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#504962 - 04/28/19 12:29 AM Young YP..Is this possible???
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
Got 3 of these today in a "Z" trap just checking things out..
Can someone give some insight as to growth rates of new hatch??
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#504963 - 04/28/19 01:03 AM Re: Young YP..Is this possible??? [Re: Snipe]
teehjaeh57 Offline
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Registered: 01/22/08
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Hmmm...what size, Kenny?
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#504968 - 04/28/19 10:12 AM Re: Young YP..Is this possible??? [Re: Snipe]
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
Smallest of the 3 at 2-3/16", largest 3-1/16"..
There is no other possible explanation, I've hand-sorted every fish that's been put here.
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#504969 - 04/28/19 01:29 PM Re: Young YP..Is this possible??? [Re: Snipe]
Bill Cody Offline
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For new crop 2019 yellow perch very good growth is 1 mm/day. Exceptional unheard of YP growth would be 2mm/day. Exceptional growth of trout fry can be 3.9mm/day. However in early spring in KS the water temperature would be 50-60F thus YP growth would be expected to be less than optimal at best 0.8 to 1.0mm/day which equates to Mar 26 hatch + 30 days on April 28 = 1.1" size. I think somehow this is a perch from the 2018 year class.
I commonly see YP this small in the spring from the previous year's hatch. Note a very few exceptional growing individuals from that year class could be 8.5" as 8 months (240days) growing season (50F+) calculates to 0.89mm/day.


Edited by Bill Cody (04/28/19 01:33 PM)
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#504970 - 04/28/19 03:41 PM Re: Young YP..Is this possible??? [Re: Snipe]
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
I'm perplexed..
July 21, 2018 I stocked 26 YP from 91-113mm
9 YP from 122-154mm,
The only other YP stocking besides the giants I put in (13 now)was the 161 fish I pulled from tank to bucket, measuring a couple in every net to get an average, which was just over the 8" mark at 204mm. The smallest fish I could find in that 161 was 134mm.
The smallest fish here in the trap was 56mm, a LOT smaller than anything I stocked, even the 2 bigger ones were 77mm, still smaller than anything I put in.
Had to be some stealthy suckers to get by me..
I guess that's how it happens but I feel I've been trained to do better than that. It's not acceptable to me to be that careless but I have no other explanation..??..


Edited by Snipe (04/28/19 03:43 PM)
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#504971 - 04/28/19 04:02 PM Re: Young YP..Is this possible??? [Re: Snipe]
Bill D. Online   content


Registered: 10/19/14
Posts: 6056
Loc: Boone County Illinois
Is it possible you had a an early spawn in Feb 2019 that you missed seeing?
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#504972 - 04/28/19 04:11 PM Re: Young YP..Is this possible??? [Re: Snipe]
RAH Offline
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Registered: 05/17/09
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Loc: Indiana, Boone County, 25 mile...
Just a non-scientific observation: Added YP and just 12 LCS to pond and worried none had survived. Currently have young of both species washing out drain pipe.

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#504973 - 04/28/19 04:18 PM Re: Young YP..Is this possible??? [Re: Bill D.]
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
Originally Posted By: Bill D.
Is it possible you had a an early spawn in Feb 2019 that you missed seeing?

I had ice until almost the 20th of March.. I have no idea what happened under the ice but only seen 2 ribbons in late March.
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#504974 - 04/28/19 07:03 PM Re: Young YP..Is this possible??? [Re: Bill Cody]
Theo Gallus Offline
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Registered: 05/14/04
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Loc: Central Ohio
Originally Posted By: Bill Cody
For new crop 2019 yellow perch very good growth is 1 mm/day. Exceptional unheard of YP growth would be 2mm/day. Exceptional growth of trout fry can be 3.9mm/day. However in early spring in KS the water temperature would be 50-60F thus YP growth would be expected to be less than optimal at best 0.8 to 1.0mm/day which equates to Mar 26 hatch + 30 days on April 28 = 1.1" size. I think somehow this is a perch from the 2018 year class.
I commonly see YP this small in the spring from the previous year's hatch. Note a very few exceptional growing individuals from that year class could be 8.5" as 8 months (240days) growing season (50F+) calculates to 0.89mm/day.

I am convinced Bill Cody expertly manages ponds with a micrometer and a 0.01 Grain accurate scale.
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#504975 - 04/28/19 08:14 PM Re: Young YP..Is this possible??? [Re: Snipe]
Bill Cody Offline
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Registered: 04/18/02
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Loc: Northwest Ohio - Malinta OH
For your 3 small perch; 56mm/30days = 1.8mm/day and 77mm/30days = 2.5mm/day. Ice off Mar 20. If eggs were laid under the ice in 39F water (laid on March 15-20 temperature water it will take close to 12-14 days to hatch that puts it at March 27-30. When eggs hatch at around 46F, it takes at least 2-3 days for them to begin swimming. Small perch were captured April 27th - 27days. IMO it is not feasable for them to grow 2.5+mm/day in early spring temperatures to grow to 77mm by April 27. Maybe you have a super strain of yellow perch; if so fishery science should hear about it.


Edited by Bill Cody (04/28/19 08:16 PM)
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#504980 - 04/28/19 10:10 PM Re: Young YP..Is this possible??? [Re: Snipe]
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
I guess what may answer my question is see how many I can trap.
I am human and no doubt could have missed a few tiny ones but if I catch many more I may have other questions.
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#504985 - 04/29/19 12:06 AM Re: Young YP..Is this possible??? [Re: Snipe]
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
Maybe you have a super strain of yellow perch; if so fishery science should hear about it.

All joking aside, this would explain some other things although I seriously doubt that's the case..
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#504986 - 04/29/19 12:41 AM Re: Young YP..Is this possible??? [Re: Snipe]
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
This is pic of original stock size in July, last summer..
Just to compare.


And yesterday's..



Edited by Snipe (04/29/19 12:43 AM)
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#504993 - 04/29/19 10:29 AM Re: Young YP..Is this possible??? [Re: Snipe]
Bill Cody Offline
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Registered: 04/18/02
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That picture of the stocker perch shows it had a full belly; maybe fat, maybe it just ate a small fish, or it had eggs. Eggs in July for YP is the least likely of the three choices. However if the perch were raised in cold water plus the fact that year one perch are usually late to spawn, it is possible, not likely, that a few of the stocker perch had a late spawn last year. If I would see that same stocker perch in prespawn, I would definitely consider it a gravid female. Never say never.


Edited by Bill Cody (04/29/19 10:33 AM)
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#505021 - 04/29/19 06:42 PM Re: Young YP..Is this possible??? [Re: Snipe]
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
Thanks for sharing the info on expected growth rates, extremely helpful as a std to gauge by.
Appreciate your help greatly!
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#505322 - 05/04/19 02:09 PM Re: Young YP..Is this possible??? [Re: Snipe]
teehjaeh57 Offline
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I can't wait to find out how this ends up - Kenny can you take some photos showing us the urogenital opening of some of these mystery fish? I don't know if we'll be able to verify gender, but females should have a crescent shape, males a round, pore shape. This may allow us some more data to hypothesize.
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#505324 - 05/04/19 02:48 PM Re: Young YP..Is this possible??? [Re: Snipe]
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
I've got 6 in the aquarium now.. when I get them a tad bigger to pull otoliths I will get some pics at that point.
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#505341 - 05/04/19 09:43 PM Re: Young YP..Is this possible??? [Re: Snipe]
Bill Cody Offline
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Registered: 04/18/02
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Loc: Northwest Ohio - Malinta OH
YP at 4"-5" will be extremely hard for any of us to determine male or female with any certainty.


Edited by Bill Cody (05/05/19 09:49 PM)
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#505342 - 05/04/19 10:50 PM Re: Young YP..Is this possible??? [Re: Snipe]
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
If I'm extracting Otolith, I should be able to do Ovary check..I "think".
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#505441 - 05/07/19 01:26 PM Re: Young YP..Is this possible??? [Re: Snipe]
ewest Offline
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Registered: 03/08/05
Posts: 20016
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My guess is late hatch last year. Even trained FS experts make mistakes in stocking. In addition newly stocked fish in an unfull pond try to reproduce to fill it up with their kind.
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#505550 - 05/09/19 09:38 AM Re: Young YP..Is this possible??? [Re: ewest]
DonoBBD Offline


Registered: 06/13/12
Posts: 1993
Loc: Ontario, Canada, Eh.
Originally Posted By: ewest
My guess is late hatch last year. Even trained FS experts make mistakes in stocking. In addition newly stocked fish in an unfull pond try to reproduce to fill it up with their kind.


Right there with you ewest. Late fall hatch. I have had young perch hold onto their eggs and you would think they would absorb them back but may lay them late fall.

If I was a betting man I would be betting a late fall hatch.

Cheers Don.
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#505553 - 05/09/19 10:27 AM Re: Young YP..Is this possible??? [Re: Snipe]
Snipe Offline


Registered: 10/26/18
Posts: 761
Loc: NW Kansas
You may both be right. Another 7-10 days these guys in aquarium will be big enough to extract otolith and we'll know for sure.
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#505594 - 05/09/19 02:46 PM Re: Young YP..Is this possible??? [Re: Snipe]
teehjaeh57 Offline
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Registered: 01/22/08
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I've never heard of a fall YP spawn [Cody has never discussed it to my knowledge], if that's the case, this could be a significant scientific discovery.
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#505596 - 05/09/19 03:04 PM Re: Young YP..Is this possible??? [Re: Snipe]
Bill D. Online   content


Registered: 10/19/14
Posts: 6056
Loc: Boone County Illinois
I'll remain the outcast and stick with they came from an early 2019 spawn (maybe even under the ice).


Edited by Bill D. (05/10/19 07:24 AM)
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#505621 - 05/09/19 07:30 PM Re: Young YP..Is this possible??? [Re: Snipe]
Bill Cody Offline
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Registered: 04/18/02
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Loc: Northwest Ohio - Malinta OH
When these unknown age yellow perch are being grown in the aquarium what are your feeding them? Any idea what their growth rate is as you are holding them>
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