Gametogenesis of Rainbow Trout Parasalmo mykiss Cultivated from Hatching to Sexual Maturity at a Temperature of Approximately 20°С

— Gonadal development during the first reproductive cycle is studied in rainbow trout Parasalmo mykiss cultivated at approximately 20°С. The cultivation of the fish at this temperature leads to an increasing proportion of lipid and stromal tissue in ovaries, decrease of the number of previtellogenou...

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Bibliographic Details
Published inJournal of ichthyology Vol. 59; no. 1; pp. 78 - 89
Main Authors Zelennikov, O. V., Golod, V. M.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 2019
Springer Nature B.V
Subjects
Biomedical and Life Sciences
Cultivation
Females
Fish
Freshwater fishes
Gametogenesis
Hatching
Life Sciences
Lipids
Males
Maturation
Maturity
Oncorhynchus mykiss
Oocytes
Ovaries
Reproductive cycle
Sexual maturity
Spermatogenesis
Spermatozoa
Temperature
Tissue
Zoology
spermatogenesis
oocyte resorption
rainbow trout
sexual maturity
oogenesis
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Summary:— Gonadal development during the first reproductive cycle is studied in rainbow trout Parasalmo mykiss cultivated at approximately 20°С. The cultivation of the fish at this temperature leads to an increasing proportion of lipid and stromal tissue in ovaries, decrease of the number of previtellogenous oocytes, and to subsequent retardation of sexual maturation in the majority of females. At the age of 2 years, only 36.6% of the fishes reach sexual maturity. Shortly before sexual maturity, total resorption of oocytes of the older generation close to definitive condition is observed. In the males, the period of the beginning of active spermatogenesis wave is substantially protracted. Total resorption of mature spermatozoa is registered in all males just before sexual maturity.
ISSN:0032-9452
1555-6425
DOI:10.1134/S0032945219010181