Déterminisme Du Sexe Chez Tilapia Macrochir Et Tilapia Nilotica : Action De La Méthyltestostérone Dans l'ALIMENTATION Des Alevins Sur La Différenciation Sexuelle ; Proportion Des Sexes Dans La Descendance Des Mâles « Inversés »

Jalabert, Bernard; Moreau, J.; Planquette, P.; Billard, Roland

doi:10.1051/rnd:19740501

Cited by 46 publications

(21 citation statements)

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“…In fact, only some species exhibit morphologically differentiated sex chromosomes [6]. In the others, male or female heterogamety was first deduced from results of back crossing individuals obtained by hormonal sex reversion [7], like in tilapias Oreochromis mossambicus [8] and O. niloticus [9], or from artificial gynogenesis like in rainbow trout Oncorynchus mykiss [10]. In tilapias belonging to the genus Oreochromis, the heterogametic sex may be either the male or the female depending on the species.…”

Section: Sexualitymentioning

confidence: 99%

“…This may explain why crossing homogametic males from one species with homogametic females from the other can give monosex male F1 offspring, an interesting result for tilapia fish farming since monosex male populations are expected to express a better growth rate without growing in number [11]. However, sex-ratio results from the back crosses between F1 and parent species suggest that the genetic determination system might not be so simple [9,11]. Recent data actually confirm that sex chromosomes of O. niloticus, although identified by in situ hybridation techniques, are still weakly differentiated [12,13], and that sex determining genes can be localised on other chromosomes [14].…”

Section: Sexualitymentioning

confidence: 99%

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Particularities of reproduction and oogenesis in teleost fish compared to mammals

2005

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-Compared to mammals, teleost reproduction presents many original features. Reproductive strategies of species are diversified into numerous adaptations to a large variety of aquatic environments. This diversity may concern sexuality, spawning and parental behaviour, sensitivity to environmental factors, and specific features of gametogenesis such as the duration of vitellogenesis, and egg morphology. Sexuality presents a variety of natural modalities, from gonochorism to hermaphrodism. The absence of definitive arrest of body growth in the adult of most species gives a particular interest to the practical control of growth-reproduction interactions. Vitellogenesis, which represents an important metabolic effort for the maternal organism, involves the synthesis of vitellogenin, a specific glycolipo-phosphoprotein produced in the liver under estradiol stimulation, and its incorporation into oocytes by a receptor mediated process. Both estradiol synthesis in follicle cells and vtg uptake by vitellogenic follicles appear to be mainly controlled by FSH. Oocyte maturation is directly triggered by a progestin, or MIS (maturation inducing steroid) synthesised in follicle cells mainly under LH control, and acting through the non-genomic activation of a membrane receptor. Practical applications of some of these particularities result mainly from the external character of the fertilisation process and of embryonic development, which allows manipulating respectively egg chromosome stocks and sex differentiation. Moreover, the sensitivity of sex differentiation to exogenous factors favours the development of practical methods to control the sex of farmed populations. Finally, the sensitivity of reproductive mechanisms to xenobiotics has led to various kinds of bioassays for putative pollutants.reproductive strategies / sexuality / spawning / vitellogenesis / oocyte maturation / fertilisation

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Section: Sexualitymentioning

confidence: 99%

Section: Sexualitymentioning

confidence: 99%

Particularities of reproduction and oogenesis in teleost fish compared to mammals

2005

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“…L'utilisation du développement gonadique se traduit par la formation de gonades à cellules germinales en nombre réduit (Takahashi et Takano, 1971 ;Okada et al, 1979 ;Yu et al, 1979), ou de gonades complètement stériles (Yoshikawa et Oguri, 1978a, b ;Laird et al, 1978 ;Jalabert et al, 1974b ; McBride, 1975 ;Goetz et al, 1979 ;Yu et al, 1979), ou encore par l'absence de toute ébauche génitale unilatérale (Takahashi, 1975b). Des androgènes (méthyltestostérone) ont surtout été utilisés chez les Salmonidés (Yamazaki, 1976 ;Simpson, 1976 ;Johnstone et al, 1979a,b ; (Yoshikawa et Oguri, 1978b), Tilapia aurea (Eckstein et Spira, 1965), le Carassin (Takahashi et Takano, 1972), la Truite (Ashby, 1957 ;Jalabert et al, 1975 ;Simpson, 1976 ;Johnstone et al, 1979a) (1969), Chan (1970), Harrington (1974,1975) Lepori (1980), et surtout Reinboth (1970,1980,1982 (Atz, 1964 ;Ohno, 1979) et une telle démonstration de la théorie hormonale n'a pas encore été apportée chez les Poissons (Hackmann et Reinboth, 1974 (Wachtel, 1977), femelle (ZW), chez les Oiseaux (Shalev et a/., 1978), chez des Reptiles (Pieau et al, 1979 ; et chez d'autres Amphibiens (Dournon et Zaborski, 1979a,b Muges (Bruslé, 1982).…”

unclassified

La gonadogenèse des Poissons

Brusle¹,

Bruslé²

1983

Reprod. Nutr. Dévelop.

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“…In the genus Oreochromis, both male homogamety (ZZ/WZ) and female homogamety (XX/XY) have been proposed, based on experimental sex ratios from intraspecific crosses, involving normal or sex-reversed parents (Clemens and Inslee, 1968;Jalabert et al, 1974;Guerrero, 1975;Jensen and Shelton, 1979). Experimental results have demonstrated that monosex progeny were obtained when sex-reversed fish of the homogametic sex were mated with normal fish of the same sex genotype (Clemens and Inslee, 1968 in O. mossambicus;Yamamoto, 1969 in Oryzia latipes; Jalabert et al, 1974 in O. niloticus).…”

Section: Introductionmentioning

confidence: 99%

Inheritance of sex in two ZZ pseudofemale lines of tilapia Oreochromis aureus

Desprez

Mélard

Hoareau³

et al. 2003

Aquaculture

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This paper reports a study on the sex determination system of the blue tilapia, Oreochromis aureus. Investigations were carried out using a pseudofemale line in two populations of O. aureus, known as Egyptian Population (EP) and Israel Population (IP). In O. aureus, males are the homogametic sex (ZZ/ZW), and sex reversal of fry with estradiol results in the production of some functional sexreversed fish with a female phenotype and ZZ male genotype, known as pseudofemales or D-females. Crosses between ZZ pseudofemales and ZZ males theoretically should provide monosex ZZ male progeny only. We have studied the sex ratios of progeny from 43 IP (F 2 to F 3 generations) and 51 EP (F 1 to F 5 generations), pair-matings between normal males and pseudofemales. In IP, the male percentage in progenies ranged between 83% to 100% in F 2 and 66% to 100% in F 3 . In EP, male percentage was more constant, varying from 88% to 100% in F 1 , from 96% to 100% in F 3 and from 97% to 100% in F 5 . In EP, F 2 and F 4 pseudofemales produced only monosex male progeny. This apparent difference in sex ratio frequency distributions between the two O. aureus pseudofemale lines could be due to the selection of males. EP pseudofemales were mated with their siblings for F 2 and F 3 pseudofemales or with closely related males for F 4 and F 5 pseudofemales. Conversely, IP pseudofemales were crossed with nonrelated males originating from research center broodstock, resulting in a higher proportion of females in sex ratio of progenies from successive generations of pseudofemales. The role of inbreeding is discussed in the context of predominantly monofactorial sex chromosome determination system operating in this species, influenced by other factors (genetic and environmental). The present study also shows that it is possible to fix the male sex determining factors

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Déterminisme Du Sexe Chez Tilapia Macrochir Et Tilapia Nilotica : Action De La Méthyltestostérone Dans l'ALIMENTATION Des Alevins Sur La Différenciation Sexuelle ; Proportion Des Sexes Dans La Descendance Des Mâles « Inversés »

Cited by 46 publications

References 0 publications

Particularities of reproduction and oogenesis in teleost fish compared to mammals

Particularities of reproduction and oogenesis in teleost fish compared to mammals

La gonadogenèse des Poissons

Inheritance of sex in two ZZ pseudofemale lines of tilapia Oreochromis aureus

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