Karl posted a link to the new web page and lake data that is now available. I was particularly interested in the Saugeye data and most interested in Rocky Fork ( my home lake). Here is a link to Rocky Fork's data: https://ohiodnr.gov/static/documents/wildlife/fishing-forecasts-reports/d5/lakes/Rocky Fork Lake Saugeye Survey up20.pdf
I actually went through all the regions and compared the data sets. First I must say I am disappointed in the variances between what the different districts have posted and wonder if it is a reflection of work done or just a failure to report. After looking at the survey data for Saugeye I will offer my thoughts.
First only district 4 offered any electrofishing young of year data (that I noticed) and the rest posted gill net surveys for larger fish. I'd be interested in initial yoy survival too. when I look at the charts for gill net surveys, two things jump out: 1) Growth rates are much higher than I expected (i will recant and accept I was wrong in previous post on growth rates) 2.) That very few fish are living past 3 years old. when you look at the catch rates per unit effort the very smallest group across 10 years is greater than 18". When you extrapolate out the numbers you find that 69% of the population is under 18". Only 10-15% are above 22". I'd like to see total population estimates added to the data along with Young of year.
If you have followed many of the Saugeye post you know I am against Saugeye length limits. I think this data supports my argument. Why are we protecting a species of fish as a trophy fishery when ~85% will never be available as trophies ( >22") ? Predominately the age of fish, as shown by these data, most available is 15-22" and within the length limit. So you can ague that this works for the length limit, but the question is how many drop out of the population before that? I also ask, if people were allowed to keep smaller fish would they be off the lake sooner and thus allow more of the 15-18" group to survive to grow? Conveniently for the argument for limits they include 15" fish in this group. I would like to see the length weight sheets. I bet a large part of that group is <16". I am not sure what size mesh the gill nest are, but I imagine they are large enough that Young of year pass through and they target larger fish. So the age size structure is not totally true and it would be really nice to see some electrofishing data added to build a more reliable estimate of age length structure.
Over all it looks like our Saugeye are doing quite well
I actually went through all the regions and compared the data sets. First I must say I am disappointed in the variances between what the different districts have posted and wonder if it is a reflection of work done or just a failure to report. After looking at the survey data for Saugeye I will offer my thoughts.
First only district 4 offered any electrofishing young of year data (that I noticed) and the rest posted gill net surveys for larger fish. I'd be interested in initial yoy survival too. when I look at the charts for gill net surveys, two things jump out: 1) Growth rates are much higher than I expected (i will recant and accept I was wrong in previous post on growth rates) 2.) That very few fish are living past 3 years old. when you look at the catch rates per unit effort the very smallest group across 10 years is greater than 18". When you extrapolate out the numbers you find that 69% of the population is under 18". Only 10-15% are above 22". I'd like to see total population estimates added to the data along with Young of year.
If you have followed many of the Saugeye post you know I am against Saugeye length limits. I think this data supports my argument. Why are we protecting a species of fish as a trophy fishery when ~85% will never be available as trophies ( >22") ? Predominately the age of fish, as shown by these data, most available is 15-22" and within the length limit. So you can ague that this works for the length limit, but the question is how many drop out of the population before that? I also ask, if people were allowed to keep smaller fish would they be off the lake sooner and thus allow more of the 15-18" group to survive to grow? Conveniently for the argument for limits they include 15" fish in this group. I would like to see the length weight sheets. I bet a large part of that group is <16". I am not sure what size mesh the gill nest are, but I imagine they are large enough that Young of year pass through and they target larger fish. So the age size structure is not totally true and it would be really nice to see some electrofishing data added to build a more reliable estimate of age length structure.
Over all it looks like our Saugeye are doing quite well