6941
This had had a detrimential effect on the ecology of the harbour which at the turn of the 20th century had been a popular and attractive place to swim , sail , fish and gather shell fish .
 None
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:  
Answer:
 None