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Nutrient and nitrogen isotope monitoring of an aquaculture fishery in North Queensland, Australia

journal contribution
posted on 06.12.2017, 00:00 by Kevin Wormington, S McBride
A one-time monitoring event was initiated by an aquaculture fishery in North Queensland to assess if the discharges from the aquaculture fishery were increasing nutrient input into the Great Barrier Reef Marine Park. Leaf samples from Avicennia marina (grey mangrove) were used to compare the nitrogen (N) and phosphorous (P) concentrations, and δ 15N values in the receiving waters of the adjacent creeks and a set of reference sites established in a neighbouring creek. The same indicators were also measured in macroalgae from the nutrient extraction ponds. The mangrove leaves in the Mixing Zone of the receiving creek were slightly elevated in N concentrations (22 mg g -1 compared to 17.5 mg g -1 at the Reference sites) and δ 15N values (6.5 compared to 4.5 at the Reference sites) showing there was an influence from the outputs of the aquaculture fishery. However, P concentrations were the same in the Mixing Zone and Reference sites. Downstream of the Mixing Zone, the concentration of N and P, and the δ 15N values in the Receiving Waters were the same as the Reference sites, at levels considered normal in other studies. These results show that aquaculture fisheries can be managed to maintain nutrients at reference levels in mangrove foliage in estuaries of the receiving zones.

History

Volume

43

Issue

11

Start Page

1710

End Page

1718

Number of Pages

9

eISSN

1365-2109

ISSN

1355-557X

Location

London

Publisher

Blackwell

Language

en-aus

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Centre for Environmental Management; Good Fortune Bay Fisheries; Institute for Resource Industries and Sustainability (IRIS);

Era Eligible

Yes

Journal

Aquaculture research.

Exports

CQUniversity

Exports