Spring-powered mechanical movement: Delivers smooth, lifelike fish and algae motion for immersive play
Pendulum regulation mechanism: Ensures consistent and gentle motion for a realistic aquatic experience
325-piece DIY assembly: Offers a challenging, rewarding build with step-by-step instructions in 11 languages
Hidden seahorse detail: Adds a whimsical touch and encourages observation and curiosity
No glue or special tools required: Allows for easy, mess-free assembly
Summarized by Shop
Mechanical Aquarium Assemble & Watch the fish swim!
The Mechanical Aquarium from Ugears is an ingenious saltwater aquarium, with two pet tropical fish chasing each other around a forest of macroalgae fronds, inside of which hides another small inhabitant of the marine environment—a seahorse! The fish and algae rotate simultaneously an
Model Size
9.3 x 9.3 x 7.9 in
Package Size
14.9 x 6.7 x 1.3 in
Number of Parts
325
Assembly Time
6 hours
Recommended Age
14+
Kit Weight
1.76 lbs
Materials
Wood, Metal
Summarized by Shop
4.8
5 ratings
5
4
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1
Love it, and love to watch the fish swim
C
Cynthia · June 19, 2026
Ingenious linkage inside the "fish" allows them to "swim" when they rotate round the "tank". Two minor problems were incurred.
1) The pre-wound spring was tricky to locate in its split wheel, even with the tool allowing the builder to unwind it from the centre.
This was solved successfully, by pushing the centre turn sideways, then rotating the whole assembly round and round, rewinding each turn outside the previous one, until all was wound onto the small wheel.
2) The release escapement (a block of three layers), which was a bit sticky at first, needed careful sanding so the pivot was free to allow movement.
A
Anonymous · April 6, 2026
Det var lite klurigt att få alla kugghjulen till att gå smidigt Smörjan som levererades räckte ej till men jag smorde med paraffinolja och då fungerar bygget problemfritt.