface.
Know why fish are where they are
Fish finders show you where fish are. Nemo's Eye tells you why they're there — and tips on how to approach. Track fish at different depths alongside the oxygen, temperature, and water conditions driving their behavior. It's the difference between seeing a dot on a screen and understanding what put it there.
See conditions at depth
Most apps estimate conditions from a weather station miles away. Nemo's Eye reads the actual water where your line is — how clear it is, how warm, how deep, and whether conditions are changing.
Get plain-language intelligence
The app translates raw measurements into species-specific recommendations. No science degree needed — just fish smarter.
How It Works
Drop in the sensor
Lower the sensor over the side to your target depth. One hand, one motion — it starts reading the second it hits the water.
Read the water
Your phone connects automatically and shows you what's happening below — fish depth, water temperature, clarity, oxygen levels, and pressure — updated live, right on your screen.
Fish with intelligence
The app tells you what species are likely active, what to throw, and why. When you catch one, it logs exactly what conditions made it happen — so you can repeat it.
What It Measures — And Why It Matters
Every reading below answers a specific question about what fish are doing and why. No science degree needed — just better decisions on the water.
What It Measures
Fish breathe oxygen that's dissolved in the water, just like we breathe oxygen in the air. Some parts of a lake have plenty of oxygen and some parts have almost none — especially deeper water in the summer. Nemo's Eye gives you an exact reading in ppm (parts per million) at whatever depth you drop the sensor.
How It Affects Fish Behavior
When oxygen gets too low, fish stop eating and move somewhere else — usually shallower. Bass like a lot of oxygen. Walleye want even more. If the reading is low at your depth, the fish aren't there. Move up. This one measurement alone tells you which depths are worth fishing and which are dead water.
What the Numbers Mean (ppm)
No fish can survive here for long. Don't waste a cast.
Lethal for all gamefish. Only carp and bullheads last briefly.
Fish are in survival mode. Not feeding — trying to breathe.
Bass stop feeding at 2 ppm. Walleye are first to die.
Fish present but sluggish. Marginal water.
Bass minimum ~5 ppm. Sunfish/crappie tolerate 4.7. Trout avoid.
Healthy water. Most warmwater species active and feeding.
Bass comfortable. Walleye/perch thriving. Pike holding.
The sweet spot. Active feeding across species.
Bass optimal. Walleye preferred (8.6+). Pike/musky ~9. Trout thrive.
Near heavy vegetation in sunlight. Fish often active.
All species tolerate. Watch for drops after sunset.
What's Inside
The pieces that come together to put real answers on your screen.
Connects to Your Phone
Drop the sensor in the water and your phone picks it up automatically. Readings stream live to your screen with minimal battery drain on either end. No pairing menus, no setup — it just works.
Remembers Every Spot
The app logs conditions and catches so you can see what worked and why. Over time, you build a playbook — which spots produce, what conditions were like when the bite was on, and how to repeat it next time out.
Works With Your Fish Finder
Coming SoonPlug into your existing fish finder and see sonar and environmental data in one place — where the fish are AND why they're there. Future versions will include built-in sonar — no separate fish finder needed.
Nemo's Brain
ProprietaryThe sensor collects the data. Nemo's Brain makes sense of it. It takes what's happening in the water right now — oxygen, temperature, clarity, pressure, depth — and translates it into plain-language recommendations for the species you're targeting.
No charts to interpret. No numbers to look up. Just straightforward guidance: what depth to fish, what to throw, and whether conditions favor an aggressive or finesse approach.
It works offline from the first cast. Over time, it learns from your sessions and from the broader angler community — getting smarter the more people fish with it.
Why This Is Different
Fish finders show you where fish are. Underwater cameras show you what's in front of the lens. Neither one tells you why fish are behaving the way they are — or what to do about it.
Nemo's Eye measures the environmental conditions that drive fish behavior — oxygen levels, water temperature at depth, thermocline position, water clarity, and barometric pressure trends. These aren't random data points. They're the variables that decades of peer-reviewed fisheries research have confirmed determine where fish go, when they feed, and why they stop.
The intelligence engine translates those readings into plain-language recommendations for specific species. Instead of staring at a sonar screen trying to guess what a mark means, you get actionable guidance: what depth range to target, what presentation to use, and whether conditions favor an aggressive or finesse approach.
And every session generates GPS-tagged, anonymized water quality data that feeds cooperative partnerships with state agencies and conservation organizations — helping monitor the lakes and rivers that matter most. You don't do anything extra. The tool you use to fish smarter simultaneously helps protect the water.
Fish Finder
Shows depth contours and marks that might be fish. Great for locating structure and seeing what's below the boat. But it can't tell you why fish are at that depth or whether they're likely to bite.
Shows where. Doesn't explain why.
Underwater Camera
Shows you exactly what's in front of the lens — species ID, behavior, structure detail. But it's a narrow field of view, affected by water clarity, and tells you nothing about conditions outside the frame.
Shows what. Limited to the lens.
Nemo's Eye
Measures the conditions that determine fish behavior — oxygen, temperature, thermocline, clarity, pressure — and translates them into species-specific recommendations. Tells you why fish are where they are and what to do about it.
Shows why. Tells you what to do.
More Than a Fishing Tool
Every session on the water generates anonymized water quality data that helps monitor the lakes, rivers, and streams we all depend on. Most lakes in America get tested once every few years. A fleet of anglers changes that.
See the bigger mission →See the underwater world like a pro
Join the waitlist — be first on the water.
Built on the Water
Nemo's Eye was built by a lifelong angler who saw the gap between the science that existed and the tools available to use it. Decades on the water in Wisconsin and Minnesota — from the Lake Minocqua chain to the metro lakes — shaped every decision in this product.
Read the full story →Get in Touch
Interested in partnering, investing, or just want to talk fishing? Reach out.
nemoseye@proton.me