Intersex in teleost fish: Are we distinguishing endocrine disruption from natural phenomena?

Bahamonde, Paulina; Munkittrick, Kelly R.; Martyniuk, Christopher J.

doi:10.1016/j.ygcen.2013.04.005

Cited by 128 publications

(100 citation statements)

References 94 publications

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“…Explained the importance of characterizing intersex condition in aquatic organisms in order to establish baseline prevalence and factors promoting the development of intersex (Bahamonde, Munkittrick, & Martyniuk, 2013). The intersex condition was first detected in wild populations of roach, but since then, several studies have demonstrated by the appearance of intersex in several fish species, related to EDCs exposure (Bahamonde et al, 2013) including thick lip grey mullets (Chelon labrosus) from the Biosphere Reserve of Urdaibai in the Basque Coast (Puy- Azurmendi et al, 2013). The thicklip grey mullet is a coastal fish of the family Mugilidae, which included around 80 species widely distributed all around the world and occupying numerous habitats (Whitfield, Elliott, Basset, Blaber, & West, 2012).…”

Section: Krishnamoorthymentioning

confidence: 99%

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Dhanasekar¹,

Selvakumar²,

Munuswamy³

2018

Turk. J. Fish. Aquat. Sci.

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The present study documents the occurrence of an intersex condition in a natural population of mullet Mugil cephalus L. On closure examination of the dissected fish, 11 females and 7 males were recorded. Histological observations through the testes indicated that one of the male fish showed different developmental stages of oocytes in between the seminiferous tubules. Interestingly, the condition reported here did not show any internal bilateral division of the reproductive system into male and female components. But it had shown the occurrence of oocytes and spermatozoa throughout the entire region of the testis of a functional male. The observation of intersex testis or testicular oocytes (TO) is of first report from the east coast of India. The fish being catadromous, this condition may be related to possible accumulation of chemical contaminants in the habitat water.

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Section: Krishnamoorthymentioning

confidence: 99%

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Dhanasekar¹,

Selvakumar²,

Munuswamy³

2018

Turk. J. Fish. Aquat. Sci.

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“…A recent review of 48 studies conducted in 24 countries reports intersex findings in at least 37 fish species from 17 families (29). The salmonid species, to which grayling belongs, have also been reported as more sensitive to oestrogenic exposure than the cyprinid fish (30).…”

Section: Histological Findings Of Intersexmentioning

confidence: 99%

Occurrence of intersex in wild freshwater fish in Slovenian rivers: a histological evaluation

Vrecl

Jenčič

2016

Archives of Industrial Hygiene and Toxicology

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The aim of this preliminary research was to establish if there are intersex occurrences in wild freshwater fish in Slovenian rivers and streams. In the first study we evaluated all fish species of both sexes obtained from the river Ljubljanica from its source to mouth. In the second study we focused on the rainbow trout (Oncorhynchus mykiss) and brown trout (Salmo trutta m. fario) males from 30 rivers and streams in different parts of Slovenia. The male gonads were histologically assessed for the presence of oocytes to determine the frequency and degree of intersex. Oocytes were found in the testicular tissue of a single grayling (Thymallus thymallus) and in the adipose tissue adjacent to the testis of a single common barbel (Barbus barbus), both from the Ljubljanica. Several cyst-like structures that resemble degenerated presumptive oocytes were also present in several trout testes. This preliminary report is the first of its kind in Slovenia. To gain a better insight into the intersex issue in Slovenia, we plan to regularly biomonitor freshwater pollution by histologically examining fish gonads and, if possible, by determining vitellogenin plasma levels in fish.

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“…Therefore, intersex disorder should not be confused with natural hermaphroditism. This condition is also referred to the presence of testicular oocytes, testicular follicles, testisova, or ovotestes (Bahamonde et al, 2013), and it has been reported in several teleost species (Devlin & Nagahama, 2002;Godwin, 2010). However, there is no exact causation of intersex and currently under investigation.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…On the other hand, over the last couple of years, in various wild populations of these gonochoristic teleosts increased the prevalence of intersex and it has been identified worldwide and associated with the presence of natural and synthetic endocrine disrupting chemicals (EDCs), such as hormones, its metabolites or chemical pollutants, which reaching aquatic ecosystems with effluents of various origins (Bahamonde et al, 2013). Therewithal, the effects of raising global temperature and unforeseen climatic changes on natural fishery resources may also be linked to the increase of this disorder (Strüssmann & Nakamura, 2002;Bahamonde et al, 2013). Although this association of intersex occurrence with EDCs and/or global temperature, questions remain concerning the prevalence of intersex in wild fish populations and how this might be related to the molecular process events underlying sex determination and/or sex differentiation, and it is a widely discussed topic globally (Nolan et al, 2001;Bahamonde et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: a cytogenetic and morphological study

et al. 2016

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Little is known about reproductive biology of endangered Steindachneridion parahybae, a gonochoristic teleost species inhabiting the Paraíba do Sul River Basin, and herein is the first description of intersex in S. parahybae juvenile. The normal appearance of ovaries and testes in juvenile from the same lot of breeding were also described for comparison, even as cytogenetic analysis was performed in these juveniles. One specimen was a priori classified as female due to the macroscopic characteristic of ovaries, with small yellow oocytes, without fringes (a main characteristic of catfish male), and larger than testes; however the microscopic analysis revealed the presence of ovotestes, including the complete spermatogenesis. S. parahybae had diploid number, 2n = 56 chromosomes with no evidence of differentiated sex chromosomes or supernumerary chromosomes among them. These findings may be due to the result of exposure to endocrine disrupting compounds or may also be influenced by environmental conditions. The possibility of intersexes might also happen spontaneously and it cannot be ruled out. Therefore, the functional significance and reproductive consequences of this anomaly remain to be determined, suggesting that this species may be susceptible to endocrine disruption. These results contribute to gain expertise about reproductive biology of an endangered species in captivity.Poco se sabe sobre la biología reproductiva de Steindachneridion parahybae, una especie de teleósteo gonocorístico en peligro de extinción que habita la cuenca del río Paraíba do Sul y en éste trabajo se describe por primera vez la aparición de individuo intersexo en juvenil de S. parahybae. También se describió el aspecto normal de los ovarios y de los testículos de individuos juveniles procedentes del mismo lote de cría para su comparación; se realizó además el análisis citogenético. Un espécimen fue clasificado a priori como hembra debido a las características macroscópicas de los ovarios, con pequeños oocitos amarillos, sin flecos (característica principal de los bagres macho) y más grande que los testículos; sin embargo el análisis microscópico reveló la presencia de un ovotestis, incluyendo una espermatogénesis completa. S. parahybae presentó un número diploide, 2n = 56 cromosomas, sin evidencia de cromosomas sexuales diferenciados o supernumerarios entre ellos. Estos hallazgos pueden deberse al resultado de la exposición de los individuos a desorganizadores endocrinos o estar influenciados por las condiciones ambientales. Sin embargo no se puede descartar la posibilidad de la presencia de intersexos de forma espontánea. Por lo tanto, la importancia funcional y las consecuencias reproductivas de estas anomalías permanecen aún sin ser determinadas, sugiriendo que esta especie puede ser susceptible a los disruptores endocrinos. Estos resultados contribuyen a ampliar el conocimiento de la biología reproductiva de esta especie en peligro de extinción en condiciones de cautiverio.

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Intersex in teleost fish: Are we distinguishing endocrine disruption from natural phenomena?

Cited by 128 publications

References 94 publications

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Occurrence of intersex in wild freshwater fish in Slovenian rivers: a histological evaluation

A case of intersex occurrence in Steindachneridion parahybae (Steindachner, 1877) (Siluriformes: Pimelodidae) under captivity condition: a cytogenetic and morphological study

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