Answer:
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.