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This is about Eastern Balic cod, so theoretically genes from, for example, Norwegian cod could be spliced in. However body size is usually a polygenic trait with potentially hundreds of genes involved, so that's not possible.

If there is a survival advantage to larger cod (presumably there is, or they would not have developed) and if fishing is tightly regulated, they should return eventually.

Not necessarily — the “large” genes could literally have been extracted from the gene pool.

It’s possible for them to mutate back into existence, but that’sa lower-probability, much longer proposition than if the genes are still available and just selected against.

* I meant "extincted" from the gene pool -- auto-correct un-corrected me...

Or, instead of wooly mammoths, bring back fishy ones.