Kaev, A.M., Osobennosti vosproizvodstva kety v svyazi s eye razmerno-vozrastnoi strukturoi (Features of Chum Salmon Reproduction Related to Fish Size and Age Structure), Yuzhno-Sakhalinsk: SakhNIRO, 2003. Kaev, A.M., Origin and life history of Okhotsk Sea chum salmon Oncorhynchus keta as inferred from scale study, J. Ivankov, V.N., Dobritskii, O.Yu., Skuba, N.S., and Karpenko, A.I., Differentiation of pink salmon Oncorhynchus gorbuscha populations of southern Sakhalin, Russ. and Shershneva, V.I., Dynamics of energy consumption and expenditure of juvenile salmon during post-catadromous feeding migrations in the Okhotsk and Bering seas, Izv. and Chernova, O.F., Cheshuya kostistykh ryb kak diagnosticheskaya i registriruyushchaya struktura (Scales of Bony Fishes as a Diagnostic and Recording Structure), Moscow: KMK, 2009.ĭulepova, E.P., Sravnitel’naya bioproduktivnost’ makroekosistem dal’nevostochnykh morei (Comparative Bioproductivity of Macroecosystems in the Far Eastern Seas), Vladivostok: TINRO-Tsentr, 2002.Įrokhin, V.G. Goncharov, A.I., Features of the circulus structure of scales from same-sized fish of different ages, Tr. Vyalova, G.P., Ivanova, I.M., Steksova, V.V., and Omelchenko, V.T., Pink salmon of the Sakhalin–Kuril region: Differentiation and population structure of marine aggregations, in Rybokhozyaistvennye issledovaniya v Sakhalino-Kuril’skom raione i sopredel’nykh akvatoriyakh (Fisheries Research in the Sakhalin–Kuril Region and Adjacent Waters), Yuzhno-Sakhalinsk: SakhNIRO, 1999, vol. 104–112.īugaev, A.V., Shaporev, R.A., Koval, M.V., et al., Distribution of regional complexes of Asian stocks of chum salmon Oncorhynchus keta in the period of prespawning migration within exclusive economic zone of Russia, Izv. We hypothesize that the pattern of circuli spacing and annulus formation are responses to photoperiod and food availability which the fish experience during their existence at sea.Bugaev, A.V., Some methodical aspects for identification local stocks of Pacific salmon by scale pattern analysis, Izv. Thus, annuli are formed about the time of the equinox and during a declining temperature regime. However, oceanic temperatures were declining at this time and do not reach minima until April. No significant variation in average spacing between circuli was explained by oceanic temperatures.Īnnuli were formed between November and January. There were significant (p < 0.05) differences in the distance between circuli formed in the summer and in the two stocks for various years at sea. Statistical analyses were conducted only on age 2.2 fish because of small sample sizes in four of the six years for age 2.3 fish. This pattern was persistent for fishes of two river systems, six year–classes and two age groups (2.2 and 2.3) and was due to summer growth. The average distance between circuli formed during the second year of ocean growth is much less than that of first year or in subsequent years. This study describes a pattern of circulus spacing on the scales of sockeye salmon, Oncorhynchus nerka, which has not been reported previously.

Circuli in fish