The dynamics of the liver weight and liver indices in the course of gonad maturation of gadid species on Eastern Kamchatka
https://doi.org/10.15853/2072-8212.2020.59.5-26
Abstract
Longterm data on the liver weight, hepatosomatic (HSI) and gonadosomatic (GSI) indices of walleye pollock, Pacific cod and saffron cod are analyzed on Eastern Kamchatka in seasonal aspect and in the course of gonad maturation. Individual values of the indices extensively vary and depend on the fish body length, season and stage of gonad maturity. The dynamics of the HSI is agree to the dynamics of the GSI during the year and depending on gonad maturity. The maximum values of the HSI are typical for walleye pollock and Pacific cod individuals with the gonads of the III stage of maturity. The maximum values of the index in saffron cod are found in mature individuals with immature gonads. The minimum values are demonstrated by the fish with the gonads at the stage of final spawning or of post-spawning recovery. During the annual reproduction cycle males and females of walleye pollock and cod realize different scenarios of spending and accumulating liver fat. Whereas the maximum HSI is observed in the fish with the gonads at the III maturity stage, the minimum values in males are typical for individuals with smelting gonads, and in females – on finishing the spawn. That can be connected to possible feeding for the individual. Liver weight and liver index can increase in males just shortly after finishing spawning, in females that is found only at the stage of post-spawning recovery.
About the Author
N. P. Sergeeva
Kamchatka Branch of Russian Research Institute of Fisheries and Oceanography (“KamchatNIRO”)
Russian Federation
Russian Federation
Leading Specialist
683000 Petropavlovsk-Kamchatsky, Naberezhnaya Str., 18
Tel.: +7 (4152) 42-57-96
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For citations:
Sergeeva N.P. The dynamics of the liver weight and liver indices in the course of gonad maturation of gadid species on Eastern Kamchatka. The researches of the aquatic biological resources of Kamchatka and the North-West Part of the Pacific Ocean. 2020;(59):5-26. (In Russ.) https://doi.org/10.15853/2072-8212.2020.59.5-26
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