The amur pike (Esox reicherti Dybowski) in Fishes of the Amur Basin (results of the Ichthylogical Expedition to the Amur Region, 1945-1949 by G. V. Nikolsky, 1956) (Fisheries research report: 1787)

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Feeding
Young pike, 5 cm or more in length, feed almost completely on
fry of other fish. As shown by M. N. Lishev (1950), the diet of pike
50-80 mm long consisted mostly of fry from various cyprinids 15 to
40 mm long. Average size of prey was 15 to 25% of the size of the predator,
maximum 57%. Composition of the diet of pike 17 cm or more, differed
slightly in relation to size.
In spring, following spawning, pike begin to feed intensively.
Basic food of pike in flows, bays and lakes is serebriani caras (Carassius
auratus) [ goldfish], which represents 25-88% of weight of food in different
samples; other diet components play subordinate roles. In the summertime,
at the Amur River bed, the most important food items in the pike diets are
Amurskiy cebak (Leuciscus waleckii Dybowski) and podust-chernobriushka
(Xenocypris macrolepis). In the fall, the basic component of pike diet
changes very often and depends on which prey fish migrate from tributaries
to the Amur in the given moment. So, at the beginning of October 1947,
the predominant food item was podust-chernobriushka and vostrobriushka
(Hemiculter leucisculus leucisculus, Vasilevsky), and at the end of
October it was caras (Carassius auratus), Malaya coriushka (Hypomesus
olidus, Pallas) and cebak. Caras, which is the most important food item
in the spring, summer and fall, is not eaten in winter. Basic food items
in winter are Malaya coriushka, podust-chernobriushka, kon(s) (genus
Hemibarbus), vostrobriushka, and peskar(s) (in general, genus
Rostrogobio).