Unicorn Fish is a fish. It begins with the letter U.
· Rainbow Trout
· Barracuda
Great White Shark
Icefish and ide are fish. They begin with the letter i.
Some sea creatures have ansetors of dinosaurs
Walrus, whales, whiting
Paddlefish, parrotfish, perch, pike, piranha and pufferfish are fish. They begin with P.
· Tiger Shark · Tilapia · Trout · Tuna
If you mean, "are all under water creatures, sea creatures?" then no. The term SEA is for the ocean and there also can be creatures in freshwater. Also some creatures that live in water such as some snakes and sea turtles come out of the water every so often, so they are no total sea/water creatures. Fish are underwater creatures though.
both because some sea creatures eat others. unlike cuttlefish they try to eat eachother.i hope this answers your question.
· Needlefish · Northern Pike · Nurse Shark
Quillback (an eel-like fish) and Queen Triggerfish are fish. They begin with the letter Q.