I mentioned this last Feb, but there’s more info and a great video out about it now….
The AnglingBuzz crew partnered with the Minnesota DNR to study the effects of barotrauma on crappies based on the depth of water the fish were being caught out of.
> For a lot of anglers, winter crappie fishing revolves around deeper basins…. It’s a relatively simple pattern. In late-fall large schools of crappies dump into deeper water to feed on a number of different invertebrates that are concentrated in the soft-bottom basins.
> With new technology like forward-facing sonar these fish are easier to find and catch than ever before.
> The issue at hand is that crappies caught out of these deep-water basins are suffering from barotrauma and have a high mortality rate. Barotrauma is an injury caused by changes in barometric water pressure.
> For this study, 50 crappies were caught out of 3 different lakes. The fish were measured, fin clipped, and the severity of crappie barotrauma was recorded. The crappies were released into a hoop net that was extended from the water’s surface to the bottom. The goal was to see how many crappies would survive and see how barotrauma affected these fish caught in deep water. The crew came back the following day to record the results.
Lake #1:
> Fifty crappies were caught between 28-32’ in a basin that had a max depth of 44’. In depths greater than 28’ of water 76% of the crappies died or were non-releasable, meaning they could not return to depth.
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