In 9 days you can get a full stack of items from a fishpond.

Alexa's channel:
@alexion3007

FAQ:
Q: HOW?!
A: Animal Crackers double the output from a fish pond. If a fish pond doesn't produce an item, the previous day's produce will double instead. Keep on doubling and you end up with 999.

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Alexa's dupe sequence:
Step 1 Find a specific spot in the pattern. This specific spot is "no roe, noe roe, roe".
Note down the current location of the fish pond [I use a stone owl] and be prepared to move specific quantities left and right [I place down paths to help with that]

Step 2 Sleep Once

From here, the sleeping and the movement is consistent.
Step 3 Move fish pond 4 to the right, sleep 10 times [safe to move one early]
Step 4 Move fish pond back to stone owl, sleep 9 times [safe to move one early]
Step 5 Move fish pond 3 to the right, sleep 11 times [not safe to move one early, if necessary move one left of stone owl for between 1 and 10 times and then continue to step 6 with the according amount of sleeps counted]
Step 6 Move fish pond back to stone owl, sleep 12 times [safe to move one early]
Step 7 Move fish pond 3 to the right, sleep 9 times [safe to move one early]
Step 8 Move fish pond 4 to the left [1 to left of owl], sleep 9 times [safe to move one early]
Step 9 Move fish pond 3 to the right [2 to right of owl], sleep 7 times [safe to move one late]


To optimally obtain roe, sleep 9 times in step 3 and then start collection. IMPORTANT On any fish that isn't tiger trout, you need to fish out the extra breeding fish. Tiger trout is good to practice on since you don't need to, but it's critical that you do fish out the excess each time

2.3% chance of process failing by/on day 231, 8% by 298, 13% by 365 but it shouldn’t get that long.