期刊
JOURNAL OF FISH BIOLOGY
卷 99, 期 6, 页码 1928-1939出版社
WILEY
DOI: 10.1111/jfb.14899
关键词
fish migration; fish passage; invasive species; native fish; river barriers; river connectivity
资金
- Ministry for Business Innovation and Employment [C01X1002, C01X1615]
- New Zealand Ministry of Business, Innovation & Employment (MBIE) [C01X1615, C01X1002] Funding Source: New Zealand Ministry of Business, Innovation & Employment (MBIE)
This study compared the passage success of native and exotic fish species over an artificial baffled fish ramp, finding that exotic species had lower passage efficiency compared to native species. However, there was significant variation between individual species, indicating the potential for the baffled fish ramps to operate as a selective migration barrier. Further testing is needed to validate these results across a broader range of conditions before deployment.
This study used an experimental approach to compare the passage success of native and exotic fish species from the temperate Southern Hemisphere over an artificial baffled fish ramp designed for overcoming low-head (<= 1.0 m) fish migration barriers. Passage efficiency was, on average, lower for the exotic species [koi carp (Cyprinus carpio), rudd (Scardinius erythrophthalmus) and rainbow trout (Oncorhynchus mykiss)] compared to the native species [inanga (Galaxias maculatus), redfin bully (Gobiomorphus huttoni) and common bully (Gobiomorphus cotidianus)]. Nonetheless, there was considerable variation between individual species, with rainbow trout outperforming common bully and juvenile inanga, but koi carp and rudd failing to pass any of the ramps. The differences in predicted probability of passage success between the native and exotic fish species in this study were sufficient in some cases to indicate the potential for the baffled fish ramps to operate as a selective migration barrier. Nonetheless, further testing is required to validate these results across a broader range of conditions before deployment.
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