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  1. #1
    Join Date
    Oct 2019
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    Kalahari desert RSA
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    Default Does the moon have an effect on freshwater fish

    We went fishing this weekend and the result was not good,other than a couple of 2kg small mouth yellow during the day nothing else happens, so we tried to go out saturday night, two days before full moon and could only come up with some catfish, no big largemouth yellows was seen feeding or caught. The norm around here is normally three days before and three days after full moon,I know the moon and sun have an effect on the sea but does it really have an effect with fresh water fish.

  2. #2
    Join Date
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    Default Re: Does the moon have an effect on freshwater fish

    According to Arthur Ransome in his book Rod and line, yes it does have an influence,our hill lochs seem to fish better on a rising tide in the sea , easker1

  3. #3
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    Default Re: Does the moon have an effect on freshwater fish

    You say 2 days before a full moon & in that respect, what was the sky like? If totally clear then the air & possibly water temperature could drop quite considerably, which here in South Wales, can make a definite difference in catch rates on rivers, especially at night chasing sea run brown trout. Tactics are usually to scale everything down & fish fine & far off. However, any cloud cover & temperature along with clarity (as in bright moonlight) doesn't have that effect.
    Last edited by taffy1; 11-11-2019 at 10:43 PM. Reason: Info.
    2019 & it will be time for a change.

  4. #4

    Default Re: Does the moon have an effect on freshwater fish

    Anyone remember the old Abu catalogues from the 1970s? They always had a table at the back, with a calendar year that was supposed to tell you which days were going to be good for fishing, which mediocre for fishing, and which poor for fishing... and I guess it was all connected to moon and sun phases. But as to how accurate they were - or if they were any more accurate than a horoscope , no idea?

    Col
    Please note that any views expressed in this post may be those of the
    originator and do not necessarily reflect those of the reader.

  5. #5

    Default Re: Does the moon have an effect on freshwater fish

    There is the solunar theory, it's still used and its predictions are available on Tides and solunar charts for fishing in United Kingdom in 2019

    I take a look at it if I'm fishing the Teifi estuary but 9 times out of 10 the "best time's" when I can't get out... have to admit it's a boost if their prediction coincides with a trip but there are so many other factors - particularly tide, daylight, water clarity, temperature etc. - governing the estuary.



    A good website for info relating to sea fishing and as the pull of the moon affects all waters it may have a bearing on fishing rivers but in my experience of freshwaters it would be way down the list after insect activity, light, wind speed and temperature.

    For migratory fish in freshwaters, hmmmmm, I'd imagine their time at sea made them susceptible to tidal influences, how that translates as they take up residence in the river is open for discussion.

    Solunar theory, here it is -

    The solunar theory was initially proposed by the American John Alden Knight in 1926 and has been supported by the systematic analyses of scientists and biologists in subsequent years.

    It is based on experimental incidents from which it can be deduced that the action of the sun and the moon influences the activity of all living beings in nature. The times of day in which living beings show greater activity are the so-called solunar periods.

    We can distinguish two types of solunar periods:

    Major periods:

    They have approximately 2 hours duration although on certain occasions they may exceed 3 hours. They begin the moment of the lunar transit (when the moon is overhead) and the opposing lunar transit (when the moon is under our feet). Normally these are the moments of greatest fish activity during each day. The most fervent supporters of this theory state that there is not one species of sport fish that cannot be found eating during a major Solunar Period.

    Minor periods:

    They are intermediate periods of lesser duration (approximately 1 hour) which coincide with the rising and the setting of the moon. During these periods there is also an increase in fish activity in relation to the rest of the day.

    The solunar periods appear 4 times every lunar day. Remember that a lunar day lasts 24 hours and 50 minutes approximately so normally within the same day (24h) we will find 2 Major Periods and two Minor Periods.
    We can also observe a notable increase in the activity of fish if the sunrise or sunset takes place during the solunar period. In these cases, in which we may expect more action than that initially forecast, the solunar periods are reflected in green on the solunar chart.

    Musha rig um du rum da

  6. #6
    Join Date
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    Default Re: Does the moon have an effect on freshwater fish

    A bright moon at night seems to effect the fishing, especially off shallow beaches. Otherwise I doubt it. Hard to measure anyway.

  7. #7

    Default Re: Does the moon have an effect on freshwater fish

    Quote Originally Posted by diawl bach View Post
    There is the solunar theory, it's still used and its predictions are available on Tides and solunar charts for fishing in United Kingdom in 2019

    I take a look at it if I'm fishing the Teifi estuary but 9 times out of 10 the "best time's" when I can't get out... have to admit it's a boost if their prediction coincides with a trip but there are so many other factors - particularly tide, daylight, water clarity, temperature etc. - governing the estuary.



    A good website for info relating to sea fishing and as the pull of the moon affects all waters it may have a bearing on fishing rivers but in my experience of freshwaters it would be way down the list after insect activity, light, wind speed and temperature.

    For migratory fish in freshwaters, hmmmmm, I'd imagine their time at sea made them susceptible to tidal influences, how that translates as they take up residence in the river is open for discussion.

    Solunar theory, here it is -
    Certainly see the 'periods of activity' thing when loch fishing for brownies, and for sea trout and salmon - there are times of day when they suddenly switch on - and then they switch-off just as suddenly. Certainly not connected to the appearance of a food supply. I guess it could be the sun and the moon playing a part in it. When fishing a loch for a whole week, it's not uncommon to see the fish 'coming on' at a particular time of day each day. By the middle of the week, you are tuning into the anticipation of it. But then if it were the moon, it should be shifting back an hour each day? We have seen a bit of this, but it might be a red herring... on Loch Roag on South Uist. The high tide reaches the loch and brings in a bit of of salt water. That often acts as an on-switch for the fish already in the loch - and of course it does shift back an hour each day...

    Col
    Please note that any views expressed in this post may be those of the
    originator and do not necessarily reflect those of the reader.

  8. #8
    Join Date
    Oct 2019
    Location
    Hampshire UK
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    184

    Default Re: Does the moon have an effect on freshwater fish

    "As we walked to the river, the old keeper and I, in the chill September twilight, I asked the usual question about the prospect of sport. He answered that if I liked to stay out till ten o'clock I was sure to do well.
    It is such a commonplace among Hampshire fishermen that trout do not rise at night but the keeper quietly reminded me that once a year, at full moon of the harvest moon, trout will rise, and it was that moon tonight."

    J W Hills "A Summer on the Test" 1924

  9. #9
    Join Date
    Oct 2019
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    Kalahari desert RSA
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    Default Re: Does the moon have an effect on freshwater fish

    Quote Originally Posted by taffy1 View Post
    You say 2 days before a full moon & in that respect, what was the sky like? If totally clear then the air & possibly water temperature could drop quite considerably, which here in South Wales, can make a definite difference in catch rates on rivers, especially at night chasing sea run brown trout. Tactics are usually to scale everything down & fish fine & far off. However, any cloud cover & temperature along with clarity (as in bright moonlight) doesn't have that effect.
    The moon was clear in the sky, no cloud no temp drop, the only fish responding, which is not usual was the sharp tooth barbel, problem is, if you are not rigged for them, i.e. heavy gear, you loose your fly and tipped, barbel of 7kg up is not easy to handle on light gear, yet during the day the small mouths responded.

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