13601
The tissue - specific accumulation and species - specific metabolism of polybrominated diphenyl ethers ( PBDEs ) in two predator fish species ( redtail catfish and oscar fish ) feeding on the same prey ( tiger barb ) that was exposed to technical pentabrominated diphenyl ether ( DE - 71 ) in the laboratory were investigated .
 Chemical: polybrominated diphenyl ethers; Chemical: PBDEs; Chemical: pentabrominated diphenyl ether; Chemical: DE - 71
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: polybrominated diphenyl ethers; Chemical: PBDEs; Chemical: pentabrominated diphenyl ether; Chemical: DE - 71