Electrofishing

Discussion in 'The Sump' started by 2balive, 9 Mar 2012.

  1. 2balive

    2balive

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    Came across this sign at lake in a park in London.

    • Any ideas what it is/they doing?
    • Will it work on my hitch hiker crab?

    [​IMG]
     
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  3. crispin

    crispin

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    its normally a method of passing current through the water which either shocks fish or makes them jump and thus can be removed. Its used quite alot in the states to clear water ways of invasives such as carp.
     
  4. crispin

    crispin

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    this will explain it a little better for u
     
    Last edited by a moderator: 11 Apr 2016
  5. crispin

    crispin

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    here's one showing carp reacting to the electric current in the water...

     
    Last edited by a moderator: 11 Apr 2016
  6. belindamotion

    belindamotion Google Master

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    Is that not considered cruel by Animal Rights Activites or just plain cruel in General...?
     
  7. seank

    seank

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    nope, as they can be revived without ill effect, whereas with a hook and line, you tire the fish, and the hook adds injury, and less stress to the fish with the electro method
     
  8. Steve Warren

    Steve Warren

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    It's a method used in FW for research purposes and removing alien invasive species. After stunning the fish the unwanted species are removed and the desirable species left to recover or placed in containers to recover before being returned. It does not work in SW.
     
    Last edited: 9 Mar 2012
  9. leslie hempel

    leslie hempel Moderator MASA Contributor

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    interesting

    i heard of something simular for saltwater in a lecture i attended with richard stark and lex furnhead, but cant remember the whole story, but aparently it would really be unfair advantage if it were to be implemented commercially..
     
  10. 2balive

    2balive Thread Starter

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    Don't think I approve of it, a bit like tasering your fish, but it would be a great way of catching those wrasses that you should not have put in the tank in the first place.:whistling:
     
  11. seank

    seank

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    Interesting
     
  12. Nemos Janitor

    Nemos Janitor

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    Why? I would have thought the electricity wound have conducted better in salt water. Mind you the guy in the boat may get a surprise if he trys. :eek:

    Well cyanide or electro fishing on reefs is a big no no IMO. Will lead to a huge outcry.
     
    Last edited: 11 Mar 2012
  13. belindamotion

    belindamotion Google Master

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    My point exactly..by allowing electro fishing now...doesn't that just pave the way for future scenarious..?...:blush:
     
  14. lIghty

    lIghty

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    I think thats why it doesn't work?


    To get shocked you need to have a potential (voltage) difference across your body or a part of it. In fresh water current is not conducted easily, so when it gets to a fish (or person) which contains much better "conducting salts", the current then rather passes through it, but when it comes to SW, since it contains higher levels of salts, which allows the current to pass through it more easily than the fish or body.


    A simple example: (hypothetical)


    Lets say a 100V can travel for 10 meter in FW until the voltage is reduce down to 0V, therefore if a 1m fish swims between these 2 points it will have a 10V potential difference across it nose to tail. (100/10*1=10)


    Now lets say 100V can travel for 50 meters in SW, therefore the same size fish would only experience a 2V potential difference (100/50*1).

    Well thats my theory :whistling:


    Reminds me of a story about some guys that were working on high voltage line, the line came down very close to them, all the guys that ran got electricuted, while the guys that hopped (with feet together) away survived. :eek:
     
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