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  1. #101
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    Nov 2007
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    Isle of Lewis
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    Quote Originally Posted by Colin M View Post
    I doubt it very much Roag fisher, the loch was first used for abstraction in 1971 (50+ years ago) when the barrage was built so surely any effect related to that would have been evident long before now.
    The regime for raising and lowering the gates has been tampered with over the years and we always worry that after a spell of low water when a flood does come and the gates are not opened to give a freshet that our fish may well elect to run one of the other rivers that is experiencing a natural spate - in fact we are currently experiencing just such an extended period of low water.

    Colin
    A lot of the rearing of surplus (to the spawning burns) juveniles takes place in lochs. It takes time for sediment to build up on the bottom of the loch to a point where the food chain gets altered, possibly in a negative way to juvenile salmonids. That point may well have been reached.

  2. #102
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    Nov 2017
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    Scotland
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    84

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    Quote Originally Posted by Roag Fisher View Post
    A lot of the rearing of surplus (to the spawning burns) juveniles takes place in lochs. It takes time for sediment to build up on the bottom of the loch to a point where the food chain gets altered, possibly in a negative way to juvenile salmonids. That point may well have been reached.
    I may well be wrong but like you say that sort of thing takes time but what we are seeing is a significant drop in number over a very short period of three years
    No solution fits all!!

  3. #103

    Default Dismiss nowt

    I would dismiss nothing from the argument. But your argument is more likely to involve predation on those dropping juveniles IMO. Below is the alien species argument, just found one near me:

    " Alien invasive species have a great edge over native species, be they plant or animal, largely because the invasive or introduced species generally arrives in a new land without its predators, pests and diseases in tow. They have an unfair advantage over native species which have an extensive array of things that like to eat or kill them that have evolved in place with the natives. "

    This is my alien; what the hell is this: a dandelion or Whickham Grass ? And why won't the pic load in the correct orientation please ?

    Quote Originally Posted by Roag Fisher View Post
    A lot of the rearing of surplus (to the spawning burns) juveniles takes place in lochs. It takes time for sediment to build up on the bottom of the loch to a point where the food chain gets altered, possibly in a negative way to juvenile salmonids. That point may well have been reached.
    Attached Images Attached Images fullsizeoutput_d-jpeg 
    Last edited by Dave Wilkinson; 10-07-2018 at 12:54 PM.

  4. #104
    Join Date
    Nov 2009
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    In a cooling North Atlantic...
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    1,053

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    Quote Originally Posted by Dave Wilkinson View Post
    I would dismiss nothing from the argument. But your argument is more likely to involve predation on those dropping juveniles IMO. Below is the alien species argument, just found one near me:

    " Alien invasive species have a great edge over native species, be they plant or animal, largely because the invasive or introduced species generally arrives in a new land without its predators, pests and diseases in tow. They have an unfair advantage over native species which have an extensive array of things that like to eat or kill them that have evolved in place with the natives. "

    This is my alien; what the hell is this: a dandelion or Whickham Grass ? And why won't the pic load in the correct orientation please ?
    It's a spiralised dandelion seedhead so not entirely ironic.

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