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Metabolic and osmoregulatory responses of snapper (Pagrus auratus), mulloway (Argyrosomus japonicus) and yellowtail kingfish (Seriola lalandi) in saline groundwater
| Content Provider | Semantic Scholar |
|---|---|
| Author | Flowers, Timothy John |
| Copyright Year | 2010 |
| Abstract | Australia has an abundance of saline groundwater due to land clearing and irrigation within the Murray-Darling river system. Generally saline groundwater contains similar ions to coastal seawater with concentrations varying due to the source of the water. In this study Australian snapper (Pagrus auratus), mulloway (Argyrosomus japonicus) and yellowtail kingfish (Seriola lalandi) were chosen to examine their suitability for culture in saline groundwater. The growth and metabolic response of the aforementioned species were investigated to determine their suitability for culture in saline groundwater from the 'outfall' of the Stockyard Plains Disposal Basin (SPDB) in Waikerie, South Australia (potassium ~ 80 mg.L). In the first experiment snapper, mulloway and yellowtail kingfish were cultured in saline groundwater (salinity = 19 ± 1 g.L), half-strength coastal seawater (iso-osmotic; 19 ± 1 g.L) and oceanic seawater (except snapper; 37 ± 1 g.L) for 61, 45 and 21 days respectively, to determine survival, growth rate and food conversion ratio. At the end of each growth experiment, fish were placed in static box respirometers to record changes in oxygen consumption in the different water types. Changes in oxygen consumption were used as an indirect method to determine routine metabolic rate (Mo2rout), maximum metabolic rate (Mo2max) and metabolic scope (Mo2scope). In the second experiment, blood samples were taken from the fish 1 hour postexhaustion and analysed for blood plasma sodium, potassium, chloride, lactate and osmolality to determine if fish were able to cope with osmoregulatory changes. All three species showed high survival rates and positive growth in saline groundwater and isoosmotic water. Mo2rout and Mo2max of snapper in saline groundwater was 41 % and 29 % greater respectively, than in iso-osmotic seawater. However, there was no significant difference for Mo2scope (p > 0.05) between water types, implying snapper grown in reduced potassium saline groundwater incur a greater metabolic cost compared to fish in iso-osmotic seawater. Mulloway growth and metabolic rate were unaffected by salinity and saline groundwater (p > 0.05). The |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://eprints.utas.edu.au/10404/4/01front.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
