Oogenesis inhibition, plasma steroid levels, and morphometric changes in the hypophysis in Russian sturgeon (Acipenser gueldenstaedti Brandt) exposed to low environmental pH

Zelennikov, O. V.; Mosyagina, M.V.; Fedorov, K. E.

doi:10.1016/s0166-445x(98)00113-1

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…Как известно, половые железы у молоди осетровых рыб отличаются топографическим разобщением генеративной, стромальной и жировой частей. При этом жировая часть может во много раз превосходить генеративную и стромальную части вместе взятые (Ахундов [Achundov] 1991;Zelennikov et al 1999).…”

Section: результаты и обсуждениеunclassified

Special features of ultrastructural organization steroid-secretory cells in the gonads of juveniles of cyclostomes and fishes

Mosyagina

Zelennikov

2019

Proceedings ZIN

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The comparative ultrastructural analysis of steroid-secretory cells (SC) in gonads of youngs lamprey Lampetra fluviatilis (Linnaeus 1758), Siberian sturgeon Acipenser baerii Brandt 1869, sterlet A. ruthenus Linnaeus, 1758, rainbow trout Oncorhynchus mykiss (Walbaum 1792) and pink salmon Oncorhynchus gorbuscha (Walbaum 1792) at similar stages of gametogenesis was carried out. The SC localization and size, the diameters of mitochondria, tubules of agranular reticulum, lipid inclusions and also the relative volume density of these structures were determined and calculated. It is concluded that localization of SC in gonads and their activity changes are closely related to the processes of sex differentiation and the growth of oocytes. Thus, in females of all studied species there was a change in SC localization in the direction of stroma→theca→granulosa of previtellogenic oocytes with a simultaneous increase of their secretory activity (increase in SC size, size and volume density of mitochondria and of agranular endoplasmic reticulum tubules). In males, during gametogenesis, the SC localization also changed in the direction of epithelium→stroma testicular with an increase of their secretory activity. In this case, the largest and most active SC were found in the stroma of pink salmon testicular during the natural sex inversion. At the same time, however, were revealed differences in SC ultrastructural organization, appeared to be of species-specific nature. The highest average diameter of the agranular endoplasmic reticulum tubules was observed in sturgeon SC and they are characterized by a large number of lipid inclusions in early stages of gametogenesis. This should be taken into account when comparatively analysing of quantitative data in fish of different systematic groups.

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Section: результаты и обсуждениеunclassified

Special features of ultrastructural organization steroid-secretory cells in the gonads of juveniles of cyclostomes and fishes

Mosyagina

Zelennikov

2019

Proceedings ZIN

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“…Определение численности ооцитов таким образом предусматривает экстраполяцию данных и, соответственно, закладывает ошибку, величина которой может быть значительной и для разных видов рыб различной. К тому же в основе такого подсчета лежат конкретные измерения и подсчеты клеток, которые можно сами по себе использовать для сравнения состояния гонад у рыб (Zelennikov 1997;Zelennikov et al 1999).…”

Section: материал и методыunclassified

Gametogenesis of the Pacific salmon. 3. Comparative analysis of the state of gonads in juvenile Pacific salmon due to fertility formation

Zelennikov

2019

Proceedings ZIN

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The ovarian condition was studied in juveniles of six species of the Pacific salmon of different ages, taken for research at four hatcheries, as well as captured in lakes and rivers in the Sakhalin Province and Kamchatka Territory. The formation of the older generation of germ cells, consisting of previellogenic oocytes, in females of the Pacific salmon ends at the age of 0+, in pink salmon, with a mass of about 0.2–0.3 g, in other species, with a mass of about 1–2 g. In all species, the replenishment of this generation ceases during the habitat of juvenile fish in fresh water. After the formation of the older generation of germ cells is completed and its number reaches a certain level characteristic of each fish species, two oogenesis processes, that are not externally related to each other, continue to be carried out in the ovaries. The first process is the growth of the older generation oocytes, which develop relatively synchronously, varying 1.5–2 times in diameter. The second process is the mitotic reproduction of the gonies, their entry into meiosis, and subsequent resorption at the stage of pachytene and early diplotene. The mitotic activity of the gonies is minimal in females of the pink salmon, and, in fact, it is not detected in the fish caught in the coast. In females of other species, a decrease in both mitotic activity and initiation of new meiotic cycles does not occur during the entire period of their habitat in fresh water.

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“…Não apenas os metais, mas o pH ácido de forma isolada, pode ser capaz de alterar a capacidade reprodutiva em peixes (Sangalang, 1990), causando alterações como aumento da concentração plasmática de T, ou atraso no desenvolvimento em fêmeas juvenis de esturjão russo (Acipenser gueldenstaedti Brandt) (Zelennikov et al, 1999), entre outros efeitos que podem atingir diretamente a capacidade de sucesso reprodutivo dos organismos. A precipitação ácida tem causado a redução e extinção de população de salmão no sul da Noruega desde o fim do século 19 (Sandoy e Langaker, 2001).…”

Section: Desreguladores Endócrinosunclassified

“…Já a T, embora menos efetiva que o 11-KT, também participa da espermatogênese e estimula a atividade hipotalâmica e hipofisária, e consequentemente, nesse caso, a ativação dos testículos (Weltzien et al, 2002). Zelennikov et al (1999) possui uma importante participação nas fases iniciais de espermatogênese e renovação celular (Knapp e Carlisle, 2011), no entanto pelo fato desses animais se encontrarem já em uma fase final de maturação, a diminuição desse hormônio sugere uma mobilização principal dos andrógenos. Além disso, há a possibilidade de interferência dos metais e do pH ácido na enzima de conversão aromatase possibilitando o aumento da concentração de T (e 11-KT), e a consequente redução de E 2 (Lawrence et al, 2003).…”

Section: Análises Hormonaisunclassified

Influência do pH ácido, alumínio e manganês na fisiologia reprodutiva em machos de Astyanax bimaculatus (Characiformes: Characidae)

Kida¹

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À FAPESP pela bolsa concedida para a realização do curso de mestrado e ao auxílio financeiro concedido pelo Projeto Temático 2008/57687-0. Ao Projeto Temático "Effects of global climate changes of the brazilian fauna: a conservation physiology approach" (FAPESP, Processo: 2008/57687-0), coordenado pelo Dr. Carlos A. Navas (IB-USP) pelo apoio financeiro durante o desenvolvimento do presente estudo. Ao Danilo Caneppele e à equipe da CESP de Paraibuna pela disponibilização dos animais para a realização deste trabalho. À Dra. Renata Guimarães Moreira Whitton pela orientação, confiança depositada em mim, incentivo, competência e dedicação. Agradeço principalmente a chance de crescer pessoalmente e profissionalmente e por acreditar que eu seria capaz de chegar até aqui.

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Oogenesis inhibition, plasma steroid levels, and morphometric changes in the hypophysis in Russian sturgeon (Acipenser gueldenstaedti Brandt) exposed to low environmental pH

Cited by 9 publications

References 7 publications

Special features of ultrastructural organization steroid-secretory cells in the gonads of juveniles of cyclostomes and fishes

Special features of ultrastructural organization steroid-secretory cells in the gonads of juveniles of cyclostomes and fishes

Gametogenesis of the Pacific salmon. 3. Comparative analysis of the state of gonads in juvenile Pacific salmon due to fertility formation

Influência do pH ácido, alumínio e manganês na fisiologia reprodutiva em machos de Astyanax bimaculatus (Characiformes: Characidae)

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