Originally Posted by
CrappiePappy
They are used to keep fish upright. Usually fish caught from deep water get the "bends" and may tend to float upside down in the livewell, stressed fish sometimes float on their side. The weights are clipped onto the anal fin to keep the fish upright AND below the surface of the water in the livewell, so that both gills are underwater.
Fin weights are also used for fish caught from deep water, instead of "fizzing" them (fizzing is running a hypodermic needle into the side of the fish to puncture the air bladder and release the air). Fish brought from deep water, where the atmospheric pressure is greater, will have their air bladder expand as they're brought to the surface, where the atmospheric pressure is less. Sometimes the air bladder can protrude from the fish's mouth when brought to the surface from great depths.
Will keeping them in the livewell with the weights allow them to recover so you can release them? This is one of my concerns as I start to fish Lake Washington. Many of the crappie will be found 40-70 foot deep in this water and I do not plan on keeping very many of them. So I have been concerned about how to keep them alive when I release them over the next few months.
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