Production of ZZ females in the female-heterogametic black molly, Poecilia sphenops, by endocrine sex reversal and progeny testing

George, Teena P.; Pandian, T. J.

doi:10.1016/0044-8486(95)01035-1

Cited by 26 publications

(9 citation statements)

References 12 publications

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“…This genetic mechanism usually occurs in one of two forms: heterogametic male (XY) or heterogametic female (WZ). The former occurs in some salmonids (Jørstad and Naevdal, 1996;Donaldson, 2000) and channel catfish Ictalurus punctatus (Rafinesque) (Patiño et al, 1996) and is determined at fertilization, while the §Author to whom correspondence should be addressed at present address: Department of Fisheries and Aquaculture, Government (George & Pandian, 1995) and rosy bitterlings Rhodeus ocellatus ocellatus Kner (Kawamura, 1998) and is determined at ovulation. Still other forms, such as WXY [platyfish Xiphophorus maculatus (Gü nther)] occur, exhibiting the wide variety of sex determination mechanisms in fishes (Nakamura et al, 1984).…”

Section: Introductionmentioning

confidence: 99%

Gonadal sex differentiation in Atlantic halibut

Hendry¹

2002

Journal of Fish Biology

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The process of gonadal sex differentiation in 338 Atlantic halibut Hippoglossus hippoglossus larvae, ranging in size from 10 mm L S to 230 mm L F , is described histologically. Gonadal sex differentiation occurred by 38·0 mm L F , which coincided with the weaned, post-metamorphic, settled stage in the life cycle. This was a gradual process that coincided with other organogenesis in the developing larvae.

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Section: Introductionmentioning

confidence: 99%

Gonadal sex differentiation in Atlantic halibut

Hendry¹

2002

Journal of Fish Biology

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“…Thus, female homogamety (XX) was demonstrated in the chinook salmon Oncorhynchus tshawytscha (Walbaum) , the catfish Ictalurus punctatus (Rafinesque) (Davies et al, 1990), the Siamese fighting fish Betta splendens Regan (Kavumpurath & Pandian, 1992), the guppy Poecilia reticulata (Peters) (Kavumpurath & Pandian, 1993), and the tilapia Oreochromis niloticus L. (Jalabert et al, 1974). Likewise, female heterogamety (ZW) was demonstrated in another tilapia Oreochromis aureus Steindachner (Hopkins et al, 1979) and in a poecilid Poecilia sphenops Cuvier & Valenciennes (George & Pandian, 1995).…”

Section: Introductionmentioning

confidence: 99%

Sex ratios in offspring of sex‐reversed sea bass and the relationship between growth and phenotypic sex differentiation

Blázquez

Carrillo

Zanuy

et al. 1999

Journal of Fish Biology

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Groups of sexually undifferentiated sea bass Dicentrarchus labrax were fed with the androgen 17 -methyltestosterone (MT) during sex differentiation. MT treatment increased males from 79 3% in the controls (the usual 3 : 1 male : female sex ratio of cultured sea bass) to 100 0%, implying that in the treated groups one out of each five resulting males was a masculinized female (neomale). Thirteen males from the MT treated groups were taken as the parental generation and their sperm used to individually fertilize a pool of eggs from unrelated females. The probability of having at least one neomale was 95% and most probably two or three of the males used were neomales. The offspring from each family were reared separately under the same environmental conditions. Samples were taken at 11 and 15 months of age, during and after sex differentiation, respectively. Results showed that females predominated among the larger fish whereas males and undifferentiated fish predominated among the smaller ones. Intersexes exhibited an intermediate size. All fish with a body length smaller than 12 cm were undifferentiated. These results suggest that sex differentiation is more dependent on length than on age. At 15 months, sex ratios were male-biased in all families, except one (females ranged from 5 to 50%) and only two families had sex ratios not significantly different from 1 : 1, suggesting that the mechanism of sex determination in the sea bass is not of a XX/XY or ZW/ZZ type since no family exhibited a female-biased progeny, as would be expected from both types. Results support the hypothesis that factors other than genetic, i.e., environmental, may act epigenetically on the sex determination mechanisms of sea bass, as has been demonstrated in other fishes. 1999 The Fisheries Society of the British Isles

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“…At 30 °C it took less time (126 days) than at 22 and 26 °C; in these groups the specimens required 151–154 days to reach sexual maturity. Marañón, Maya & Salgado (1999), Kavumpurath & Pandian (1993) and George & Pandian (1995) consider that reproductive age of poecilid fish was reached after 60, 90 and 210 days respectively.…”

Section: Resultsmentioning

confidence: 99%

Environmental factors and sexual differentiation in Poecilia sphenops Valenciennes (Pisces: Poeciliidae)

Barón¹,

Bückle²,

Espina

2002

Aquaculture Research

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Because environmental factors play an important role in the sexual proportions in fish and given that the studies that evaluate the interactions of such factors are scarce, the purpose of this work was to determine the combined effect of pH/temperature (23, 26 and 29 °C; pH 6, 7 and 8) on sex determination of Poecilia sphenops Valenciennes. The trial started with newborn organisms (n = 180) that were maintained in aquaria for 6 months until they could be separated by sex. Afterwards, nine groups of four females (0.81–1.48 g) and two males (0.36–0.63 g) were distributed in 20‐L aquaria until fertilization, gestation and offspring birth took part. The offspring were grown under the same conditions until they reached sexual maturity. The results indicated the strong interaction of the factors (P < 0.05) with a lower male/female ratio at pH 7 both at 23 °C (M/F = 0.12) as well as at 30 °C (M/F = 0.10) and higher ratios at pH 8 at similar temperatures (M/F = 0.7) to 23 °C and (M/F = 0.6) to 26 °C. The females dominated in all the combinations; the least favourable combinations were 23 and 26 °C at pH 8 with 0.7 and 0.6 M/F ratios respectively. The results obtained in the laboratory explain very closely the behaviour of the population of P. sphenops from Oaxaca in the natural environment that can be used in aquaculture for baitfish production and also for aquaculture purposes.

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Production of ZZ females in the female-heterogametic black molly, Poecilia sphenops, by endocrine sex reversal and progeny testing

Cited by 26 publications

References 12 publications

Gonadal sex differentiation in Atlantic halibut

Gonadal sex differentiation in Atlantic halibut

Sex ratios in offspring of sex‐reversed sea bass and the relationship between growth and phenotypic sex differentiation

Environmental factors and sexual differentiation in Poecilia sphenops Valenciennes (Pisces: Poeciliidae)

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