In Vivo Changes in the Activity of Gill ATPases, Muscle Cell Volume, and Plasma and Cellular Ionic Concentration of the African Catfish, Clarias gariepinus Induced by Atrazine or DDT at Different Sublethal Concentrations

1995 ◽  
Vol 6 (1) ◽  
pp. 135-150 ◽  
Author(s):  
H. ASSEM ◽  
I. ELSAEIDY ◽  
S. ABO-HEGAB
Keyword(s):  
Cell Volume ◽  
Muscle Cell ◽  
Clarias Gariepinus ◽  
Ionic Concentration ◽  
African Catfish ◽  
Sublethal Concentrations

scholarly journals Haemathological and histological evaluation of African catfish Clarias gariepinus following acute exposure to Methanolic extract of Khaya senegalensis

2015 ◽  
Vol 2 (3) ◽  
pp. 475-482
Author(s):  
Matouke Matouke Moise ◽  
Obadiah Audu Abui
Keyword(s):  
Cell Volume ◽  
Packed Cell Volume ◽  
Methanolic Extract ◽  
Clarias Gariepinus ◽  
Histological Evaluation ◽  
African Catfish ◽  
Median Lethal Concentration ◽  
Intracellular Space ◽  
Exposed Fish ◽  
Khaya Senegalensis

Haematological and histopatholoical effects of methanolic extract of K. senegalensis leaves was investigated on Clarias gariepinus over a period of 96h exposure. The median lethal concentration of the extract was 199.69mg/L. The extract caused decreased in total erythrocytes (TEC) and Packed Cell volume (PCV) respectively and increased of total leukocytes (TLC). Histopathological lesions in the liver, cytoplasmic degeneration, less intracellular space, mild necrosis, sinusoidal blood congestion and marked blood congestion in hepathocytes were recorded. However the severity but not the type of lesions was concentration-dependent. Though, the degree of tissue change (DTC) varied with the methonolic extract used. There was significant association (P<0.05) between the DTC and K. senegalensis methanolic concentration. The cumulative DTC indicated a moderate damage in the liver. The extract was considered toxic to the exposed fish and therefore deleterious on the organs of C. gariepinus.Res. Agric., Livest. Fish.2(3): 475-482, December 2015

The Effect of Sublethal Concentrations of Paraquat on the Tissue Aminotransferases of the African Catfish: Clarias gariepinus

2007 ◽  
Vol 1 (2) ◽  
pp. 98-101 ◽  
Author(s):  
Kori-Siakpere . ◽  
Ovie . ◽  
Adamu . ◽  
Kabir Mohammed and Salubi . ◽  
Oghenevware .
Keyword(s):  
Clarias Gariepinus ◽  
African Catfish ◽  
Sublethal Concentrations

Sex steroids and the initiation of puberty in male African catfish (Clarias gariepinus)

1998 ◽  
Vol 275 (6) ◽  
pp. R1793-R1802 ◽  
Author(s):  
J. Eduardo B. Cavaco ◽  
Cécile Vilrokx ◽  
Vance L. Trudeau ◽  
Rüdiger W. Schulz ◽  
Henk J. T. Goos
Keyword(s):  
Sex Steroids ◽  
Histological Analysis ◽  
Clarias Gariepinus ◽  
African Catfish ◽  
Direct Effects ◽  
Control Groups ◽  
Estradiol 17Β ◽  
Testis Tissue

The effects of sex steroids on spermatogenesis and testicular androgen secretion were studied in juvenile (spermatogonia present in testes) African catfish. Fish were implanted with Silastic pellets containing 11-ketotestosterone (KT), 11β-hydroxyandrostenedione (OHA), androstenetrione (OA), androstenedione (A), testosterone (T), 5α-dihydrotestosterone (DHT), or estradiol-17β (E2). Control groups received steroid-free pellets. Two weeks later, testis tissue fragments were incubated with African catfish luteinizing hormone (LH) and the amount of OHA secreted in vitro (the main androgen produced by African catfish testes) was quantified. Tissue fragments were then fixed for histological analysis of spermatogenesis. Treatment with KT, OHA, and OA stimulated testicular growth and spermatogenesis (spermatocytes and spermatids were found), whereas T, DHT, A, or E2 had no such effects. All steroids, except for DHT and E2, reduced OHA secretion in the absence and presence of LH to ∼10% of the control values. Previous studies have shown that KT, OHA, and OA have little effect on circulating LH levels in juvenile male African catfish, so that these androgens probably had direct effects on the testis. Inasmuch as OHA, OA, and KT have largely similar effects and because OHA and OA are converted to KT in vivo, we suggest that KT is physiologically the most relevant androgen for the initiation of spermatogenesis in African catfish.

In vivo activity of native GnRHs and their analogues on ovulation in the African catfish, Clarias gariepinus (Burchell)

2006 ◽  
Vol 0 (0) ◽  
pp. 061207010624003-??? ◽  
Author(s):  
Tamás Szabó ◽  
Ferenc Radics ◽  
Tomislav Barth ◽  
László Horváth
Keyword(s):  
Clarias Gariepinus ◽  
African Catfish
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