title: Proximate composition and lipid stability of dourado (Salminus brasilensis, Cuvier, 1817) fillets exposed to different levels of ammonia and oxygen in vivo.
abstract: BACKGROUND
  The ammonia and oxygen levels of water are physicochemical parameters that affect fish physiology. Thus, we hypothesized that in vivo exposure to stressful ammonia and oxygen levels will affect the post-mortem quality of the fish. Therefore, in this study, the effects of in vivo exposure to stressful ammonia and oxygen levels on the composition and content of thiobarbituric acid reactive substances in fillets from dourado (Salminus brasiliensis) and on the lipid oxidation of these fillets during frozen storage were evaluated.
  
  
  RESULTS
  Short-term exposure (12 h) to stressful environmental conditions (low oxygen and high ammonia levels) did not change the composition of the flesh. However, longer exposure (15 days) to these stressful conditions caused significant changes in the composition of the flesh. Exposure to a stressful ammonia level before slaughtering increased the susceptibility of the fish fillets to lipid oxidation during frozen storage. In contrast, exposure to low oxygen levels did not increase the lipid oxidation rate of the fillets.
  
  
  CONCLUSIONS
  These results indicate that the in vivo exposure to high ammonia levels may reduce the quality and stability of dourado fillets.
authors: Núcleo Integrado de Desenvolvimento em Análises Laboratoriais (NIDAL), Departamento de Tecnologia e Ciência dos Alimentos, Centro de Ciências Rurais, Universidade Federal de Santa Maria, Camobi, Santa Maria, RS, Brazil.
authors: Ana Paula L
authors: AP
authors: Veeck
authors: Luciano O
authors: LO
authors: Garcia
authors: Bernardo
authors: B
authors: Baldisserotto
authors: Evoy
authors: E
authors: Zaniboni Filho
authors: Tatiana
authors: T
authors: Emanuelli
mesh_terms: D000641:Ammonia / Q000494:pharmacology*; D000818:Animals; D004032:Diet; D005399:Fishes / Q000378:metabolism*; D061353:Food Storage / Q000379:methods*; D005615:Freezing; D006801:Humans; D000860:Hypoxia; D015227:Lipid Peroxidation / Q000187:drug effects*; D010100:Oxygen / Q000378:metabolism*; D012034:Refrigeration; D017747:Seafood / Q000032:analysis* / Q000592:standards; D013312:Stress, Physiological; D017392:Thiobarbituric Acid Reactive Substances
chemical_list: D017392:Thiobarbituric Acid Reactive Substances; D000641:Ammonia; D010100:Oxygen