In August 2010 we began a new program – gathering data on the fish in Walnut Creek
just below the drop structure near the Willows Shopping Center.
This location is the farthest upstream that steelhead and salmon can
come to spawn. We are attempting to document their success by
sampling several times over the course of a year to see what species
are present in the creek in each season.
We returned to the area a couple of times in December to look
for salmon. We found a few the first time, none the second.
However, there were lots of signs of otters.
In 2012 we sampled fish in Walnut Creek's Civic Park. We
found a mixture of native and non-native species. We measured and
identified each one in the trap before putting it back in the
creek. In addition to the fish, our traps caught crayfish.
We took several samples over a period of six weeks and each time the
size of the sample declined because the resident otters kept eating the
fish. They moved on when the fish population got too low to be
worthwhile. This is the balance of nature.
Creek was our sampling objective in the fall of 2017. We worked
at two locations fairly close to each other and found all native fish
but not a wide variety -- a lot of California roach and a single
three-spined stickleback. There was more native vegetation on the
creek channel than we expected, another happy surprise.
Originally we had hoped to do fish sampling on a regular
basis. Things have not worked out that way, but we do it when we