SEX STEROIDS AND SPERMATOGENESIS IN THE AFRICAN CATFISH (<i>CLARIAS GARIEPINUS</i>)

Cavaco, José E.

doi:10.1080/01485010490500625

Cited by 7 publications

(3 citation statements)

References 46 publications

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“…Similar results on the advancement of the spermatogenic processes were observed by Margiotta-Casaluci and Sumpter (2011) in the fathead minnows exposed to waterborne 5α-DHT. However similar effects were not demonstrated in the African catfish (Cavaco, 2005;Cavaco et al, 1998Cavaco et al, , 2001, suggesting either a species specific differential sensitivity or differences depending on the gonadal stages. Although it is known that androgens are required for spermatogenesis (Cavaco et al, 1997;Schulz and Nobrega, 2011), the role of 5α-DHT on this process is still under discussion .…”

Section: Figcontrasting

confidence: 48%

Effects of 5α-dihydrotestosterone on expression of genes related to steroidogenesis and spermatogenesis during the sex determination and differentiation periods of the pejerrey, Odontesthes bonariensis

González¹,

Fernandino²,

Somoza³

2015

Comparative Biochemistry and Physiology Part A: Molecular &

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Section: Figcontrasting

confidence: 48%

Effects of 5α-dihydrotestosterone on expression of genes related to steroidogenesis and spermatogenesis during the sex determination and differentiation periods of the pejerrey, Odontesthes bonariensis

González¹,

Fernandino²,

Somoza³

2015

Comparative Biochemistry and Physiology Part A: Molecular &

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“…Ankley et al (2001) reported that the reproductive output of species is an integral endpoint in fish toxicology studies and an important aspect of risk assessment for aquatic ecosystems. The dynamics of synthesis and interrelationships of androgens and the control of their bioavailability are very essential to the regulation of pubertal development in male African catfish (Cavaco, 2005) (Kumar et al, 2005;Wirth et al, 2007). In freshwater fishes, Ofor & Udeh (2012) reported that sperm mortality caused low fertilization.…”

Section: Discussionmentioning

confidence: 99%

Acute Exposure to Textile Waste Water Altered the Reproduction Biomarkers in Clarias gariepinus Broodstock

Durojaiye,

Bamidele,

Dabo

et al. 2023

JFS

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This study was prompted by an earlier study that revealed the absence of gonads in all fish species caught around the Itoku tributary of the Ogun River, an area known for active textile activities. Thus, this study investigated the effect of textile wastewater on reproduction biomarkers in African catfish broodstock. Male and female broodstock were exposed to varying pre-determined concentrations (0ppb-T0, 0.5ppb-T1, 0.35ppb-T2, 2ppb-T3) of the textile wastewater for a period of 96 hours. Water quality parameters, seminal/ovarian hormones, metabolites, ions, oxidative, enzymes, and sperm viability were assayed. The water quality parameters of the wastewater indicated varying degrees of physical and chemical pollution. The values of hormones were significantly different (p<0.05) although a trend was not observed. Prolactin, however, showed a marked difference statistically across the treatments in the male broodstock while a reverse trend was observed in the female broodstock. The values recorded for seminal metabolites increased significantly compared to the control except for T3 for cholesterol and T1 glucose which were significantly lower than the control. In the female broodstock, the values for glucose and creatinine significantly increased compared to the control. Seminal ions evaluated showed significant differences across treatments. Except for T1, there was a significant reduction observed in the values of sodium, chloride, and calcium compared to the control. For ovarian ions, a significant increase was recorded across the treatments compared to the control. However, sodium recorded a significant decrease compared to the control except for T3 where the value was higher than the control. In the male broodstock, aspartate aminotransferase and alanine aminotransferase values were significantly lower compared to control while an opposite trend was observed in the female broodstock. The concentration of sperm and life- to-death ratio significantly reduced across treatments compared to the control. These results indicate that the textile wastewater altered the reproduction biomarkers in the male and female broodstock. The implication of this is that reproduction in fish might become a challenge in textile wastewater polluted Itoku tributary of the Ogun River.

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“…These reports, when taken together with the present findings, indicate that seasonal changes in the environmental water temperature and natural day-length are primary cues for altering testicular activity and play major roles in the regulation of breeding/reproduction of the fish. It is a well-established fact that testosterone and 11-ketotestosterone are important for regulating spermatogenesis in fish (Borg, 1994;Cavaco, 2005;Cavaco et al, 1998;Dubious et al, 2001;Goos et al, 1986;Miura et al, 1991). It has been shown that the plasma levels of testosterone and 11-ketotestosterone are low during the resting/non-reproductive period and high during the nesting/maturation period (Gazola and Borella, 1997;Sisneros et al, 2004).…”

Section: Discussionmentioning

confidence: 99%

Variations in the Plasma Levels of Thyroid Hormones and Testicular Activity in the Male Air-breathing Catfish (Clarias gariepinus) over the Annual Cycle

Suchiang¹,

Gupta²

2011

IJB

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The purpose of this study is to evaluate seasonal variations in thyroxine (T 4 ) and triiodothyronine (T 3 ) levels and testicular activity in the male air-breathing catfish Clarias gariepinus. Plasma T 4 levels increased from March to a peak in July and then decreased throughout autumn, declining to their lowest level in January. Plasma T 3 levels also varied seasonally, increasing from March to a peak in June. The increase in plasma levels of thyroid hormones coincided with an increase in the testicular activity of the fish. The gonadosomatic index (GSI) peaked in May and then declined slowly. In February and March, the testes were characterized by a new generation of spermatogenic cells. Mature spermatozoa appeared in April and became dominant in the testes during the summer months. Testicular activity decreased gradually with the gradual decrease in water temperature and day-length during the autumn season. Decreased testicular activity during the winter months was associated with low GSI values. The patterns of seasonal change in the levels of thyroid hormones as well as testicular activity were similar to those in water temperature and natural day-length.

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SEX STEROIDS AND SPERMATOGENESIS IN THE AFRICAN CATFISH (CLARIAS GARIEPINUS)

Cited by 7 publications

References 46 publications

Effects of 5α-dihydrotestosterone on expression of genes related to steroidogenesis and spermatogenesis during the sex determination and differentiation periods of the pejerrey, Odontesthes bonariensis

Effects of 5α-dihydrotestosterone on expression of genes related to steroidogenesis and spermatogenesis during the sex determination and differentiation periods of the pejerrey, Odontesthes bonariensis

Acute Exposure to Textile Waste Water Altered the Reproduction Biomarkers in Clarias gariepinus Broodstock

Variations in the Plasma Levels of Thyroid Hormones and Testicular Activity in the Male Air-breathing Catfish (Clarias gariepinus) over the Annual Cycle

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