https://padlet.com/vjenkins11/g7g2adib35ki Please explore the information below regarding fish counters and their application. Feel free to comment on or like any of the content. en-us 2019-03-02 03:07:56 UTC 2026-01-12 17:48:52 UTC hello@padlet.com vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081024 2019-03-02 03:08:05 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081024 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081110 Fish counters are used to estimate fish population sizes and dynamics without needing to capture the fish. The device is placed in a stream/river and as the fish swim past, the device senses their movement. (Casselman et al., 1990; Baumgartner et al., 2010) The device can also capture other information including upstream or downstream direction, body depth, and silhouette image (Shardlow and Hyatt. 2004).]]> 2019-03-02 03:09:31 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081110 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081135 fish counters are often used to assess the impact of man-made barriers on the local fish stock (typically salmon or trout). See the attached video to view the application of a fish counter to a migration ladder.  ]]> 2019-03-02 03:10:01 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081135 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081189 2019-03-02 03:11:04 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081189 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081204 - Does not disrupt the natural behaviors of the fish 
- Data can be collected from more inaccessible locations
- Requires less people
(Lucas and Baras, 2000)]]> 2019-03-02 03:11:18 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081204 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081209 - Many other fish stock monitoring tools are capture dependent. 
- While those methods provide more information, they disrupt the fish' natural behavior and many cause stress.
(Lucas and Baras, 2000)]]> 2019-03-02 03:11:24 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081209 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081235 2019-03-02 03:11:57 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081235 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081236 - Expensive 
- Must be associated with a suitable in-river structure 
- Require regular monitoring
(Eatherley, et al., 2005)]]> 2019-03-02 03:12:00 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081236 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081237 - Can only be used for small populations sizes, which is why they are used less frequently in North America (Eatherley, et al., 2005). 
- Less accurate when counting fish at higher migration rates. Only 76% accurate at rates exceeding 1,500 fish/h (Shardlow and Hyatt. 2004).
- Some versions do not work in areas with high turbidity or salinity (Baumgartner et al., 2010) ]]> 2019-03-02 03:12:02 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081237 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081276 Although fish counters are not suited for citizen science, the data that they collect can be valuable for my students as I work to inspire civic engagement and stewardship.  ]]> 2019-03-02 03:12:56 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337081276 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337165482 Sense the change in electrical resistance of the surrounding water (Lucas and Baras, 2000) ]]> 2019-03-02 23:15:58 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337165482 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337248425 Uses principals of sonar (Casselman et al., 1990).]]> 2019-03-03 17:33:13 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337248425 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337248486 Uses light beams that are disrupted as the fish pass though them. (Thorley et al., 2005)]]> 2019-03-03 17:33:49 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337248486 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337298590 As of 2005 there were 29 fish counters in use in Scotland to assess the impacts of human made structures on native salmon stock and migration (Eatherley, et al., 2005). The counters are embedded in river structures such as weirs or fish ladders. ]]> 2019-03-04 00:09:18 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337298590 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337315473 - Many errors can occur including missed counts, false counts, mixed counts, and multiple counts (Eatherley, et al., 2005). 
-When two fish enter at the same time it only recognizes them as one fish.
- There has been documentation of fish avoiding the structure and changing behavior, which may skew the data (Baumgartner et al., 2010).  ]]> 2019-03-04 01:57:16 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337315473 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337319975 - Evaluating migration of fish over man-made structures such as fish ladders or weirs.
- Allows for the assessment of these conservation practices.
-  Quantifying migration patterns of salmon and trout  
(Lucas and Baras, 2000)]]> 2019-03-04 02:27:55 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337319975 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337320947 See attached document for literature cited]]> 2019-03-04 02:35:25 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337320947 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337321931 The Tweed River provides 15% of Scotland's freshwater Atlantic salmon habitat. Automatic fish counters were installed on existing in-river structures to assess the abundance of Atlantic Salmon in the system. Data collected inspired a catch-and-release program, revealed interesting behavioral patterns, and helped obtain emergency releases of reservoir water. (Eatherley, et al., 2005)]]> 2019-03-04 02:42:50 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337321931 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337323610 2019-03-04 02:53:46 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337323610 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337328000 Example of a fish ladder in Scotland with various automatic fish counters(Eatherley, et al., 2005).]]> 2019-03-04 03:21:02 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337328000 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337328985 One of my units in marine biology is continental shelf ecology. We use the event below (released Atlantic salmon into native Pacific salmon fish stock) as our driving phenomena. I can have my student work with the data collected from the fish counters to see the impacts of the nonnative population on the native ecosystem. ]]> 2019-03-04 03:26:16 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337328985 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337330292 The estuaries and tidal rivers in the town I teach are in the process of being restored. Fish counters could be used in the areas to assess the improvements made by the restoration. (Salt Marsh Restoration Program, n.d)]]> 2019-03-04 03:33:25 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337330292 vjenkins11 https://padlet.com/vjenkins11/g7g2adib35ki/wish/337333784 2019-03-04 03:52:35 UTC https://padlet.com/vjenkins11/g7g2adib35ki/wish/337333784