Cyclical changes in the ovary of the catfish &lt;i&gt;Clarias batrachus&lt;/i&gt; (Linn.)

Lehri, G.K.

doi:10.1159/000143067

Cited by 27 publications

(18 citation statements)

References 7 publications

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“…As in Clarias batrachus (Lehri, 1967(Lehri, , 1968 and in Heteropneustes fossilis (Sundararaj and Vasal, 1976), spermatogenesis and vitellogenesis in feral Clarias gariepinus are resumed in late winter and early spring, when the water temperatures are relatively low, but increasing daily. During that time of year Viveen (unpublished results) observed sunbathing of catfish in very shallow and warm (28°C) water of the Hula Nature Reserve at midday.…”

Section: Discussionmentioning

confidence: 99%

Annual correlative changes in gonads and pituitary gonadotropes of feral African catfish, Clarias gariepinus

et al. 1987

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Section: Discussionmentioning

confidence: 99%

Annual correlative changes in gonads and pituitary gonadotropes of feral African catfish, Clarias gariepinus

et al. 1987

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“…However, the presence of synaptonemal complexes in oocytes located within the germinal epithelium of common snook when the fish was not reproductive, but regressed, indicates that meiosis occurs year-round, even at the nadir of the reproductive cycle. Consequently, Lehri's (1968) use of the term "resting phase" for portions of the annual reproductive cycle is unwarranted. Throughout the annual reproductive cycle, even when common snook are regressed, there is recruitment of oocytes from the germinal epithelium into the stromal compartment of the ovarian lamellae.…”

Section: Identifying Germ Cellsmentioning

confidence: 99%

“…Previous studies conducted using paraffin embedment for ovarian histology obscured histological relationships (Wallace and Selman, 1990). It has been suggested that oocytes are derived from either the luminal epithelium (Bullough, 1942;Mendoza, 1943;Tromp-Blum, 1959;Beach, 1959;Lehri, 1968) or from the underlying ovarian stroma (Brummett et al, 1982). The problem with studying the origin of oocytes in the ovary is that the cellular detail required for adequate de- OF MORPHOLOGY 243:265-281 (2000) scription is not resolvable with light microscopy.…”

mentioning

confidence: 99%

Ovarian germinal epithelium and folliculogenesis in the common snook,Centropomus undecimalis (Teleostei: Centropomidae)

2000

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The ovarian germinal epithelium in the common snook, Centropomus undecimalis, is described. It consists of epithelial and prefollicle cells that surround germ cells, either oogonia or oocytes, respectively. The germinal epithelium borders a body cavity, the ovarian lumen, and is supported by a basement membrane that also separates the epithelial compartment of the ovarian lamellae from the stromal compartment. During folliculogenesis, the epithelial cells, whose cytoplasmic processes encompass meiotic oocytes, transform into prefollicle cells, which become follicle cells at the completion of folliculogenesis. The follicle is a derivative of the germinal epithelium and is composed of the oocyte and surrounding follicle cells. It is separated from the encompassing theca by a basement membrane. The cells that form the theca interna are derived from prethecal cells within the extravascular space of the ovarian stroma. The theca externa differentiates from undifferentiated cells within the stromal compartment of the ovary, from within the extravascular space. The theca interna and the theca externa are not considered to be part of the follicle and are derived from a different ovarian compartment than the follicle. Meiosis commences while oocytes are still within the germinal epithelium and proceeds as far as arrested diplotene of the first meiotic prophase. The primary growth phase of oocyte development also begins while oocytes are still within the germinal epithelium or attached to it in a cell nest. The definitions used herein are consistent between sexes and with the mammalian literature. J. Morphol. 243:265–281, 2000 © 2000 Wiley‐Liss, Inc.

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“…Some of the earlier workers on fish oocytes failed to detect nucleolar extrusions (Wallace 1904, Nath and Nangia 1931, Nath et al 1944) and though nucleolar extrusion has been claimed by others but without its active participation in yolk formation (Stromasten 1931, Narain 1937, Choudhary 1951, Rai 1967and Lehri 1968. Yamamoto (1956) and Bara (1960) suggested nucleolar extrusions to be associated with cell metabolism.…”

Section: Discussionmentioning

confidence: 98%

Studies on the formation of compound yolk in the developing oocytes of an air-breathing fish Channa punctatus (Bloch).

1979

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show abstract

Cyclical changes in the ovary of the catfish <i>Clarias batrachus</i> (Linn.)

Cited by 27 publications

References 7 publications

Annual correlative changes in gonads and pituitary gonadotropes of feral African catfish, Clarias gariepinus

Annual correlative changes in gonads and pituitary gonadotropes of feral African catfish, Clarias gariepinus

Ovarian germinal epithelium and folliculogenesis in the common snook,Centropomus undecimalis (Teleostei: Centropomidae)

Studies on the formation of compound yolk in the developing oocytes of an air-breathing fish Channa punctatus (Bloch).

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