Fish inspired robots are nothing new. We have covered a bunch of them here in the past. Nana Obayashi has developed one that is scalable length wise. It is modeled on cod and mackerel. It has a front section that is rigid and a flexible tail that is made of fiberglass rods. As they explain:
” A single motor pulls two tendons that cross near the tail’s end, producing the “S”-shaped bend required for fish-like swimming motion.”
[HT]