Test your knowledge

SK60 · Senior Member

Test your knowledge

Bob Loblaw · Senior Member

Need to bust out my copy of An Entirely Synthetic Fish...hold that thought!

SK60 · Senior Member

OK, if you are going to go to the reference books, here's two you may not find there.

11. Bonus: Which is more tolerant of elevated water temperatures, Brown or Rainbow? Of the two, which is known to bury itself in mud to "cool off"?

12. Bonus 2: what's the yearly water temperature range for PC in the IDR?

Cole Davis · Senior Member

Yearly range for the creek is 48-52?

SK60 · Senior Member

Close enough, 49-53 most years

hawkeye · Member

1. Salmo mykizha

2. Yellowfin cutthroat?

4. Pink

kbarn · Veteran Member

Brown's can tolerate higher water temps, and I believe they also bury themselves. I've seen them do this in a spring creek before.

SK60 · Senior Member

1. Discovered in Kamchatka in 1746, latinized eventually to mykiss

2. Correct: found only in Twin Lakes in Colorado

4. Correct

11. Is a bit of a trick question, as either species tolerance is variable depending on water conditions. Popular literature often lists the brown as a bit more tolerant to elevated temperatures.

SK60 · Senior Member

I guess this was too tough

3. It is found in the Sac valley, current closest native population is Alameda Creek in surrounding ponds. Also found in ponds between Gridley and Colusa just north of us.

5. Pike minnow do release a warning pheromone. This was figured out when attempts to eradicate them below the Red Bluff diversion dam on the Sacramento failed. Fish were being electrocuted as they attempted passage to above the dam. An attendant sat in front of a window in the passage and shocked each pike minnow as it came through. Actually worked for awhile, before the fish below got scared off.

6. Even I don't want to answer this one.

7. Ditto

8. Smallmouth are not native to California

9. Water quality isn't good enough(?). Hopefully, this will change with the recent removal of sewage leaks into Berryessa. Still, the sediment in riffles may also prevent them from establishing.

10. 99% of Triploids are sterile, making them attractive for waters that have wild fish. The fertilized eggs are thermally treated during the first mitotic division (chromosome replication) so that segregation (separation) of the chromosomes is incomplete and the embryo continues further divisions with 3 copies of the chromosomes instead of 2. Results in sterility because the triploid adults eggs/sperm don't have the right number of chromosomes and the fertilized eggs are then not viable.