Atlantic sailfish. Atlantic sailfish are found in tropical and temperate parts of the Atlantic Ocean, though juveniles have been found in the Mediterranean Sea. Adults can weigh up to 60kg. Females grow larger than the males.Scientific name: Istiophorus albicans.tlantic sailfish are found in tropical and temperate parts of the Atlantic Ocean, though juveniles have been found in the Mediterranean Sea. Adults can weigh up to 60kg. Females grow larger than the males. Scientific name: Istiophorus albicans.