Gonadal sex differentiation in Atlantic halibut

Hendry, C

doi:10.1006/jfbi.2002.1950

Cited by 6 publications

(6 citation statements)

References 28 publications

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“…3). As already shown in the majority of fish species examined, females initiated gonadal differentiation earlier than males (Chang et al, 1995;Patin˜o et al, 1996;Hendry et al, 2002). In males, the appearance of the first spermatogonia occurred c. 200 dph, and differentiation was completed by 250 dph, as in the females.…”

Section: Discussionsupporting

confidence: 62%

Growth, sex differentiation and gonad and plasma levels of sex steroids in male‐ and female‐dominant populations of Dicentrarchus labrax obtained through repeated size grading

Papadaki

Piferrer

Zanuy

et al. 2005

Journal of Fish Biology

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Starting from 66 days post hatching (dph), European sea bass Dicentrarchus labrax were graded successively to create a fast growing (L-extreme) and a slow growing (S-extreme) population. The L-extreme population grew significantly larger (ANOVA, n ¼ 89-101, P < 0Á01) attaining twice the wet mass of the S-extreme population at 300 dph (130Á9 AE 1Á8 v. 66Á7 AE 0Á9 g, mean S.E.). When the two populations were sexed, the L-extreme consisted of 96Á5% and the Sextreme of 30Á2% females, while the ungraded control had 59Á2% females. Sex differentiation began first in females at a total length (L T ) of 97 AE 4 mm and wet mass of 9Á4 AE 1Á2 g (150 dph), and was completed when fish reached 166 AE 6 mm and 53Á4 AE 6Á4 g (250 dph) in both sexes. Precocious maturation in males was positively correlated to growth. Gonad oestradiol (E 2 ) was significantly higher in the female-dominant population at the onset of ovarian differentiation (ANOVA, n ¼ 10, P < 0Á05) and in the plasma after the appearance of the first primary oocytes (P < 0Á01). Gonad testosterone (T) increased in both populations after sex differentiation (ANOVA, n ¼ 10, P < 0Á05), while plasma levels were significantly higher in the male-dominant population (P < 0Á001). Both gonad and plasma 11-keto testosterone (11-KT) were significantly higher in the male-dominant population (ANOVA, n ¼ 10, P < 0Á01) reaching maximal values at spermiation. The results suggest that E 2 is closely related with ovarian differentiation and the onset of oogenesis, while T and 11-KT is more related to spermatogenesis and precocious maturation. # 2005 The Fisheries Society of the British Isles

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Section: Discussionsupporting

confidence: 62%

Growth, sex differentiation and gonad and plasma levels of sex steroids in male‐ and female‐dominant populations of Dicentrarchus labrax obtained through repeated size grading

Papadaki

Piferrer

Zanuy

et al. 2005

Journal of Fish Biology

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“…They found that female cod appear before males, with ovarian cavities first observed at 102 days post-hatch (dph) when the fish were 27 mm long (total length, TL). This is similar to what is seen in other marine species like Atlantic halibut (Hippoglossus hippoglossus) (Hendry et al, 2002). Male cod were first positively identified (by the appearance of testis containing primary spermatogonia) at 221 dph (TL ¼ 94 mm).…”

Section: Introductionsupporting

confidence: 65%

“…In salmonids like rainbow trout (Oncorhynchus mykiss), a sensitive developmental window affecting sexual differentiation is known to occur early in the larval stage (Billard, 1992). However, in several marine fish the developmental window important for sexual differentiation occurs later, at the juvenile stage after metamorphosis (Blazquez et al, 1998;Hendry et al, 2002;Chiasson et al, 2008).…”

Section: Introductionmentioning

confidence: 96%

Development of Atlantic cod (Gadus morhua) exposed to produced water during early life stages: Effects on embryos, larvae, and juvenile fish

Meier

Morton

Nyhammer

et al. 2010

Marine Environmental Research

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Produced water (PW) contains numerous toxic compounds of natural origin, such as dispersed oil, metals, alkylphenols (APs), and polycyclic aromatic hydrocarbons (PAHs). In addition, PW also contains many different chemicals which have been added during the oil production process. In the study described here, cod were exposed to real PW collected from an oil production platform in the North Sea. This was done in order to best recreate the most realistic field-exposure regime in which fish will be affected by a wide range of chemicals. The biological effects found in this study therefore cannot be assigned to one group of chemicals alone, but are the result of exposure to the complex chemical mixture found in real PW. Since APs are well known to cause endocrine disruption in marine organisms, we focused our chemical analysis on APs in an attempt to better understand the long-term effects of APs from PW on the biology of fish. In this study, cod were exposed to several concentrations of real PW and 17β-oestradiol (E(2)), a natural oestrogen, at different developmental stages. Cod were exposed to PW either during the embryo and early larvae stage (up to 3 months of age) or during the early juvenile stage (from 3 to 6 months of age). Results showed that, in general, APs bioconcentrate in fish tissue in a dose and developmental stage dependent manner during PW exposure. However, juveniles appeared able to effectively metabolise the short chain APs. Importantly, PW exposure had no effect on embryo survival or hatching success. However, 1% PW clearly interfered with the development of normal larval pigmentation. After hatching most of the larvae exposed to 1% PW failed to begin feeding and died of starvation. This inability to feed may be linked to the increased incidence of jaw deformities seen in these larvae. In addition, cod exposed to 1% PW, had significantly higher levels of the biomarkers vitellogenin and CYP1A in plasma and liver, respectively. No similar effects were seen in cod exposed to either 0.1% or 0.01% PW.

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“…Ovarian cavity formation is an early marker of female sex differentiation in some fishes, typically preceding or occurring concurrently with the onset of meiosis (Nakamura et al 1998;Strüssman and Nakamura 2002). Its formation is indeed the earliest marker of ovarian differentiation in flatfish and grouper species (Tanaka 1987;Hendry et al 2002;Luckenbach et al 2003;Murata et al 2009), as well as the Scorpaeniform species, black rockfish (Sebastes schlegeli; Omoto et al 2010). Again, this contrasts with what we observed in sablefish, because ovarian cavity formation occasionally occurred after onset of meiosis and could easily be confused with efferent ducts of testes.…”

Section: Resultscontrasting

confidence: 83%

Gonadal sex differentiation and effects of dietary methyltestosterone treatment in sablefish (Anoplopoma fimbria)

Luckenbach

Fairgrieve

2015

Fish Physiol Biochem

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Methods for sex control are needed to establish monosex aquaculture of sablefish (Anoplopoma fimbria). Here we conducted the first characterization of sex differentiation by histology and hormonal sex reversal experiment in sablefish. Ovarian differentiation was first discernible at ~80 mm fork length (FL) and characterized by development of lamellar structures and onset of meiosis. Testes exhibited a dual-lobe appearance over much of their length and remained non-meiotic until males were ≥520 mm FL (2 years post-fertilization). Juveniles with undifferentiated gonads were provided diets containing 0 (control), 5 or 50 mg 17α-methyltestosterone (MT)/kg for 2 months. Following treatment, controls possessed either ovaries or non-meiotic testes, whereas MT-treated fish exhibited meiotic testes (60% of the fish), intersex gonads (~30%), or gonads that appeared sterile (~10%). A genetic sex marker revealed that all intersex fish were genetic females, although other females appeared to be completely sex reversed (i.e., neomales). One year after treatment, MT-treated fish possessed non-meiotic testes similar to control males or intersex gonads with reduced ovarian features, presumably due to atresia following MT withdrawal. Milt collected from neomales and genetic males 3 years post-treatment permitted sperm motility analyses; however, neomale sperm were virtually immotile. These results demonstrated that sablefish are differentiated gonochorists and that MT treatment from 76 to 196 mm FL induced permanent masculinization of a portion of the genetic females, but acquisition of sperm motility was impaired. Earlier administration of MT may be necessary to sex reverse a higher proportion of genetic females and reduce negative effects on fertility.

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Gonadal sex differentiation in Atlantic halibut

Cited by 6 publications

References 28 publications

Growth, sex differentiation and gonad and plasma levels of sex steroids in male‐ and female‐dominant populations of Dicentrarchus labrax obtained through repeated size grading

Growth, sex differentiation and gonad and plasma levels of sex steroids in male‐ and female‐dominant populations of Dicentrarchus labrax obtained through repeated size grading

Development of Atlantic cod (Gadus morhua) exposed to produced water during early life stages: Effects on embryos, larvae, and juvenile fish

Gonadal sex differentiation and effects of dietary methyltestosterone treatment in sablefish (Anoplopoma fimbria)

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