pectoral fin

US /ˈpek.tər.əl fɪn/
UK /ˈpek.tər.əl fɪn/
"pectoral fin" picture
1.

nadadeira peitoral

either of a pair of fins situated on each side of a fish's body, typically just behind the gills, that correspond to the forelimbs of other vertebrates

:
The shark used its pectoral fins to steer through the water.
O tubarão usou suas nadadeiras peitorais para se guiar na água.
Fish use their pectoral fins for balance and braking.
Os peixes usam suas nadadeiras peitorais para equilíbrio e frenagem.