Some salmon have been genetically modified to grow bigger and mature faster than wild salmon. They are kept in fish facilities. Which statement regarding genetically modified salmon is correct

The first statement is correct. Genetically modified salmon produce more growth hormone protein which enables them to grow all year round.

Explanation:
The following is the explanation why all other sentences aren't correct.
Genetically modified salmon and wild salmon would't have identical DNA. The genetically modified are ~99.99986% salmon, with the addition of 4,205 base pairs. Wild salmon reproduce sexually while the genetically modified salmon is sterile. Wild salmon don't an altered protein sequence, genetically modified ones do.