Osmoregulatory balance in Murray cod, Maccullochella peelii peelii (Mitchell), affected with chronic ulcerative dermatopathy
Data(s) |
01/08/2008
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Resumo |
This study examined the osmoregulatory capability of Murray cod, <i>Maccullochella peelii peelii</i>, affected by chronic ulcerative dermatopathy (CUD) in intensive aquaculture. This condition appears to arise only in facilities utilizing groundwater, with the causative agent suggested to be a water-borne factor. Healthy Murray cod (~ 700 g) were transferred to a CUD-affected farm to monitor the progression of the syndrome and began to show signs of CUD after approximately five months. In order to evaluate possible effects of CUD on osmoregulation; plasma electrolyte concentrations, osmolality, and Na<sup>+</sup>,K<sup>+</sup>-ATPase activities were measured, and gill histology and immunohistochemistry were analyzed. Plasma electrolyte concentrations and osmolality of CUD-affected Murray cod were consistent with reference values determined for non CUD-affected fish. A greater number of gill mucous cells were observed in Murray cod cultured at the CUD-affected farm compared to non CUD-affected fish. We also found an un-identified cell type that was present solely in the gills of CUD-affected Murray cod. Gill Na<sup>+</sup>,K<sup>+</sup>-ATPase activity was significantly higher in severely CUD-affected Murray cod compared to individuals transferred to the CUD-affected farm. While there appeared to be some minor changes in the gills of CUD-affected fish, this study demonstrated that Murray cod were able to effectively osmoregulate, although, perhaps at an energetic cost.<br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Elsevier B.V. |
Relação |
http://dro.deakin.edu.au/eserv/DU:30017616/schultz-osmoregulatory-2008.pdf http://dx.doi.org/10.1016/j.aquaculture.2008.04.011 |
Direitos |
2008, Elsevier B.V. |
Palavras-Chave | #Murray cod #pathology #osmoregulation #chronic erosive dermatopathy #chronic ulcerative dermatopathy |
Tipo |
Journal Article |