Plankton is a small planktonic copepod and the self-proclaimed archenemy of Mr. Krabs. It filter feeds on phytoplankton and small zooplankton, such as calanoid copepod nauplii. Plankton is an intellectual planktonic copepod and Karen is a waterproof supercomputer. During the naupliar stage, the copepod host ingests the unicellular dinospore of the parasite. Co-adaptation between mtDNA and nDNA sequences has been studied in the copepod "Tigriopus californicus". A species of copepod, "Balaenophilus unisetus", inhabits baleen plates of whales in tropical waters. It is run by a small, green, one-eyed copepod named Plankton and his computer-wife, Karen. The most common parasites that cleaner fish feed on are gnathiidae and copepod species. Another copepod, Pseudocycnoides appendiculatus, has been documented as parasitic on the gill filaments. Acartia tonsa is a species of marine copepod in the family Acartiidae. "Pseudodiaptomus forbesi" is the dominant calanoid copepod of the LSZ in terms of biomass. Generally, adult copepod females and juveniles are infected. If copepod concentrations reach high levels, schooling herrings adopt a method called ram feeding. After a further five moults, the copepod takes on the adult form. A single juvenile herring could never catch a large copepod.