Register now on PaFlyFish.com! Login
HOME FORUM BLOG PHOTOS LINKS


Sponsors

Browsing this Thread:   1 Anonymous Users





Stocked fish and parr marks.

Joined:
2007/4/8 20:43
From Lehigh Valley
Posts: 11190
Offline
Do stocked fish exhibit parr marks?

If not, why not?

Would a stocked fingerling, or small enough fish, develop them if no stocked fish do?

I picked up rainbow today in a place where I know they don't reproduce on which fading, but present, parr marks. I was under the impression that stockies don't develop them, so my whole world's been turned over.

Click to see original Image in a new window


Click to see original Image in a new window


'Splain how!

Posted on: 2010/6/2 15:54


Re: Stocked fish and parr marks.

Joined:
2006/9/10 21:53
From Greensburg, PA
Posts: 13614
Offline
All juvenile salmonids exibit parr marks. After the fry absorb the yolk sac, they begin feeding on plankton. As the fish grow , they develop parr marks on their sides. At this stage, the fish are called parr. Rainbow trout lose their parr marks as they mature. We associate parr marks with wild fish because most trout when stocked have already lost them so if we see a fish with them we assume it must have been bred in the stream. Fingerlings that are stocked could be in either a stage of still having parr marks or already having lost them. Most, I assume,would still have them. That's my story and I'm sticking to it.

Posted on: 2010/6/2 16:20


Re: Stocked fish and parr marks.

Joined:
2008/1/31 17:19
From Pretty much everywhere at some point, Thorndale today.
Posts: 12923
Offline
Yes, stocked fish have parr marks.

All trout have them when young, and lose them at a certain maturity level. Obviously maturity has something to do with age, but its not just age, its heredity, size, diet, etc. Most of our adult stocked trout have lost or largely faded their parr marks before they are stocked. Fingerlings still have them, and even the smaller adults often show some parr mark remnants. Likewise, large wild fish often don't have them.

Posted on: 2010/6/2 16:36


Re: Stocked fish and parr marks.

Joined:
2007/4/8 20:43
From Lehigh Valley
Posts: 11190
Offline
Fair enough, at some point it had entered my memory that stocked fish didn't exhibit parr marks, and I never bothered to compute on it any further.

I just had the assumption it had to do with diet (and a lack of key vitamins/etc in the trout kibble), but figured I'd ask.

Posted on: 2010/6/2 17:12
_________________
April 8, 2007 - December 4, 2011.
And why not?


Re: Stocked fish and parr marks.
Moderator
Joined:
2006/9/9 17:32
From Gettysburg
Posts: 8667
Offline
What Tom and Pcray said.

Posted on: 2010/6/2 19:04






You can view topic.
You cannot start a new topic.
You cannot reply to posts.
You cannot edit your posts.
You cannot delete your posts.
You cannot add new polls.
You cannot vote in polls.
You cannot attach files to posts.
You cannot post without approval.

[Advanced Search]





Site Content
Login
Username:

Password:

Remember me



Lost Password?

Register now!
Stay Connected

twitterfeed.com facebook instagram RSS Feed

Sponsors
Polls
What kind of streams do you primarily fish?
Approved Trout Waters (Stocked Fish)
Class A Wild Trout Streams
Special Regulation Areas
Wilderness Trout Streams
No Preference All Trout Streams
108 total votes!
The poll will close at 2014/4/30 15:00
3 Comments
USGS Water Levels





Copyright 2014 by PaFlyFish.com | Privacy Policy| Provided by Kile Media Group | Design by 7dana.com