Feeding habits of juvenile sockeye salmon of different ages in the Kurile Lake pelagial (Kamchatka) on the data for 1967 and 1972
https://doi.org/10.15853/2072-8212.2021.63.59-72
Abstract
A study was made of the nutrition of different-sized sockeye salmon underyearlings during the littoral feeding period in the summer-autumn period of 1972 on lake and river habitats. Diet of 2and 3-year-old sockeye salmon individuals sampled in pelagic zone was analyzed also. It was found, that permanent and dominating component in the diet of the age groups 0+, 1+ and 2+ of juvenile sockeye salmon in the littoral and pelagic zones of Kurile Lake was plankton crustacean Cyclops scutifer: up to 1700 individuals per one stomach, making 33.3–99.6% of the stomach content. Juvenile sockeye salmon were feeding on the cyclops of various ontogenetic stages, the bigger were juvenule sockeye salmon individuals, the higher was the part of large copepodids of late stages, mature individuals. The other components of the diet included larval chironomids, which role was maximum in feeding of underyearlings with the body length 26–30 mm, pupal chironomids and imago aerial insects. Index of fullness of the underyearling stomach in the samples from the lake littoral and composition of the forage spectra indicated that condition of feeding were different in different habitats.
About the Authors
I. A. Nosova
Kamchatka Branch of Russian Research Institute of Fisheries and Oceanography (“KamchatNIRO”)
Russian Federation
Russian Federation
Irina A. Nosova, Ph. D. (Biology); from 1972 to 1987 — Senior Scientist of Kamchatka Research Institute of Fisheries and Oceanography (KamchatNIRO)
683000 Petropavlovsk-Kamchatsky, Naberezhnaya Str., 18
E. V. Lepskaya
Kamchatka Branch of Russian Research Institute of Fisheries and Oceanography (“KamchatNIRO”)
Russian Federation
Russian Federation
Ekaterina V. Lepskaya, Head of Lab., Ph. D. (Biology)
683000 Petropavlovsk-Kamchatsky, Naberezhnaya Str., 18
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Review
For citations:
Nosova I.A., Lepskaya E.V. Feeding habits of juvenile sockeye salmon of different ages in the Kurile Lake pelagial (Kamchatka) on the data for 1967 and 1972. The researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean. 2021;(63):59-72. (In Russ.) https://doi.org/10.15853/2072-8212.2021.63.59-72
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