Croissance ovocytaire et régulation stéroïdienne chez les poissons à pontes unique et multiples : une revue

Rinchard, Jacques; Poncin, Pascal; Kestemont, Patrick

doi:10.1051/limn/1998020

Cited by 8 publications

(5 citation statements)

References 80 publications

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“…The sex-related differences in liver mass and hepatosomatic index can be explained by the maturation stage of chubs. Considering vitellogenesis, the liver of females is stimulated to produce vitellogenin that increases the liver mass by the proliferation of endoplasmatic reticulum and Golgi apparatus in hepatocytes (Rinchard et al 1998;Mayon et al 2006). In native fish population gender dependent MT concentrations are hard to distinguish (Linde et al 1999), but still our data in Table 4 indicate that average concentrations of MT are significantly higher in females caught during the reproductive period compared to females from the nonreproductive period; 24% increase in average MT concentration could be interpreted as indicating the beginning of sexual maturation of female specimens (Olsson et al 1987;Thompson et al 2003) that are prevailing in our study (∼60%).…”

Section: Gender Differencesmentioning

confidence: 99%

Seasonal variation of the metal (Zn, Fe, Mn) and metallothionein concentrations in the liver cytosol of the European chub (Squalius cephalus L.)

Podrug

Raspor

2008

Environ Monit Assess

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Seasonal variations of biometric parameters as well as metal and protein concentrations were analyzed in the liver cytosol of indigenous European chub (Squalius cephalus L.). Fish sampling was carried out in the reproductive (spring) and non-reproductive period (autumn) in order to define parameters which are seasonally dependent. The specimens caught in the spring period had higher biometric (liver mass, condition and hepatosomatic indices) and some biochemical parameters (metallothionein (MT) and Mn) that are characteristic for the reproductive period. Contrary, Fe hepatic cytosolic concentrations were significantly lower in specimens from spring than in autumn period. Total cytosolic proteins, Cu and Cd concentrations were not seasonally dependent. Range of constitutive levels was determined for total cytosolic proteins (17.7 to 24.7 mg ml(-1)) from the whole set of data. Constitutive range of seasonally dependent parameters MT (207 to 337 microg ml(-1)) and Mn (0.11 to 0.19 microg ml(-1)) is based on the data from non-reproductive period. In order to avoid the interference of reproductive cycle on the level of selected biochemical parameters, it is recommended to perform chub sampling during non-reproductive period.

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Section: Gender Differencesmentioning

confidence: 99%

Seasonal variation of the metal (Zn, Fe, Mn) and metallothionein concentrations in the liver cytosol of the European chub (Squalius cephalus L.)

Podrug

Raspor

2008

Environ Monit Assess

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“…It has been shown that the increase of liver weight is caused by the proliferation of endoplasmic reticulum and Golgi apparatus in hepatocytes (Rinchard et al, 1998). As sampling took place during the early spawning season of chub, female fish were still in vitellogenesis and therefore displayed higher LSI than males.…”

Section: Reproductive Parametersmentioning

confidence: 99%

Multiscale approach of fish responses to different types of environmental contaminations: A case study

Mayon

Bertrand

Leroy

et al. 2006

Science of The Total Environment

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In order to study the responses of wild fish to environmental contaminations, different sites (two references and three contaminated) were sampled across the Walloon hydrographical network (southern Belgium). The status of fish communities was characterized according to an index of biotic integrity (IBI). Furthermore, population structure, reproductive parameters and biochemical assays were performed on chub (Leuciscus cephalus) as sentinel species. The results showed impaired responses in fish sampled downstream paper mill effluents (BKME), in a polychlorinated biphenyls (PCB) contaminated site, and in a river receiving pesticides (i.e. atrazine and hexachlorocyclohexane). High level of hepatic 7-ethoxyresorufin-Odeethylase (EROD) activity were evidence of direct toxicant exposure, while population structures showed unbalanced size-frequency distributions. Moreover, in the pesticide contaminated site, a higher proportion of atretic oocytes was found in females and abnormally high plasma alkali-labile phosphorus (ALP) values were noticed in males, compared to reference sites, suggesting that chubs were exposed to estrogenic compounds. IBI scores from both sites were also lower than in reference sites. On the other hand, no particular response was found in hepatic glutathione-S-transferase (GST) activities, hepatic heat-shock protein HSP70 concentrations and plasma sex steroids (estradiol-17β, 11-ketotestosterone and testosterone) in chubs from any sites. By using a multiparametric approach, a better understanding of response mechanisms to pollution in fish may be achieved in order to improve the ecological status of river ecosystems.

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“…This fecundity is higher than that determined on the coasts of the Central-Western Indian Ocean (between 140,000 and 550,000 oocytes) [35] . However, it is lower than those obtained in Mexico (between 45,022 and 1930,245 oocytes) [7] , in the Mediterranean (between 385,000 and 1134,500 oocytes) [33] , in the Central-Western Atlantic Ocean (between 58,000 and 1,500,000 oocytes) [36] The variation in the fecundity value would be due to the environmental factors of the environment which would influence oocyte development. According to Le Bec [20] , the difference between the values is linked to variations in abiotic factors such as temperature and salinity or to biotic factors which condition fertility.…”

Section: Discussionmentioning

confidence: 75%

Reproductive biology of Coryphaena hippurus (Linnaeus, 1758) caught by artisanal fishermen in the Gulf of Guinea

2022

JCBSC

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The study of the reproductive biology of Coryphaena hyppurus caught by artisanal fishermen in the Gulf of Guinea was carried out on specimens from the artisanal maritime fishery from January 2017 to December 2018. This study aims to provide more complete information on the various reproductive parameters. It led to the determination of the size at first sexual maturity, used as an indicator of reproductive maturity; RGS, oocyte atresia rate and post-ovulatory follicles to guide lay; microscopic maturity stages and oocyte diameters to characterize the mode of reproduction; fertility to determine the reproductive potential of the species. The size at maturity revealed reproduction of the species around 59 cm. The stages of maturity revealed the presence of fish of all stages, a sign of serial reproduction of the species. Measurements of oocyte diameters showed oocytes of varying stages of maturity reflecting asynchronous oocyte development. The fecundity of females varies between 33,527 and 860,880 oocytes with a relative fecundity between 14 and 259 oocytes per gram of body weight. The rate of atresia is 14.06 ± 9.18%. The combined analysis of the RGS, the rate of females at the egg-laying stage and the rate of atresia made it possible to distinguish two main periods of reproduction: from February to May and from September to December. The observed post-ovulatory follicles show that spawning takes place in the environment.Reproductive… KOUAME Konan Jacques et al.

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Croissance ovocytaire et régulation stéroïdienne chez les poissons à pontes unique et multiples : une revue

Cited by 8 publications

References 80 publications

Seasonal variation of the metal (Zn, Fe, Mn) and metallothionein concentrations in the liver cytosol of the European chub (Squalius cephalus L.)

Seasonal variation of the metal (Zn, Fe, Mn) and metallothionein concentrations in the liver cytosol of the European chub (Squalius cephalus L.)

Multiscale approach of fish responses to different types of environmental contaminations: A case study

Reproductive biology of Coryphaena hippurus (Linnaeus, 1758) caught by artisanal fishermen in the Gulf of Guinea

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