. The Canadian field-naturalist. 26 The Canadian Field-Naturalist Vol. 104. FlGl'RE 3. Canadian distribution of the Blackline Prickleback. Acatiiholunipemis niackayi. unpublisheif). In Alaska, it has been taken at the mouth of the Nushagak River to a depth of 56 m (Schmidt W50). The species is most abundant in the Gulf of Terpenium at 29 to 50 m over sandy and silty bottoms; it has also been taken from brackish waters in lakes of northern Hokkaido and the estuary of the Amur River (McAllister. unpublisht\D. The species thus appears to be tolerant of brackish waters but is likely euryhaline as
. The Canadian field-naturalist. 26 The Canadian Field-Naturalist Vol. 104. FlGl'RE 3. Canadian distribution of the Blackline Prickleback. Acatiiholunipemis niackayi. unpublisheif). In Alaska, it has been taken at the mouth of the Nushagak River to a depth of 56 m (Schmidt W50). The species is most abundant in the Gulf of Terpenium at 29 to 50 m over sandy and silty bottoms; it has also been taken from brackish waters in lakes of northern Hokkaido and the estuary of the Amur River (McAllister. unpublisht\D. The species thus appears to be tolerant of brackish waters but is likely euryhaline as salinities in the Gulf of Terpenium and the Aleutians would be expected to be high (McAllister, unpuhlisheif). Larval specimens were taken in Tukto\aktuk Harbour in the upper halocline at depths of to m (Ratynski 19S3) m cooler more saline waters. Shcheiinniko\ (1983) suggested that spawning areas arc located in shallower waters. Rat\nski (1983) indicated that the cooler saline bottom la>ers of Tuktovaktuk Harbour may be of critical importance for spawning of the Canadian populations. The body shape, frequency of catch in bottom trawling, and food composition all indicate that the Blackline Prickleback is benthic. feeding on the bottom and rarely in the water column near the bottom (Shchetinnikov 1983). Shchetinnikov (1983) also indicated that the species is non- schooling. General Biology Information on the biology of the species is limited. Ratynski (1983) reported that females taken in Tuktoyaktuk Harbour in September 1982 w ere nearly ripe and females collected in .August of 1971 had eggs to mm in diameter (McAllister 1975). Shchetinnikov (1983) indicated that males and females collected in July of 1978 in the Gulf of Terpenium were in post-spawning condition. Both Ratynski (1983) and Shchetin- nikov (1983) suggested that the fish move into shallow water to spawn and the younger fish remain in deepver waters to Please note that these images are ext
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