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In Los Angeles , George Bliss Culver , one of the many volunteers of David Starr Jordan , encouraged Hubbs to abandon his study of birds and instead to study fish , particularly those fish that inhabited the rivers of Los Angeles , which at that time had not been well researched .
 person: David Starr Jordan; person: Hubbs
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities: David Starr Jordan, Hubbs 
Answer:
 person: David Starr Jordan; person: Hubbs