To the issue of the origin of false annual rings on scale of juvenile Pacifi c salmon in the Bolshaya River system (Southeast Kamchatka)

Author:

Bugaev V. F.1,Zikunova O. V.1,Travina T. N.1

Affiliation:

1. Kamchatka Branch of Russian Federal Research Institute of Fisheries and Oceanography (KamchatNIRO)

Abstract

Seasonal growth and formation of annual rings on scale of juvenile Pacifi c salmon (Chinook, sockeye, coho and cherry salmons) restart in the Bolshaya River basin from mid May to mid June. In the last half of June and until the end of July, there are actually no additional formations on the scales of both underyearlings and yearlings. In August–October false annual rings (FARs) of dense circuli can be observed on scales of underyearlings of species mentioned above. Forming the extra FARs in the yearlings of coho and cherry salmon during their second season of growth not found (few exceptions only). The underyearling’s FARs are most frequent (17.4%) in Chinook salmon, following by sockeye salmon (12.1%) and coho salmon (7.1%), and the most rare (1.0%) in cherry salmon. The frequency of the FARs in yearlings during their growth period in the fi rst summer is 28.1% in Chinook salmon, 12.6% in sockeye salmon, 11.7% in coho salmon and 4.8% in cherry salmon.

Publisher

Kamchatka Research Institute of Fisheries and Oceanography

Reference19 articles.

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3. Bugaev V.F., Rastyagaeva N.A., Travina T.N. Issues of seasonal growth of juvenile sockeye salmon Oncorhynchus nerka in the Bolshaya (Western Kamchatka). Mater. ХVII–ХVIII Intern. scientifi c conf. “Conservation of the biodiversity of Kamchatka and adjacent seas”. Petropavlovsk-Kamchatsky: Kamchatpress, 2018, pp. 42–56. (In Russian)

4. Bugaev V.F., Rastyagaeva N.A., Travina T.N. On the problem of water temperature infl uence on seasonal growth of juvenile coho salmon Oncorhynchus kisutch in the lower reaches of the Bolshaya River in 2007–2018. Izvestya TINRO, vol. 199, pp. 49–63. (In Russian)

5. Bugaev V.F., Rastyagaeva N.A., Travina T.N. The increasing of body length and number of sclerites in year ling of coho salmon Oncorhynchus kisutch and cherry salmon O. masou in May–September in the Bolshaya River watershed (date 2007–2019). Mater. XXI Intern. scientific conf. “Conservation of the biodiversity of Kamchatka and adjacent seas”. Petropavlovsk-Kamchatsky: Kamchatpress, 2020, pp. 27–32. (In Russian)

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