In a little while the fishermen were out into the open sea, and all began to scan the pulsating bosom of the Gulf Stream with fresh interest.  Strange as it may seem, the fish of tropical waters do not appear to have the slightest apprehension of danger from the noise of a motor-boat, and one cannot only get very close to them, but can follow them about and observe their movements without trouble, particularly if he is familiar with their habits.