Originally Posted by Jay
Not to try and discredit anyone but what are these opinions based on?
Well, I will be honest. It is based on a combination of direct observation
and assimilation of a lot of second hand
For direct observation, we have the fact that all (or nearly all) trout will run given the opportunity
. Laketrout may provide an exception to this basic rule. Rainbow trout however do not. I have observed a great many trout fry in streams and rivers, but very few in littoral zones of stillwaters.
Parr, yes. But fry, no. Where are the dense clouds of fry indicating a successful spawn?
There are a great many papers written by ichthyologists concerning the failure of reproduction of various species of trout in reservoirs. There is some reproduction, but the ultimate dictator of spawning success is adequate spawning grounds, which tend to be lacking in reservoirs.
Reservoirs experience a very rapid eutrophication process in comparison to a typical natural lake. Eutrophication is the process of "aging" that takes place in a lake. Over the huge spans of time that a natural lake ages (sometimes hundreds of thousands or even millions of years) there are species that take advantage of the niches that are available. Stocks of fish will return to a single area over and over for countless generations. (Man has made note of this, to the detriment of many fish stocks.)
In a man made reservoir, this is not the case. That is not to say that there will be no spawning behavior, it is genetically hard-wired in the DNA of species. (I had a perch lay eggs in my aquarium once!) The better the spawning habitat the better a given spawn will come off. But without the conditions that these species evolved with, it is likely that the spawning ritual is only so much wasted effort.
In an effort to placate haters, I will freely admit I am a hack in pretty much every sense of the word.
I think FishDr. could render a useful perspective on the matter, as could John Ewert. Dr. Robert Benhke (not sure if I got the spelling right there) at CSU is internationally renown for his knowledge on trout. I am sure his input would be of great worth as well to anyone willing to invest the effort to contact him on the matter.