Sexual dimorphism of the flounder <i>Bothus robinsi</i> (Pisces: Bothidae)

Kobelkowsky, Abraham

doi:10.1002/jmor.10218

Cited by 12 publications

(13 citation statements)

References 11 publications

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“…This type of polymorphism, known as sexual dimorphism, occurs mainly in males. They may be different from females with regard to body size, coloration and morphology of the fins (Kobelkowsky, 2004;Giacomello and Rasotto, 2005;Casatti et al, 2006). Some fish color patterns are dependent on pigments, such as carotenoids.…”

Section: Bry-sp1-3 T T T T T T T C T C T C C T C C T T G T T -C -mentioning

confidence: 99%

Molecular variability in Brycon cf. pesu Muller and Troschel, 1845 (Characiformes: Characidae) from the Araguaia-Tocantins Basin

Panarari-Antunes

Prioli

Prioli³

et al. 2008

Genet. Mol. Res.

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AbSTRACT. Brycon pesu is a small-sized fish distributed throughout the Amazon and Orinoco Basins and other coastal basins of northeastern South America. Brycon cf. pesu specimens from the Araguaia-Tocantins Basin are currently separated into two morphotypes, Brycon sp1 and Brycon sp2, owing to different coloration of their anal fin. Brycon sp2 has a reddish margin stripe on the anal fin which morphologically distinguishes it from Brycon sp1. In the present research, nuclear and mitochondrial markers were used to test the hypothesis that the Brycon sp1 and Brycon sp2 morphotypes are distinct species. Specimens from the two morphotypes were collected from the Lajeado Hydroelectric Plant and the Palmas River in the AraguaiaTocantins Basin. Thirty-five loci obtained by the amplification of five inter-simple sequence repeat primers were analyzed but no species-specific bands were detected. Electrophoretic profiles obtained from 5S rDNA non-transcribed spacer amplification failed to show any differentiation in morphotypes. These results were corroborated by nucleotide sequence analysis of the mtDNA control region, in which 24 polymorphic nucleotide sites, representing a polymorphism rate of only 5%, were detected. The low rates of polymorphism detected by inter-simple sequence repeat, non-transcribed spacer and mtDNA D-loop markers strongly reject the hypothesis that the two morphotypes Brycon sp1 and Brycon sp2 represent distinct species within Brycon cf. pesu. Further studies are needed to obtain conclusive data on the notion that the coloration of the anal fin is an intraspecific polymorphism, possibly related to environmental factors.

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Section: Bry-sp1-3 T T T T T T T C T C T C C T C C T T G T T -C -mentioning

confidence: 99%

Molecular variability in Brycon cf. pesu Muller and Troschel, 1845 (Characiformes: Characidae) from the Araguaia-Tocantins Basin

Panarari-Antunes

Prioli

Prioli³

et al. 2008

Genet. Mol. Res.

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“…Although studies on reproductive biology are numerous, articles about gonads morphology are scarce. Teleostean gonads (ovaries and testes) are in general described by Gérard (1954); Young (1962); Romer (1962); Lagler et al (1977), Chiasson (1980), and Nagahama (1983), whereas ovaries in particular, are studied by Dodd (1977), Begovac & Wallace (1987), Selman et al (1991), Kobelkowsky & Alva-García (2000), Parenti & Grier (2004), Uribe et al (2005), and Kobelkowsky (1999Kobelkowsky ( , 2000Kobelkowsky ( , 2004Kobelkowsky ( , 2005. Among the scarce articles dealing with the ovarian germinal epithelium, is that of Grier (2000) in a representative of the Centropomidae.…”

Section: Introductionmentioning

confidence: 98%

Morphological Diversity of the Ovaries of the Mexican Teleost Fishes

Kobelkowsky¹

2012

Int. J. Morphol.

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SUMMARY:The morphological diversity of the ovaries from a total of 90 species of teleosts in the Mexican fauna was analyzed. Ovaries were classified according to the following characters: their number, symmetry, fusion grade, trajectory, cross section, and topographical location. The fusion of both left and right ovaries was the character showing most diversity, mainly in the Cyprinodontiformes and its tendency to the viviparity. However, the most notably character was the extravisceral development of the ovaries in the Pleuronectiformes, implying the forward orientation of the gonoduct and the forward position of the female genital opening. The urogenital system of a typical perciform, Bairdiella chrysoura is proposed as a morphological pattern of the Teleostei.

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“…In teleosts, for example, female flounder are larger than males (2,3), whereas in tilapia, males are the larger sex (4). However, although these sexual differences in body size may be related to their reproductive organs, the mechanisms underlying sexually dimorphic body growth have not been determined.…”

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confidence: 99%

Gonads directly regulate growth in teleosts

Bhatta

Iwai

Miura

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

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In general, there is a relationship between growth and reproduction, and gonads are known to be important organs for growth, but direct evidence for their role is lacking. Here, using a fish model, we report direct evidence that gonads are endocrine organs equal to the pituitary in controlling body growth. Gonadal loss of function, gain of function, and rescue of growth were investigated in tilapia. Gonadectomy experiments were carried out in juvenile males and females. Gonadectomy significantly retarded growth compared with controls; however, this retardation was rescued by the implantation of extirpated gonads. Because gonads express growth hormone, it is possible that gonads control body growth through the secretion of growth hormone and/or other endocrine factors. We propose that gonads are integral players in the dynamic regulation of growth in teleosts.

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Sexual dimorphism of the flounder Bothus robinsi (Pisces: Bothidae)

Cited by 12 publications

References 11 publications

Molecular variability in Brycon cf. pesu Muller and Troschel, 1845 (Characiformes: Characidae) from the Araguaia-Tocantins Basin

Molecular variability in Brycon cf. pesu Muller and Troschel, 1845 (Characiformes: Characidae) from the Araguaia-Tocantins Basin

Morphological Diversity of the Ovaries of the Mexican Teleost Fishes

Gonads directly regulate growth in teleosts

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