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Study on the oxyhemocyanin, deoxyhemocyanin, oxygen affinity and acid-base balance of Marsupenaeus japonicus following exposure to combined elevated nitrite and nitrate
Cheng, S.-Y.; Chen, J.-C. (2002). Study on the oxyhemocyanin, deoxyhemocyanin, oxygen affinity and acid-base balance of Marsupenaeus japonicus following exposure to combined elevated nitrite and nitrate. Aquat. Toxicol. 61(3-4): 181-193
In: Aquatic Toxicology. Elsevier Science: Tokyo; New York; London; Amsterdam. ISSN 0166-445X, more
Peer reviewed article  

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Keywords
    Haemocyanins; Nitrates; Nitrites; Marsupenaeus japonicus (Spence Bate, 1888) [WoRMS]; ISEW, Taiwan [Marine Regions]; Marine

Authors  Top 
  • Cheng, S.-Y.
  • Chen, J.-C.

Abstract
    Marsupenaeus japonicus (11.47±0.71 g) exposed individually to six different nitrite and nitrate regimes {(0.002 (control), 0.359 and 1.456 mM nitrite combined with 0.005 (control) and 7.458 mM nitrate)} in salinity of 30 ppt (parts per thousand) were examined for hemocyanin oxygen affinity, the fractionation of oxyhemocyanin and deoxyhemocyanin, and the acid-base balance after 24 h. Ambient nitrite at concentration of 0.359 mM caused reduction of oxyhemocyanin and protein by 27 and 11%, respectively, whereas ambient nitrate as high as 7.458 mM caused reduction of oxyhemocyanin and protein by 10 and 7%. Ambient nitrite at concentration of 1.456 mM caused increases of P50 (indicating reduced oxygen affinity) and pO2, but caused reduction in hemolymph pCO2, pH, HCO3- and TCO2. Following exposure to combined solutions of 1.456 mM nitrite and 7.458 mM nitrate there were no further changes in oxyhemocyanin, protein, hemolymph P50, pO2, pCO2, HCO3- and TCO2, but there was a significant reduction of pH.

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