93879
To lay her roe , the female salmon uses her tail ( caudal fin ) , to create a low-pressure zone , lifting gravel to be swept downstream , excavating a shallow depression , called a redd .
 roe
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:
 roe