I think there is something in it Terry. Many years ago, Ray Webb and Barrie Rickards did a great deal of study on the effects of moon phases and barometric pressure on the feeding of pike. The results of their work is recorded in the classic book "Fishing for Big Pike". This is a book by the way that any keen pike anglers should not be without.
Again, many years ago myself, and several friends did a bit of work on the correlation beween barometric pressure and weather fronts in connection with the feeding of large mouth bass.
In the USA, a great deal of work as been done in this field. Basically, with reference to predatory fish, they tend to stop feeding when a weather front crosses the country.
In other words, a sudden change in barometric pressure, be it upwards or downwards can have a dramatic effect on a fishes feeding pattern.
I could write a large article on this subject, but on this note, over to others. What have been your experiences?