Abstract
The formation of the first annual zone in three populations of resident sock-eyed salmon—kokanee Oncorhynchus nerka of Kamchatka—has been studied. The length of fingerlings in mid-August did not reach 30 mm; in most analyzed juveniles, the remains of the yolk sac were present. In early September in lakes Tolmachevskoe and Kronotskoe, the length of the fingerlings was about 40 mm. The scales in fish from different populations begin to form in early September. Towards November, no more than nine sclerites are formed; a similar amount has been recorded at the beginning of summer also in fingerlings. When scales of adult fish are studied, there are 4 to 19 sclerites in the first annual zone. Apparently, the first annual ring does not form in a considerable portion of fingerlings.
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