Fish Mortality

[DADAKOTA]

Saw this on Bass Blaster and thought Wrench might want to read it.

Link to study 

https://cdnsciencepub.com/doi/abs/10.1139/cjfas-2020-0442 

Quote of the Day   "Our results reveal both non-tournament and tournament angling mortality are low compared to natural mortality in some lakes."   - Dang straight! From an IA (I think?) study:   > Average total annual mortality was 0.66 with natural mortality representing the largest mortality source (0.57) followed by delayed tournament mortality (0.06), non-tournament angling mortality (0.02), and initial tournament mortality (0.006).   > Our results reveal both non-tournament and tournament angling mortality are low compared to natural mortality in some lakes. Therefore, cumulative angling mortality likely has minimal population level effects on some bass populations.

[fishinwrench]

That topic is so irritating.   Whatever you want the outcome to be.....you can find ACCREDITED info to support it.   

[FishnDave]

I don't care much either way...no horse in this race.  Just wanted to point out that we can find studies to support just about any agenda. Interesting how some studies show one thing, others show something else.  We quote the ones we like, and don't mention the ones we don't.  Here's some studies that could be construed to offer an opposing view to the original post above.

http://seafwa.005.neoreef.com/15Hysmith_et_al_98-102.pdf

Quote of the day:

"Instantaneous total fishing mortality was estimated to be 0.14, with tournament mortality responsible for 65% of all angling-caused fish deaths."

 

Apparently the range of mortality by lake or tournament varies greatly, again making it easy for folks to pick and choose which ones to include to further their agenda.  In the study below...0% sounds great!  ...While 43.9% or 55.5% is horrifying.

https://minds.wisconsin.edu/bitstream/handle/1793/81189/Williamson.pdf?sequence=1&isAllowed=y#:~:text=Among six professional bass tournaments,were 0% and 16.0%.

 

"Bass Tournament Mortality

Among six professional bass tournaments studied, total mortality rates of largemouth bass ranged from 0% to 43.9%, and smallmouth bass from 0% to 55.5% when adjusted for reference fish mortalities. During two simulated tournaments, mortality rates of culled LMB were 0% and 16.0%."

[FishnDave]

45 minutes ago, fishinwrench said:

That topic is so irritating.   Whatever you want the outcome to be.....you can find ACCREDITED info to support it.   

true

[Al Agnew]

9 hours ago, fishinwrench said:

That topic is so irritating.   Whatever you want the outcome to be.....you can find ACCREDITED info to support it.   

The accredited info is what it is.  On a subject like this, results will vary all over the place because of location, timing, who's running the tournaments, or who knows.  SCIENCE will consider all the credible studies, and eventually come up with overall averages, outcomes based upon conditions, etc.  People with agendas will cherry-pick the studies that are the closest outcomes to what they want to push.