Subchronic exposure to nitrite, potassium and their combination on survival, growth, total haemocyte count and gill structure of juvenile blue swimmer crabs, Portunus pelagicus

Romano, Nicholas, and Zeng, Chaoshu (2009) Subchronic exposure to nitrite, potassium and their combination on survival, growth, total haemocyte count and gill structure of juvenile blue swimmer crabs, Portunus pelagicus. Ecotoxicology and Environmental Safety, 72 (4). pp. 1287-1295.

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Abstract

Among anthropogenic discharges, nitrite and potassium can simultaneously enter aquatic ecosystems at high loading rates which can threaten marine animals. The sensitivity of early juvenile blue swimmer crabs, Portunus pelagicus, to the subchronic exposure to nitrite, potassium and their combination was evaluated by measuring the survival, growth, total haemocyte count(THC)and gill histopathological changes. In all NaNO2-N and KNO2-N treatments the survival substantially decreased, many due to ‘‘molt death syndrome’’, along with significantly lower (po0.01) specific growth rates(SGR). Although fewer deaths occurred in the KCl-K treatments, the SGR at the higher concentrations were significantly less (po0.05) than the control. The gill histopathological changes following elevated NaNO2-N, KNO2-N and KCl-K exposure showed drastic but similar damage. In spite of a long term healing response, indicated by a significant hemolymph THC increase (po0.01) and several gill lamellae modifications, early P. pelagicus juveniles are highly sensitive to elevated NO2-N levels.

Item ID: 7943
Item Type: Article (Refereed Research - C1)
Keywords: Portunus pelagicus, chronic nitrite, chronic potassium, molt death syndrome, total haemocyte count, gill histology, marine science, AFDC
ISSN: 1090-2414
Date Deposited: 18 Jan 2010 01:31
FoR Codes: 06 BIOLOGICAL SCIENCES > 0608 Zoology > 060806 Animal Physiological Ecology @ 50%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050204 Environmental Impact Assessment @ 50%
SEO Codes: 96 ENVIRONMENT > 9605 Ecosystem Assessment and Management > 960504 Ecosystem Assessment and Management of Farmland, Arable Cropland and Permanent Cropland Environments @ 50%
97 EXPANDING KNOWLEDGE > 970105 Expanding Knowledge in the Environmental Sciences @ 50%
Citation Count from Web of Science Web of Science 12
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