Oocyte growth and development in teleosts

Tyler, Charles R.; Sumpter, John P.

doi:10.1007/bf00122584

Cited by 661 publications

(510 citation statements)

References 146 publications

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“…In L. lentiginosa, as in the majority of the teleosts, were the largest cells of this lineage, which presented individualized and spherical yolk granules in the ooplasm. This two stages, previtellogenic and vitellogenic oocytes, of L. lentigosa were related as secondary oocyte growth for TYLER & SUMPTER (1996) that is gonadotrophic-dependent.…”

Section: Discussionmentioning

confidence: 90%

“…In L. lentiginosa, the yolk nucleus appeared as a conspicuous, strongly basophilic structure, that initially was located next to the nucleus and then moved to the periphery where it dispersed as fine granules, as observed by BAZZOLI & GODINHO (1995). The two oocytary stages, early and advanced perinucleolar, of L. lentiginosa relates to the primary oocyte growth described for TYLER & SUMPTER (1996), characterized by a period of intense RNA synthesis and not gonadotrophic-dependent. In L. lentiginosa previtellogenic oocytes were characterized by the presence of cortical vesicles in the ooplasm, which, according to MICALE et al (1999), release their glycoprotein content in the perivitelline space during fertilization, as a polyspermic inhibiting mechanism.…”

Section: Discussionmentioning

confidence: 95%

“…In general, most published work focuses on biometrical, morphological, physiological and/ or biochemical characters, and the distribution of the different cytoplasmic and nuclear inclusions (TYLER & SUMPTER 1996, GRIER 2000. LEGENDRE et al (1996) reports that some Siluriformes species present fringed testes while others do not.…”

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confidence: 99%

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Gonadal structure and gametogenesis of Loricaria lentiginosa Isbrücker (Pisces, Teleostei, Siluriformes)

Guimarães-Cruz

Santos

2005

Rev. Bras. Zool.

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ABSTRACT. The gonadal structure and gametogenesis of Loricaria lentiginosa Isbrücker, 1979 were studied through anatomical and histological techniques. Forty two males and ten females in maturation/mature stage were captured in the reservoir of Porto Colombia, Paraná river basin, Minas Gerais, using gill nets, from November 2001 to October 2002 (tri-monthly captures). Examination of the testes revealed that they were paired, elongated and not fringed organs. Histologically, the testes presented three distinct regions: cranial espermatogenic; transistion espermatogenic and secretory; and caudal exclusively secretory. Standard histochemical techniques detected neutral glycoproteins from the secretion of the tubules of the caudal region. Espermatogenesis occurred in cysts throughout the whole extension of the wall of the seminiferous tubules, which anastomosis themselves and liberated the spermatozoa into the lumen of the espermatic ducts. The ovaries were paired, saculiformes and, histologically, they presented ovigerous lamellae that contained the cells of ovogenic ancestry. The oocytes were classified into four stages, based on their cytological characteristics and the cell layers that surrounded them. Post-ovulatory follicles and vitelogenic oocytes in the follicular atresia process also were observed.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 95%

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Gonadal structure and gametogenesis of Loricaria lentiginosa Isbrücker (Pisces, Teleostei, Siluriformes)

Guimarães-Cruz

Santos

2005

Rev. Bras. Zool.

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“…During fish oogenesis, most of the maternal RNAs and proteins were thought to transcribe and translate near or after vitellogenic stage (Tyler and Sumpter, 1996), but fSNX are transcribed and translated mainly in the previtellogenic oocytes, as demonstrated by virtual Northern blotting, RT-PCR and Western blotting. In higher vertebrates, a common feature of mRNA is the presence of the sequence AATAAA in the region from 11 to 30 nucleotides upstream of the site of polyA(q) addition (Gui et al, 1994), but the fSNX has three putative polyadenylation signal (AATAAA) sequences.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, along with the development of biotechnology, the investigation of fish oogenesis has been recognized as important research field (Selman et al, 1993;Tyler and Sumpter, 1996;Nagahama et al, 1995). However, there are many blind spots in the study of fish oogenesis.…”

Section: Introductionmentioning

confidence: 99%

cDNA cloning and characterization of a novel SNX gene differentially expressed in previtellogenic oocytes of gibel carp

Wen

Xie

Gui

2003

Comparative Biochemistry and Physiology Part B: Biochemistry an

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Gonadal development and plasma steroid levels during pubertal development in captive-reared striped bass,Morone saxatilis

Holland¹,

Hassin²,

Zohar³

2000

J. Exp. Zool.

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Puberty is the period during which full sexual development occurs and the capacity to reproduce is acquired. Despite its importance, our understanding of the endocrine regulation of puberty in lower vertebrates is still limited. The objective of the present study was to describe the changes in gonadal development and plasma steroid levels in a relatively late maturing species, the striped bass, during the first four years of life. In about 65% of the females, puberty was initiated during the third year. Although gonadosomatic index (GSI) and oocyte diameter increased during this year, this first cycle was characterized by a heterogeneous population of developing oocytes, a relatively low mean maximum oocyte diameter, and an absence of yolk granules in the oocytes. Plasma 17β‐estradiol (E2) levels were low in all three‐year‐old fish, suggesting that an insufficient stimulation of vitellogenin production by E2 may underlie the lack of vitellogenin incorporation into developing oocytes. All monitored parameters increased during the fourth year, but were still below the values attained by older females. In about 60% of the males, puberty was initiated during the first year and all males were mature by the third year. During the first two years, several immature males initiated spermatogenesis without reaching full maturity. In mature males, mean GSI, plasma testosterone, and 11‐ketotestosterone levels increased simultaneously, reaching higher values each subsequent year. Our results indicate that, similar to the situation in mammals, more than one reproductive cycle is required in striped bass before complete adulthood is reached. J. Exp. Zool. 286:49–63, 2000. © 2000 Wiley‐Liss, Inc.

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Oocyte growth and development in teleosts

Cited by 661 publications

References 146 publications

Gonadal structure and gametogenesis of Loricaria lentiginosa Isbrücker (Pisces, Teleostei, Siluriformes)

Gonadal structure and gametogenesis of Loricaria lentiginosa Isbrücker (Pisces, Teleostei, Siluriformes)

cDNA cloning and characterization of a novel SNX gene differentially expressed in previtellogenic oocytes of gibel carp

Gonadal development and plasma steroid levels during pubertal development in captive-reared striped bass,Morone saxatilis

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