1
Begin with a body of water
Lakes, rivers and reservoirs each shape life differently. Pick one of nine reference waters from the list or the world map.
Offline field guide · Free on iPhone & iPad
DepthLab
Explore what lives beneath the surface.
Pick a lake, river or reservoir and descend from the shoreline to deep water. See which freshwater species use every zone — and exactly why that habitat suits them.
9reference waters
5depth zones
21species
6Lab conditions
Works offline
No account
No ads or tracking
9:41
0 m
1 m How DepthLab works
A dive in four stops
The same four pages that greet you on first launch — from choosing a body of water to testing conditions in the Lab.
2
Descend through the zones
Scroll a water’s page from shore to deep water. Light, colour and temperature change with every band, and a depth dial shows where you are.
3
See who belongs where
Every zone lists the species that may use it, and every profile explains why that habitat suits them. Opening a profile logs a sighting.
4
Test the conditions
Set temperature, time of day, weather, depth, clarity and cover in the Lab. A transparent set of rules shows which species may fit, and why.
3 m Habitat zones
Five bands, from shore to deep water
Every water in DepthLab is read through the same five zones. Light fades, temperature steadies, and different fish take over as you go down.
5 m Conditions Lab
Try the Lab right here
This is the app’s own rule set. Set the conditions — a transparent set of rules scores every species and shows which factors matched. Nothing is learned, and nothing leaves your device.
DepthLab is an educational model. Results describe species that may fit a set of conditions from general habitat preferences. Real waters vary, and nothing here guarantees what you will find.
8 m Inside the app
Five chapters of a field guide
Waters, Species, Lab, Quiz and Logbook — each one a tab, each one working fully offline.
Nine reference waters
Lakes, rivers and reservoirs from Lake Baikal to the Mississippi, pinned on a world map. Each page shows its basin and how every zone looks in that particular water.
21 illustrated species
Depth and temperature ranges, diet, activity and a plain explanation of why each habitat suits the fish. Search by name, Latin name or family.
A Lab that shows its working
Six conditions, rule-based scores and every factor spelled out — plus bait categories backed by the species that fit. File a set of conditions to revisit later.
Quiz with reasons
Short questions on habitat, depth and conditions. Every answer comes with the reason behind it, and missed questions can be retried.
A logbook of every dive
Sightings, explored waters, favourites and milestones on one timeline — rise from Surface swimmer to Field biologist.
Offline and private
No account, no sign-in, no ads, no analytics. Your logbook is a single file on your device — nothing is ever uploaded.
12 m The catalogue
21 species, each with its own plate
From pike in the weed beds to burbot in the cold dark — every fish is drawn, ranged and explained.
15 m Nine waters
Real lakes, rivers and reservoirs
Each one lists the catalogued species recorded there and a note on how every habitat zone looks in that water.
18 m Contact
Send a message to the surface
A question, an idea, or a species you’d like to see in the guide? We read every message.
Supportmail@aeonpath.site
20 m You reached the bottom
Start your first descent
Nine waters, five zones and 21 species are waiting below the surface. Download DepthLab and open your logbook.
Free · iPhone & iPad · Works offline