Effect of Nitrite on Oxygen Consumption and Ammonia Excretion of the Fresh Water Crab Paratelphusa jacquemontii (Rathbun)

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  • B. S. Vijaykumar PG & Research Department of Zoology, Khadir Mohideen College, Adirampattinam-614701, Thanjavur Dist, Tamil Nadu, India
  • Y. Narayanasamy PG & Research Department of Zoology, Khadir Mohideen College, Adirampattinam-614701, Thanjavur Dist, Tamil Nadu, India
  • P. S. Paruruckmani PG & Research Department of Zoology, Khadir Mohideen College, Adirampattinam-614701, Thanjavur Dist, Tamil Nadu, India
  • R. Archana PG & Research Department of Zoology, Khadir Mohideen College, Adirampattinam-614701, Thanjavur Dist, Tamil Nadu, India

Klíčová slova:

nitrite, oxygen consumption, ammonia excretion, paratelphusa jacquemontii

Abstrakt

In aquatic ecosystem, nitrite concentrations are elevated by pollution with nitrogenous wastes and imbalances in bacterial nitrification and denitrification processes. Nitrite is transformed by nitrification to nitrate under aerobic condition. The effects of nitrite on physiology were investigated in the fresh water crab, Paratelphusa jacquemontii (carapace length 4–5 cm and weight 50–70 g) for 96 h. The crabs were exposed to sublethal concentration (1/10th and 1/20th of 96 h LC50) of nitrite for a period of 15 days. The treatments of these nitrites brought about significant decrease in oxygen consumption and ammonia excretion as compared to control. The significance of these studies as bioindicator for assessing the toxicity and economic importance of the crab are discussed.

Stažení

Publikováno

2013-06-14

Číslo

Vol 4 No 1 (2013)

Sekce

Research Articles

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