byleth fish nets Rising Fishing Brookie Net Package Ember / Clear Bag The Brookie fly fishing net and magnetic tether combo is handmade for fly fishermen looking for a vintage look package hand made in the USA Tons of Discarded Fishing Nets

Spring They have a spring on the bottom part

A car or boat battery is also a good choice

Theres a wide selection of variations on this idea but overall most of these have a diving, wiggling action underwater and a fairly aggressive pop on the surface

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It's also worth mentioning that all of the Nomad nets float, so should one get lose in the stream, it won't head straight for Davy Jones' locker before you have a chance to retrieve it