''Plectroglyphidodon altus'', commonly known as the Japanese gregory, is a

damselfish Damselfish are those fish within the subfamilies Abudefdufinae, Chrominae, Lepidozyginae, Pomacentrinae, and Stegastinae within the family Pomacentridae. Most species within this group are relatively small, although the four largest speci ...

of the

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

Pomacentridae Pomacentridae is a family of ray-finned fish, comprising the damselfishes and clownfishes. This family were formerly placed in the order Perciformes or as indeterminate percomorphs, but are now considered basal blenniiforms. They are primaril ...

. It is native to the northwestern Pacific Ocean in the seas around Japan and the

Ryukyu Islands The , also known as the or the , are a chain of Japanese islands that stretch southwest from Kyushu to Geography of Taiwan, Taiwan: the Ryukyu Islands are divided into the Satsunan Islands (Ōsumi Islands, Ōsumi, Tokara Islands, Tokara and A ...

. It has also been reported from Taiwan and South Korea. It is found on rocky reefs at depths ranging from .

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altus Altus or ALTUS may refer to: Music *Alto, a musical term meaning second highest musical or vocal type * Altus (voice type), a vocal type also known as countertenor Places * Altus, Arkansas, US ** Altus AVA, a wine-growing region near Altus, Ark ...

Fish described in 1937 {{Pomacentridae-stub