Relationship between size-weight parameters of soсkeye salmon Oncorhynchus nerka smolts emigrated from Lake Azabachye (Kamchatka River basin) in 1979–2013 and abundance of mature fsh in the sea in 1982–2016

Two groups of juvenile sockeye salmon are feeding in Lake Azabachye. They belong to the 2nd order stock of the lake (stock A) and to other 2nd order stocks of middle and down stream tributaries of the Kamchatka River which underyearlings migrate into the lake for feeding and wintering (group E). The main part of the stock A leaves the lake to the sea at the age 2+ (mainly 2.3) and the youngsters of the group E migrate to the sea at the age 1+ (mainly 1.3). The body length and weight parameters of the stock A smolts at the age 2+ and the group E smolts at the age 1+ could be similar or dissimilar in particular years. The maximal difference between the smots of these stocks is observed in the years with higher body length and weight for the stock A. Mean for 1979–2016 length and weight of smolts at abovementioned ages are evaluated as 98.42/87.46 mm and 10.40/7.38 g for the A/E stocks. For the stock A, statistically signifcant positive correlation is noted between size-weight parameters of smolts in the years of emigration and their abundance in the years of mass return. However, the regression has a shift between the periods of emigration/return of 1979–2000/1982–2003 and 2003–2013/2006–2016. The correlation is higher for the frst period (r = 0.820; P < 0.001 for body weight and r = 0.797; P < 0.001 for body length, n = 16) than for the second one with higher abundance (r = 0.669; P < 0.05 for body weight and r = 0.711; P < 0.05 for body length, n = 11). On opposite, the returns of the group E depend weakly on size-weight parameters of its smolts for the period of emigration/return of 1979–1997/1982–2000 (no data for return in 1999) and the dependence is insignifcant for the period of 2000–2013/2003–2016.

1. Belousov, A.B. and Belousova, M.G., The eruption at Shiveluch Volcano in 1964 (Kamchatka), a Plinian eruption preceded by a large-scale collapse of buildings, Vulkanol. Seismol., 1995, nos. 4–5, pp. 116–125.

2. Bugaev, A.V., Prednerestovye migratsii tikhookeanskikh lososei v ekonomicheskoi zone Rossii (Pre-Spawn Migrations of Pacifc Salmon in the Economic Zone of Russia), Petropavlovsk-Kamchatsky: KamchatNIRO, 2015.

3. Bugaev, V.F., Aziatskaya nerka (presnovodnyi period zhizni, struktura lokal’nykh stad, dinamika chislennosti) (Asian Sockeye Salmon (Freshwater Life History, Structure of Local Stocks, and Population Dynamics)), Moscow: Kolos, 1995.

4. Bugaev, V.F., Aziatskaya nerka–2 (biologicheskaya struktura i dinamika chislennosti lokal’nykh stad v kontse XX — nachale XXI vv.) (Asian Sockeye Salmon–2 (Biological Structure and Abundance Dynamics of Local Stocks in the Late 20th and the Early 21st Century)), Petropavlovsk-Kamchatsky: Kamchatpress, 2011.

5. Bugaev, V.F., Dynamics of biological characteristics of sockeye salmon Oncorhynchus nerka in the Kamchatka River in 1995–2016, in Dokl. 17–18 mezhdunar. nauchn. konf. “Sokhranenie bioraznoobraziya Kamchatki i prilegayushchikh morei” (Proc. 17th–18th Int. Sci. Conf. “Conservation of Biodiversity of Kamchatka and the Adjacent Seas”), Petropavlovsk-Kamchatsky: Kamchatpress, 2018, pp. 19–41.

6. Bugayev, V.F., The method of identifcation of individuals from the main local stocks and groups of the sockeye salmon Oncorhynchus nerka (Walbaum) in catches of coastal and river fsheries in the Kamchatka River basin, Vopr. Ikhtiol., 1986, vol. 26, no. 4, pp. 600–609.

7. Bugayev, V.F., Some remarks on the identifcation of sockeye salmon Oncorhynchus nerka stocks by scale method and on the estimation of their gill-net fshery catch in the economic zone of Russian Federation in 1995–2002. Discussion, Izv. Tikhookean. Nauchno–Issled. Inst. Rybn. Khoz. Okeanogr., 2004a, vol. 136, pp. 90–108.

8. Bugayev, V.F., Levels of reproduction of sockeye salmon oncorhynchus nerka of “Е” group and its’ structural elements (Kamchatka River Basin), in Dokl. 4 nauchn. konf. “Sokhranenie bioraznoobraziya Kamchatki i prilegayushchikh morei” (Proc. 4th Sci. Conf. “Conservation of Biodiversity of Kamchatka and the Adjacent Seas”), Petropavlovsk-Kamchatsky: KamchatNIRO, 2004b, pp. 6–15.

9. Bugayev, V.F., Application of results from identifcation of Kamchatka River sockeye salmon Oncorhynchus nerka individuals of minor local stocks and groups in commercial catches: analysis of fsh growth rate in the stock “A” and group “E” from the data for the period 1989–2004, in Dokl. 6 mezhdunar. nauchn. konf. “Sokhranenie bioraznoobraziya Kamchatki i prilegayushchikh morei” (Proc. 6th Int. Sci. Conf. “Conservation of Biodiversity of Kamchatka and the Adjacent Seas”), Petropavlovsk-Kamchatsky: Kamchatpress, 2006, pp. 6–21.

10. Bugayev, V.F. and Bazarkin, V.N., On the scales structure and growth of the juvenile sockeye salmon Oncorhynchus nerka (Walbaum) from Lake Azabachye (Kamchatka), Vopr. Ikhtiol., 1987, vol. 27, no. 1, pp. 59–72.

11. Bugayev, V.F., Bazarkin, H.V., and Bazarkina, L.A., Residual morph of threespine stickleback Gasterosteus aculeatus as an indicator of feeding conditions for juvenile sockeye salmon Oncorhynchus nerka in Azabachye Lake (Kamchatka River basin), Izv. Tikhookean. Nauchno–Issled. Inst. Rybn. Khoz. Okeanogr., 2004, vol. 139, pp. 134–144.

12. Bugayev, V.F. and Bazarkina, L.A., The impact of volcanism on the abundance of the sockeye salmon Oncorhynchus nerka in the Kamchatka River, in Dokl. 12–13 mezhdunar. nauchn. konf. “Sokhranenie bioraznoobraziya Kamchatki i prilegayushchikh morei” (Proc. 12th–13th Int. Sci. Conf. “Conservation of Biodiversity of Kamchatka and the Adjacent Seas”), Petropavlovsk-Kamchatsky: Kamchatpress, 2013, pp. 52–66.

13. Bugaev, V.F., Vronsky, B.B., Zavarina, L.O., Zorbidi, Zh.Kh., Ostroumov, A.G., and Tiller, I.V., Ryby reki Kamchatka (Fish of the Kamchatka River), Petropavlovsk-Kamchatsky: KamchatNIRO, 2007.

14. Bugayev, V.F. and Dubynin, V.A., Factors determining length and weight of sockeye Oncorhynchus nerka smalts migrated from Kurilskoe Lake (Ozernaya River) and Azabachye Lake (Kamchatka River), Izv. Tikhookean. Nauchno–Issled. Inst. Rybn. Khoz. Okeanogr., 1999, vol. 126, pp. 383–400.

15. Bugayev, V.F. and Dubynin, V.A., Factors determining body length and weight of sockeye (Oncorhynchus nerka) smalts migrating from Lake Kurilskoye (Ozernaya River) and Lake Azabachye (Kamchatka River). Analysis by the stepwise regression method, in Sb. nauchn. dokl. rossiisko-am. konf. sokhraneniyu lososevykh “Voprosy vzaimodeistviya estestvennykh i iskusstvennykh populyatsii lososei” (Collect. Sci. Pap. Russ.-Am. Conf. Coserv. Salmonids “Issues of Interaction between Wild and Artifcial Salmon Populations), Khabarovsk: Khabar. Otd. TINRO-Tsentra, 2000, pp. 35–49.

16. Krogius, F.V., Krokhin, E.M., and Menshutkin, V.V., Soobshchestvo pelagicheskikh ryb oz. Dal’nego (Community of Pelagic Fishes in Lake Dal’nee), Leningrad: Nauka, 1969.

17. Kurenkov, I.I., Variation in biological capacity of a lake exposed to volcanic ash fall, in Krugovorot veshchestva i energii v ozernykh vodoemakh (The Matter and Energy Cycle in Lacustrine Bodies of Water), Novosibirsk: Nauka, 1975, pp. 127–130.

18. Lakin, G.F., Biometriya (Biometrics), Moscow: Vysshaya Shkola, 1990, 4th ed.

19. Shuntov, V.P. and Temnykh, O.S., Tikhookeanskie lososi v morskikh i okeanicheskikh ekosistemakh (Pacifc Salmon in Marine and Ocean Ecosystems), Vladivostok: TINRO-Tsentr, 2008, vol. 1.

20. Shuntov, V.P. and Temnykh, O.S., Tikhookeanskie lososi v morskikh i okeanicheskikh ekosistemakh (Pacifc Salmon in Marine and Ocean Ecosystems), Vladivostok: TINRO-Tsentr, 2011, vol. 2.

21. Burgner, R.L., Life history of sockeye salmon (Oncorhynchus nerka), Pacifc Salmon Life Histories, Groot, C. and Margolis, L., eds., Vancouver: UBC Press, 1991, pp. 3–117.

22. Clutter, R.I. and Whitesel, L.E., Collection and interpretation of sockeye salmon scales, Int. Pac. Salmon Fish. Comm., 1956, vol. 9.

23. Foerster, R.E., The Sockeye Salmon, Oncorhynchus nerka, Fish. Res. Board Can., 1968, no. 162.

24. Helle, J.H., Martinson, E.C., Eggers, D.M., and Gritsenko, O., Influence of salmon abundance and ocean conditions on body size of Pacifc salmon, NPAFC Bull., 2007, no. 4, pp. 289–298.

25. Irvine, J.R. and Fukuwaka, M., Pacifc salmon abundance trends and climate change, ICES J. Mar. Sci., 2011, vol. 68, no. 6, pp. 1122–1130. doi 10.1093/icesjms/fsq199

26. Kurenkov, I.I., The influence of volcanic ashfall on biological processes in a lake, Limnol. Oceanogr., 1966, vol. 11, no. 3, pp. 426–429.