Publication
Title
Facilitating upstream passage of small-bodied fishes : linking the thermal dependence of swimming ability to culvert design
Author
Abstract
Fish passage through road culverts is poorly understood, particularly for small-bodied fishes, despite this information being integral to the restoration of waterway connectivity. We assessed the prolonged swimming performance of a small-bodied fish, empire gudgeon (Hypseleotris compressa; 3.27.7 cm total length, TL), and juvenile Australian bass (Percalates novemaculeata; 3.57.8 cm TL). Swimming trials were conducted in a hydraulic flume across a range of fixed and increasing velocities in response to acute and long-term thermal treatments. A new statistical approach (Tobit analysis) was used to relate the thermal dependence of swimming endurance to hydraulic characteristics of culverts, providing estimates of maximum water velocity allowing upstream fish passage. Reductions in water temperature of 10°C, similar to those caused by cold-water releases from dams, significantly impaired critical swimming speeds of both species. Traversable water-velocity models identified H. compressa as a weak swimmer, requiring very low water velocities (≤0.10 m s1 or 2.86 body lengths (BL) s1) for unrestricted passage, whereas P. novemaculeata was predicted to traverse water velocities of ≤0.39 m s1 or 12.12 BL s1. Culvert designs can be improved by limiting water velocities to accommodate weak-swimming fishes and by accounting for the thermal sensitivity of swimming performance.
Language
English
Source (journal)
Marine and freshwater research. - Melbourne
Marine and freshwater research. - Melbourne
Publication
Melbourne : 2014
ISSN
1323-1650
Volume/pages
65 :8 (2014) , p. 710-719
ISI
000344380200005
Full text (Publisher's DOI)
Full text (publisher's version - intranet only)
UAntwerpen
Publication type
Subject
External links
Web of Science
Record
Identification
Creation 15.10.2018
Last edited 19.09.2021