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The shiner perch (''Cymatogaster aggregata'') is a common surfperch found in estuaries, lagoons, and coastal streams along the Pacific coast from 
Shiner perches are similar to
Alaska
Alaska ( ; russian: Аляска, Alyaska; ale, Alax̂sxax̂; ; ems, Alas'kaaq; Yup'ik: ''Alaskaq''; tli, Anáaski) is a state located in the Western United States on the northwest extremity of North America. A semi-exclave of the U.S. ...
to Baja California
Baja California (; 'Lower California'), officially the Free and Sovereign State of Baja California ( es, Estado Libre y Soberano de Baja California), is a state in Mexico. It is the northernmost and westernmost of the 32 federal entities of Mex ...
. It is the sole member of its genus. The shiner perch is also known as seven-eleven and shiner seaperch.https://www.collinsdictionary.com/us/dictionary/english/shiner-perch
Shiner perches are similar to tule perch
The tule perch ''Hysterocarpus traskii'' is a surfperch ( Embiotocidae) native to the rivers and estuaries of central California, United States of America. It is the sole member of its genus, and the only freshwater surfperch.
The tule perch is ...
es, deep-bodied with a dusky greenish back and silvery sides that have a pattern combining fine horizontal bars with three broad yellow vertical bars. Breeding males turn almost entirely black, the barred pattern being obscured by dark speckles. Shiner perches are distinguished from tule perches by having fewer dorsal fin
A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom. Many species of animals possessing dorsal fins are not particularly closely related to each other, though through c ...
spines, just 8–9 vs the 15–19 of the tule perch. The rayed part of the dorsal fin has 18 to 23 rays. The anal fin has 3 spines followed by 22–25 rays.
They are one of the most common fish in the bays and estuaries of their range, favoring beds of eelgrass Eelgrass is a common name for several plants and may refer to:
* ''Zostera'', marine eelgrass
* ''Vallisneria'', freshwater eelgrass
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