12532
In 1881 , David Starr Jordan and Charles Henry Gilbert observed that this sucker " occurs in Utah Lake in numbers which are simply enormous " ; the population seems to have boomed and crashed several times since then .
 David Starr Jordan, Charles Henry Gilbert, Utah Lake
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 David Starr Jordan, Charles Henry Gilbert, Utah Lake