sentences:  Rivers on these islands are populated by sturgeon, salmon, trout, and various other fish.The waters around these coastal islands are frozen for about eight months of the year on average.Pinnipeds (such as harbour seals, bearded seals, common seals, ribbon seals (on sea ice) and Steller sea lions), sea otters, and cetaceans such as minke whales, killer whales, and the critically endangered bowhead whales, western gray whales and belugas can be seen off the islands.