Whew! Where did last week go? I meant to post this days ago.
Last weekend GM and a friend of a friend, Dennis, came to the North Fork Feather to help me collect hardhead and Sacramento pikeminnow for my study. They were a huge help, and caught lots of fish for me. I was a real slacker and didn't take any pictures in the field, but I have a few from the lab.
Hardhead (top) and Sacramento pikeminnow (bottom), showing the differences in headshape and mouth size:
Hardhead (left) and Sacramento pikeminnow (right), showing the difference in "lips". The hardhead "lip" is connected to the "face" by a frenum. The pikeminnow "lip" is folded all the way across the snout:
Anchor worms (
Lernea), in a hardhead (in the pelvic fin and belly).
Lernea are copepods, like sea lice.
Lernea after being removed from fish:
A trematode, showing the attachment hooks:
Thanks again to GM and Dennis for their help!
I really appreciate it!
Dawn
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