Re: NANFA-- Pike could devastate fisheries (article)

Jay DeLong (
Sat, 08 Feb 2003 10:06:28 -0800

At 10:09 AM 2/8/2003 -0600, you wrote:
>Isn't the primary diet of trout and other salmonoids, other fish?

Not necessarily. The Salvelinus species (lake trout, bull trout, dolly
varden) are fish-eaters. Onchorhynchus species are
different. Invertebrates (aquatic and terrestrial) are important to the
diets of rainbow and cutthroat trout in streams in their native ranges,
even though they'll feed on fishes like sculpins and sticklebacks. Adult
salmon don't eat fish in freshwater, except where they are landlocked (like
the Great Lakes). Some Onchorynchus aren't fish eaters even in marine
waters; in spite of the sizes they attain, their diets are plankton and
squid and similar animals. (...and in spite of their appearances. See for something I picked up
streamside last week. It's part of the upper jaw of a male chum salmon-- a
large species which is a filter feeder. It's about 2 x scale).

Jay DeLong
Olympia, WA
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