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The shiner perch, known as Cymatogaster aggregata, is the only member of its genus.
Shiner perches live in estuaries / lagoons throughout the Eastern Pacific - from Alaska to Baja California.
Females mate once per year. Males attach to females, and serve as parasites whilst donating sperm. After the males run out, the females give birth. The cycle then repeats.
Female shiner perch are much larger than male shiner perch. Males are extremely small, and serve nearly no purpose.
Shiner perch feed on zooplankton through the year. Males feed on the blood of females before dying.
Male sterility is a problem with perch, as sterile males can waste a female's time. Thus, females tend to be promiscuous.
