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Thread: Fish Trends/ females vs jacks
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03-04-2014, 09:56 AM #18
They use calculations from trawling/ netting and use that information to determine by using formulas to estimate current populations. I at this time can no longer access the web pages due to a failure of a flash drive that had most of my info stored. But I do have a couple of pictures that I copied to file on a different devise and will post them while I continue to search for the web pages they came from.
Here is a table that shows what the bag limit will be if the Ohio Quota drops below a certain level. This is already in effect and will happen automatically if any of these numbers are realized.
Here is the graph that shows the number of harvestable walleyes at least 15in long that I used to determine the numbers I used, and as you can see my numbers were on the conservative side. Please note that on almost all of the larger increases of population that the number of adult walleyes was very low at least 2 years prior to the increase. In other words the spawn that was responsible for the increase happened at least 2 years before the increase was noted on the graph, as it takes at least 2 years for a walleye to attain the length of 15 inches required for it to be included in the graph as harvestable size.
Attachment 1334
I will continue to look for the source of my information and will either post it here or send it to you by PM.
It seems the graph is located in the link that I had posted earlier and I have reposted below.
http://www.epa.gov/med/grosseile_sit...s/walleye.html
Please note the date of April 17, 2003 that John Hageman is referring to in the Quote from and provided in the attached link posted below;
John Hageman
Extension Agent
*
Posts: 179
Re: The 4-17 Blow ... (April 17, 2003)
( Reply #1 on: 11/10/05, 12:17 )
Reply with quote
According to some of the posts on walleye central, at least some of the females are spawned out. Speaking with Jeff Tyson of the Div. of Wildlife's research station on Lake Erie at Sandusky, he expects that the bigger fish have mostly spawned, and the smaller ones may be done soon too. But all is not necessarily lost from one day of wind, despite the intensity. Jeff cites a recent larval fish study (Ed Roseman,Michigan State Univ.)indicating that even when the eggs roll off the initial location on a reef where they were deposited, they could still remain viable as long as they didn't go all of the way into the mud where they would likely fungus over. A sustained wind of several days would have had a worse impact. Also, remember that more eggs doesn't necessarily mean more fish. At times less is better, because each fish has less intraspecific completion for food and may have better survival odds. So, all hope for a good spawn is not yet lost!
http://ohioseagrant.osu.edu/discuss/...n.html#msg1644Last edited by wakina; 03-04-2014 at 10:41 AM.
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