Robots are being developed to help with tasks like fixing the sea cages where fish are farmed, and their size seems to be all that affects how the fish react
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https://www.newscientist.com/article/2236854-small-robots-could-help-look-after-salmon-without-stressing-them-out/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
