Clupea harengus pallasii is a type of herring fish that is commonly found in the Pacific Ocean. There are a number of different synonyms that can be used to refer to this fish, depending on the context and the region in which it is found. Some common synonyms include Pacific herring, western herring, Alaska herring, and Sakhalin herring. These different names can help to clarify which specific species of herring is being referred to, and can be used in scientific studies, commercial fishing operations, and culinary contexts. Regardless of the name used, the Clupea harengus pallasii is an important part of many marine ecosystems and plays a vital role in the food chain.