Patterns of oocyte development and related changes in plasma 17-β estradiol, vitellogenin, and plasma chemistry in English sole Parophrys vetulus Girard

Johnson, Lyndal L.; Casillas, Edmundo; Myers, Mark S.; Rhodes, Linda D.; Olson, O. Paul

doi:10.1016/0022-0981(91)90213-g

Cited by 50 publications

(37 citation statements)

References 48 publications

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“…For cod, it may be that confinement stress (e.g., Pickering et al 1987, Jardine et al 1996, Clearwater & Pankhurst 1997 head 1998, Haddy & Pankhurst 1999) has a greater impact on gonadal hormones than capture stress. Also, gonadal hormones in our study co-varied with the GSI in a manner consistent with other reports involving marine demersal fishes (Campbell et al 1976, Wingfield & Grimm 1977, Johnson et al 1991, Harmin et al 1995. Therefore, we suggest that the hormone profiles in this study reflect natural changes.…”

Section: Discussionsupporting

confidence: 79%

Timing of Atlantic cod Gadus morhua seasonal migrations in relation to serum levels of gonadal and thyroidal hormones

Comeau¹,

Campana²,

Chouinard³

et al. 2001

Mar. Ecol. Prog. Ser.

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Serum testosterone, estradiol-17β (E 2 ), L-thyroxine (T 4 ), 3, 5, 3'-triiodo-L-thyronine (T 3 ), and free (protein-unbound) T 3 concentrations were examined in relation to the extensive (up to 650 km) seasonal migrations undertaken by southern Gulf of St. Lawrence cod Gadus morhua L.. Testosterone levels were low as the stock moved out of the Gulf of St. Lawrence in autumn, and increased only during the final stages of the return migration in spring. E 2 in females peaked near the onset of the spring migration, and remained elevated until this migration was completed in early summer. However, we suggest that the changes in E 2 levels are functionally tied with egg development and not with spring migratory behaviour. Free T 3 showed no consistent pattern in relation to seasonal migrations, whereas T 4 and T 3 levels increased at the start of the autumn migration. We conclude that thyroid hormones may facilitate the onset of the autumn migration by enhancing metabolism, sensory physiology and swimming capacity.

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Section: Discussionsupporting

confidence: 79%

Timing of Atlantic cod Gadus morhua seasonal migrations in relation to serum levels of gonadal and thyroidal hormones

Comeau¹,

Campana²,

Chouinard³

et al. 2001

Mar. Ecol. Prog. Ser.

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“…This observation agrees with reports of other investigators who found atresia mainly restricted to yolked oocytes (Khoo 1975, Babu & Nair 1983, Johnson et al 1991.…”

Section: S Ti T2 T3supporting

confidence: 83%

Seasonal reproductive health of flounder Platichthys flesus exposed to sewage effluent

Lye¹,

Frid²,

Gill³

1998

Mar. Ecol. Prog. Ser.

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ABSTRACT. Indicators of environmental oestrogen exposure in male and female wild flounder Platichthys flesus were followed over the annual reproductive cycle. Fish were obtained from the Tyne estuary, UK, which receives effluent from a large sewage treatment works and several other anthrophogenic sources and the Solway Firth, UK, which receives only low levels of sewage effluent. Vitellogenin (vtg), a female-spec~fic protein, was present in the plasma of up to 9 4 % of males from the Tyne and was accompanied by inhibited spermatogenesis and the incidence of pathological testic'ular abnormalities. The vtg levels in males are independent of the seasonal cycle. Female flounders from the Tyne exhibited increased vtg levels and a higher proportion of degenerating oocytes than Solway Firth females. This study provides limited evidence that wild populations of flounders showing oestrogenic responses are also suffering reproductive disturbances but the degree of alteration varies during the seasonal reproductive cycle.

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“…However, the vitellogenic activity of the liver seemed low as indicated by the weakly developed RER, the small mitochondria, and the large amount of glycogen (this study) but also the low levels of E2 and PPP (<0.3 ng ml -1 and 0.1 µg ml -1 , respectively) ( RINCHARD et al, 1997). As reported in goldfish, Carassius auratus L., (DELAHUNTY and DE VLAMING, 1980) the liver weight of roach declined when the largest increase of ovarian 72 J. RINCHARD and P. KESTEMONT et al, 1978), rainbow trout Oncorhynchus mykiss (UPADHAYA et al, 1978; VAN BOHEMEN et al, 1981), English sole Parophrys vetulus (JOHNSON et al, 1991), visible changes were observed in the hepatocytes: strongly developed RER, large mitochondria with many inner folds, decrease of glycogen and lipid droplets. All of these ultrastructural changes suggest Liver Changes and Oocyte Growth the vitellogenic activity of the liver (LEWIS et al, 1976;NG et al, 1984;MOMMSEN and WALSH, 1988).…”

Section: Discussionmentioning

confidence: 46%

Liver Changes Related to Oocyte Growth in Roach, a Single Spawner Fish, and in Bleak and White Bream, Two Multiple Spawner Fish

Rinchard

Kestemont

2003

International Review of Hydrobiology

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The objectives of this study were to compare the seasonal hepatic activity and to evaluate whether this activity was related to the dynamics of oocyte recruitment in three cyprinids from the River Meuse (Belgium): the roach Rutilus rutilus as a single spawner, and the bleak Alburnus alburnus and the white bream Blicca bjoerkna as multiple spawners. In roach, hepatosomatic index (HSI) was low during exogenous vitellogenesis. However, the strong development of the rough endoplasmic reticulum (RER), the presence of large mitonchondria with many inner folds, and the depletion of glycogen, lipid droplets and phospholipids indicated intense hepatic activity during that period. Prior to spawning, hepatic activity decreased as indicated by a decrease of the HSI and in the hepatocytes a regression of the RER and the disappearance of the lipid droplets and glycogen. In bleak, the oocyte recruitment occurred continuously throughout the spawning season and the vitellogenic activity of the liver remained intense throughout that period as suggested by high HSI and the ultrastructure of the hepatocytes. In contrast in white bream the vitellogenic activity of the liver decreased during the spawning season as the completion of the vitellogenesis took place prior to spawnings. We concluded that the vitellogenic activity of the liver is strongly related to oogenesis. IntroductionDifferent reproductive strategies have been identified in teleost fish (WALLACE and SEL-MAN, 1981;WOOTTON, 1984;BALON, 1990;BEVERTON, 1992). In contrast to semelparous species, which spawn once in their reproductive life, iteroparous species may spawn once a year for several years (single spawners), spawn several batches within reproductive years (multiple spawners), have continuous spawning or reproduce at 2-to 3-year intervals (DE VALMING, 1983; WEDDLE and BURR, 1991;MCEVOY and MCEVOY, 1992). The spawning mode of a species is dependent on the dynamic organization of the ovary. However, fish with group-synchronous oocyte development present variations in the number and the synchrony of batches of oocytes present in the ovary, which can lead to a single or multiple spawnings. Moreover, amongst multiple spawners, oocyte recruitment may occur prior to and/or during the entire spawning season.

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Patterns of oocyte development and related changes in plasma 17-β estradiol, vitellogenin, and plasma chemistry in English sole Parophrys vetulus Girard

Cited by 50 publications

References 48 publications

Timing of Atlantic cod Gadus morhua seasonal migrations in relation to serum levels of gonadal and thyroidal hormones

Timing of Atlantic cod Gadus morhua seasonal migrations in relation to serum levels of gonadal and thyroidal hormones

Seasonal reproductive health of flounder Platichthys flesus exposed to sewage effluent

Liver Changes Related to Oocyte Growth in Roach, a Single Spawner Fish, and in Bleak and White Bream, Two Multiple Spawner Fish

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