(species) the Yangtze River dolphin, a freshwater dolphin native to China and now considered functionally extinct; also called [[白鱀豚|白鱀豚|bai2 ji4 tun2]] or [[白豚|白豚|bai2 tun2]]

the fin at the end of a fish's body used for swimming; caudal fin

the fin on the back of a fish or other aquatic animal

The fins located on either side of a fish's body behind the gills, used for steering and movement.

one of the paired fins on the belly of a fish used for steering and maintaining balance; equivalent to the hind limbs of higher vertebrates

The fin on the back of a fish or other aquatic animal; same as [[背鳍|背鰭|bei4 qi2]]

the fin located on the belly of a fish behind the anus, used for stability during swimming

a species of cyprinid fish (Sarcocheilichthys czerskii) endemic to the Amur River basin

a device used on ships to reduce rolling in rough seas; anti-roll stabilizer

The fin-like structure on cephalopods such as cuttlefish, used primarily to assist in swimming.

fish fin

Bony or cartilaginous spine-like structures within a fish's fin, particularly the part closest to the skin, used to support the fin shape and movement

pinnate compound leaf or a leaf structure resembling a fin

one of the horny or bony rays that support the fin of a fish

a broad, flat limb used for swimming by sea animals like whales or seals