To the issue of the origin of false annual rings on scale of juvenile Pacifi c salmon in the Bolshaya River system (Southeast Kamchatka)
https://doi.org/10.15853/2072-8212.2022.67.33-45
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.
About the Authors
V. F. Bugaev
Kamchatka Branch of Russian Federal Research Institute of Fisheries and Oceanography (KamchatNIRO)
Russian Federation
Russian Federation
Doctor of Biological Sciences, has worked in KamchatNIRO since 1973, in recent years – as a leading researcher at the Laboratory of Salmon Fishes, Sector of Pacifi c Salmon
Petropavlovsk-Kamchatsky
O. V. Zikunova
Kamchatka Branch of Russian Federal Research Institute of Fisheries and Oceanography (KamchatNIRO)
Russian Federation
Russian Federation
Ph. D. (Biology), Head of Lab
Petropavlovsk-Kamchatsky
T. N. Travina
Kamchatka Branch of Russian Federal Research Institute of Fisheries and Oceanography (KamchatNIRO)
Russian Federation
Russian Federation
Senior specialist
Petropavlovsk-Kamchatsky
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Review
For citations:
Bugaev V.F., Zikunova O.V., Travina T.N. To the issue of the origin of false annual rings on scale of juvenile Pacifi c salmon in the Bolshaya River system (Southeast Kamchatka). The researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean. 2022;(67):33-45. (In Russ.) https://doi.org/10.15853/2072-8212.2022.67.33-45
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