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"This category [science fiction] excludes rocket ships that make U-turns, serpent men of Neptune that lust after human maidens, and stories by authors who flunked their Boy Scout merit badge tests in descriptive astronomy."
- Robert Heinlein

Robot Fish (Metal Fish)  
  Fake flounders for sport fishermen on Martian canals.  

Earliest use of the phrase "robot fish", as far as I know.

Deveet’s line tightened. He pulled in a streamlined, flapping object from which the light glistened wetly.

“Good catch,” complimented Jonner. “That’s worth a full credit.”

Deveet unhooked his catch and laid it on the bank beside him. It was a metal fish: live fish were unknown on Mars. They paid for the privilege of fishing for a certain time and any fish caught were “sold” back to the management at a fixed price, depending on size, to be put back into the lake.

“You’re pretty good at it,” said Jonner. “That’s your third tonight.”

“It’s all in the speed at which you reel in your line,” explained Deveet. “The fish move at pre-set speeds. They’re made to turn and catch a hook that moves across their path at a slightly slower speed than they’re swimming. The management changes the speeds once a week to keep the fishermen from getting too expert.”

Technovelgy from Atom Drive, by Charles Fontenay.
Published by If in 1956
Additional resources -

Compare to the robofish from Slow Life by Michael Swanwick.

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Additional resources:
  More Ideas and Technology from Atom Drive
  More Ideas and Technology by Charles Fontenay
  Tech news articles related to Atom Drive
  Tech news articles related to works by Charles Fontenay

Articles related to Robotics
Robot Snakes No Longer Stopped By Stairs
Challenges Of Two-Armed Robots
AlphaGarden Robot Cares For Gardens Better Than Humans
TeslaBot Uber Driver (2024) And The Automatic Motorist (1911)

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Robot Snakes No Longer Stopped By Stairs
'...she dropped her hands from the wheel, took the robot snake from his box.'

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'the real border was defended by ...a swarm of quasi-independent aerostats...'

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