The best replacement for fishfinder is sounder.

The best alternatives to fishfinder are rated as following:
★★★★★  sounder
★★★  lowrance elite 4
★★★  lowrance fishfinder
★★★  hummingbird
★★  depth finder
★★  lowrance
★  depth sounder
★  humminbird

Your alternative for fishfinder is not listed? Suggest!
Speaking about fishfinder, one probably shouldn't forget about chirp.

Other search terms related to fishfinder and their ratings are:
★★★★★ chirp
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Google Trends

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fishfinder
sounder
lowrance elite 4