SEX RATIO IN THE SAILFIN MOLLY, <i>POECILIA LATIPINNA</i>

Snelson, Franklin F.; Wetherington, Jeffrey D.

doi:10.1111/j.1558-5646.1980.tb04819.x

Evolution

1980

DOI: 10.1111/j.1558-5646.1980.tb04819.x

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SEX RATIO IN THE SAILFIN MOLLY, POECILIA LATIPINNA

Franklin F. Snelson¹,

Jeffrey D. Wetherington

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1982

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Cited by 20 publications

(2 citation statements)

References 31 publications

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“…Poeciliid fishes exhibit a wide variety ofsex-determining mechanisms, and primary sex ratios other than 1:1 are not unknown and can be the result of inbreeding (Farr, 1981), polygenic sex determination (Kosswig, 1964), multiple sex chromosomes (Kallman, 1965), autosomal regulatory genes or epistatic factors (Kallman, 1984). Among naturally occuring adult populations of poeciliids, sex ratios other than 1:1 are common, and females usually predominate (Thibault, 1974;Snelson and Wetherington, 1980). Sex chromosomes are known to exist in some poeciliids such as the platyfish, Xiphophorus maculatus (Kallman, 1965), and in the guppy, Poecilia reticulata (Winge, 1930), but neither sex-linked inheritance nor sex chromosomes have been found in Poeciliopsis (Schultz, 1966;Cimino, 1973;Leslie, 1982).…”

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confidence: 99%

GENETIC AND ENVIRONMENTAL BASIS OF VARIABLE SEX RATIOS IN LABORATORY STRAINS OF POECILIOPSIS LUCIDA

Sullivan

Schultz

1986

Evolution

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Abstract. -Skewed sex ratios are common among several species ofPoeciliopsis, a viviparous fish from northwestern Mexico. Since previous, unrelated studies from this laboratory (Angus and Schultz, 1983) suggested that deviation from a I: I sex ratio might be influenced by temperature, two inbred strains of P. lucida were tested for temperature-dependent sex determination by comparing sex ratios of offspring from pregnant females held at different water temperatures. Different sex ratios were produced by the two strains at the same temperature: one strain produced almost all-male offspring at 30°C and female-biased sex ratios at 24°C, while the other strain produced a 1:1 sex ratio at both temperatures. At intermediate temperatures, the labile strain produced sequentially fewer males with decreasing temperatures. The other strain produced a consistent sex ratio regardless of temperature. Poeciliopsis lucida apparently has a genetic polymorphism for temperature-influenced sex determination. An hypothesis is offered for the evolutionary origin of environmental sex determination.

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confidence: 99%

GENETIC AND ENVIRONMENTAL BASIS OF VARIABLE SEX RATIOS IN LABORATORY STRAINS OF POECILIOPSIS LUCIDA

Sullivan

Schultz

1986

Evolution

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“…Small males (below ≈ 30 mm SL), by contrast, did not exhibit pronounced colouration and the dorsal fin elongation of large males. In all colour varieties females dominated over males, which is also typical for poeciliid species (Snelson and Wetherington 1980). The percentage contributions of the three morphs were as following: silver-greenish: 53.9%, black: 31.5%, and black spotted: 14.6%.…”

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confidence: 85%

First confirmed record of an established population of sailfin molly, Poecilia latipinna (Actinopterygii: Cyprinodontiformes: Poeciliidae), in Europe

Koutsikos¹,

Economou²,

Vardakas³

et al. 2017

Acta Ichthyol. Piscat.

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Abstract. The ornamental aquarium trade has been responsible for several introductions of non-indigenous species in freshwater ecosystems. This report confirms the presence of an established non-native molly population in a tectonic, brackish, geothermal lagoon located in Greece (Lake Vouliagmeni near Athens). The Vouliagmeni molly was positively identified as the true sailfin molly, Poecilia latipinna (Lesueur, 1821), using the number of scales around the caudal peduncle as the principal diagnostic character within the sailfin molly species complex. To our knowledge, this is the first documented record of an established sailfin molly population in European waters.

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Population structure, reproduction and laboratory behavior of the introduced Belonesox belizanus (Poeciliidae) in Florida

Turner

Snelson

1984

Environ Biol Fish

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SynopsisThe pike killifish, Belonesox belizanus, is native to Mexico and Central America and was introduced into Dade County, Florida in 1957. This study reports on the structure and reproduction of the Florida population and compares the species with other members of the family Poecihidae. The mean standard length (SL) of mature females was about 103 mm. Most females larger than 75 mm SL contained yolked ova, fertilized eggs, or embryos. Mature males averaged about 72 mm SL, and most males larger than 55 mm SL were mature. The sex ratio was significantly skewed in favor of females among adults, but it did not differ significantly from I : 1 among immature fish. Average brood size was about 99, and there was a significant positive correlation of brood size with size of the parent female. There was no evidence of superfetation. Sizes and weights of embryos and neonates were the largest reported for the family. There was a significant decrease in mean embryo weight as development proceeded, indicating that developing embryos received little or no nutrient input from the maternal system after fertilization, The average interbrood interval of aquarium-held females was 42 days, and females stored viable sperm at least 47 days. Reproduction continued year round in the field. Laboratory-born neonates were immediately piscivorous and exhibited distinctive behavior associated with filling the swimbladder and with avoiding detection by predators.

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SEX RATIO IN THE SAILFIN MOLLY, POECILIA LATIPINNA

Cited by 20 publications

References 31 publications

GENETIC AND ENVIRONMENTAL BASIS OF VARIABLE SEX RATIOS IN LABORATORY STRAINS OF POECILIOPSIS LUCIDA

GENETIC AND ENVIRONMENTAL BASIS OF VARIABLE SEX RATIOS IN LABORATORY STRAINS OF POECILIOPSIS LUCIDA

First confirmed record of an established population of sailfin molly, Poecilia latipinna (Actinopterygii: Cyprinodontiformes: Poeciliidae), in Europe

Population structure, reproduction and laboratory behavior of the introduced Belonesox belizanus (Poeciliidae) in Florida

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