填空题

When home is approximately 2,000 feet under the surface of the sea, it is challenging to have your photograph taken. In Japan, however, a species of shark that is almost never seen because of its deep natural habitat came close enough to the top to grab the attention of some fishermen. This five-foot long, eel-shaped shark was caught and soon identified as a female frill shark, a primitive species that has gone through little alteration since prehistoric times. Cameras captured it while it was still swimming so that scientists could learn as much as possible from this single specimen of a mysterious species.
Which of the following is implied about scientific documentation of frill sharks