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We examined the acute physiological responses to high environmental ammonia ( HEA ) , particularly the linkages between branchial ammonia fluxes and unidirectional Na ( + ) fluxes , as well as urea excretion , cortisol , and indicators of gill permeability in three freshwater teleosts differing in their sensitivities to ammonia ; the highly sensitive salmonid Oncorhynchus mykiss ( rainbow trout ) , the less sensitive cyprinid Cyprinus carpio ( common carp ) and the highly resistant cyprinid Carassius auratus ( goldfish ) .
 Chemical: ammonia; Chemical: ammonia; Chemical: Na ( + ); Chemical: urea; Chemical: cortisol; Chemical: ammonia
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: ammonia; Chemical: ammonia; Chemical: Na ( + ); Chemical: urea; Chemical: cortisol; Chemical: ammonia