NDLI: Fish health changes in Lake Okaro, New Zealand: effects of nutrient remediation, season or eutrophication?

Content Provider	Springer Nature Link
Author	Landman, Michael J. Ling, Nicholas
Copyright Year	2010
Abstract	The purpose of this investigation was to measure the in situ health of selected biota with respect to a large-scale application of an aluminium-amended zeolite (Z2G1) in Lake Okaro, New Zealand. We hypothesized that, based on previous laboratory toxicity testing, the Z2G1 application would have minimal or no significant health effects on lake fauna. To test this hypothesis, two sampling events were timed around the Z2G1 application to examine the health of two finfish species (Oncorhynchus mykiss and Gobiomorphus cotidianus) and crayfish (Paranephrops planifrons). Additionally, the same species were sampled from the neighbouring Lake Rerewhakaaitu in order to delineate seasonal and lake-specific effects. A general lack of aluminium accumulation in animal tissues following the application indicated that Z2G1-derived aluminium was not readily bioavailable. An unexplained osmoregulatory disturbance, indicated by increased blood plasma ion concentrations in Lake Okaro trout, was observed following the application, but could not be directly attributed to Z2G1 exposure. Changes in fish haematology over time and between lake populations were interpreted as physiological responses to seasonal changes in lake conditions. Using a broad range of specific and non-specific endpoints it was concluded that there were no obvious negative impacts on fish health resulting from Z2G1 exposure.
Starting Page	65
Ending Page	79
Page Count	15
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	661
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-06-26
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Eutrophication Lake restoration Zeolite Aluminium Fish health Zoology Ecology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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