Turtles will not eat therefore will not breed.
I have an enclosure of 4 turtles. One will always eat consistently, but the other three will not. Turtles are on sand.
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Interesting I wasn't aware of the spawn area requirement. This sounds like it. I'll unfence and see where they go. Thanks for the feedback.
Some of the turtles might have eggs, and are attempting to go to the block they spawn at so they can lay eggs. Turtle breeding works differently from most mobs, in that you have to enclose them in the area they spawned, rather than dragging them to your house.
Either that, or you are attempting to breed them with raw cod, which no longer works; you must feed them sea grass.
The photo provided supports the first argument; notice how 3 turtles are heading towards the same corner. They are attempting to go to the place they hatched to lay eggs, which is why they aren't breeding.