Possible Answers

Here are my answers to the questions that I posted about croc scaling. The 16 foot saltwater croc that lives in saltwater would be about 640 lbs (twice as long, but eight-times heavier), where the 16 foot saltwater croc that lives in freshwater would be about 1200 lb. In fact, Thomas caught a 16 footer in a freshwater lagoon in Costa Rica that was about 1200 lbs. I think that the osmotic stress imposed by being in saltwater may have a significant enough cost that american saltwater crocs that live in saltwater don't have as much energy available to grow as the individuals that live mostly in freshwater.