Tilapia like privacy when they breed , usually. We have a special tank just for 'breeders'.
That is where they are suppose to have sex and make little fish. The two big tanks are where they grow and turn into fish fillets.
Last week we noticed something was eating the roots of the plants and the tiny mosquito fish in the plant troughs were disappearing. So we did a test. Dropped a few pieces of fish food in a plant trough and watched .
Several 6 inch Tilapia came in for a snack. We repeated it with a fish net in hand.
Several fish later we thought we had them all. Three days later we repeated the test and caught several two inch Tilapia.
So how did they get from the breeding tanks into the fillet tank and through the filters and into the plant troughs? Seems some of the fillet fish didn't mind having sightseers around when they made whoopee.
They created fry and when we washed the filters the tiny fry swam into the troughs . Then they ate
the mosquito fish and some of the plant roots . After a month or so they were doing some real damage to the system.
Guess we need to be faster when we wash filters.
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