Journal
NEW ZEALAND JOURNAL OF MARINE AND FRESHWATER RESEARCH
Volume 47, Issue 2, Pages 225-234Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00288330.2013.773918
Keywords
freshwater fish; floods; behaviour; PIT tags; habitat use
Categories
Funding
- Department of Conservation
- Whanganui River Enhancement Trust
- family of the late Julie Alley
- Greater Wellington Regional Council
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Floods are an integral part of flowing river systems, yet our understanding of freshwater fish behaviour during floods is limited. In 2008, 67 redfin bullies (Gobiomorphus huttoni), 22 shortjaw kkopu (Galaxias postvectis) and 29 karo (Galaxias brevipinnis) were tagged with passive integrated transponder (PIT) tags and monitored in a 100-m study reach before, during or after three floods. Detection patterns of tagged fish indicated that they may be displaced or may move to areas with large substrates during floods. Two individuals returned to the same locations during multiple floods, suggesting that previous experience may influence refuge selection for some individuals. While small changes in community composition occurred that could be attributed to concurrent habitat changes, overall a remarkable level of persistence of individual fish was observed in the tagged community.
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