Aloha!

Have you ever wanted an automated fishing experience in MC? Now you can!!

Behold the BRD Fish Farm. This device uses Redstone and command blocks to spawn and harvest 4 types of fish.
How it works: The machine has 2 timers- The first is a 5 minute spawn timer that spawns the fish of your choice into the spawning pool. This timer is stopped over night and reinitiated by dawn or the approach of a player by natural chunk load. This timer can be disabled via the access at the rear of the unit.
The other timer (also stopped at night) controls the on and off flow of water between the spawn pool and the harvest platform made of hoppers. When the flow is cut the fish left on the harvest platform expire and are passed to the ejector that sends the drops to storage and repulses the command block to spawn a new fish to the pool with every drop that is ejected.

The design is meant to be similar to the APU in that it is a unit that can be pasted and tied into an existing farming network.

Please Note: You will need to edit the fish command blocks to reflect the center of your pasted spawning pool.\

(WARNING: This farm can be a severe lag machine if misused)

Schematic: Is taken facing North- standing @ the front left corner (side with the chests), 8 blocks wide, 13 blocks deep and 13 tall- all above
ground.
Remember to paste redstone asynchronously using methods like Carpet or Fastasynchworldedit. Pasting in tick time presents immediate block updates upon paste among other anomalies that break redstone builds.

No mods required- Vanilla friendly.

A custom version of this build is incorporated in a larger build here: www.planetminecraft.com/project/1-chunk-farm-tower/

This build is also custom incorporated in a world download with more content located here: www.planetminecraft.com/project/spawn-build-5443036/