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Biochemical Changes in Hybrid Catfish (Heterobranchus bidorsalis,♂ x Clarias gariepinus,♀) Treated with Nuracron

应用与环境生物学报 2010年第3期16卷 353-357页

作者： GABRIEL Ugwemorubong Ujagwung OBOMANU Faithwin Gamalie edori onisogen simon Department of Fisheries and Aquatic Environment Rivers State University of Science & Technology P.M.B 5080 Port Harcourt 5000001 Nigeria Department of Chemistry Rivers State University of Science & Technology P.M.B 5080 Port Harcourt 5000001 Nigeria Department of Chemistry Rivers State University of Education P.M.B. 5047 Rumuolameni Port Harcourt. 5000001 Nigeria

The effects of sublethal levels of nuracron,dimethylphosphate-3-hydroxy-N-methyl-cis-crotonamide(0,0.625× 10-6,1.25×10-6,2.5×10-6,5.0×10-6 and 10.0×10-6) on biochemical changes(aspartate transaminase,AST,E.C.2.***.1.1;alanine transaminase,ALT;2.***.2.2;alkaline phosphatase,ALP,EC 3.***.3.1) in the organs(kidney,liver,gill) and muscle tissues of hybrid catfi sh Heterobranchus bidorsalis,♂× Clarias gariepinus,♀ [mean weight,(277.76±53.11) g SD;mean total length,(35.69±2.80) cm,SD] were studied after a 23 d exposure in a renewal bioassay under laboratory ***,nuracron inhibited AST,ALT and ALP activities in all the exposure concentrations,with ALT activity being mostly *** most elicited enzyme was ALP in the kidney [(4 052.67±1610.45) IU/L],followed by AST in the muscle [(908.44±218.34) IU/L] and ALT in the liver [(160.29±73.68) IU/L].The ALP activity was 30.24 and 6.53 times greater than that of ALT and *** highest inhibition for AST(43.65%),ALT(47.88%) and ALP(57.98%) occurred at 10×10-6,0.625×10-6 and 2.5×10-6,*** activities of the enzymes in all the organs did not show any direct relationship with the exposure concentrations of the *** activity in the muscle generally suffered the most compared with the other *** activities of enzymes in the liver were generally inhibited,with elevation at 5.0×10-6 for all the *** lower concentrations of nuracron(0.625 ×10-6～2.5×10-6) caused elevation in the activities of ALP,but the reverse was the case with the higher concentrations;these of AST and ALT were *** relative activities of the various enzymes in the organs showed that the order for AST was liver>muscle>kidney>gill;that for ALT:liver>kidney,muscle>gill and that for ALP:kidney>gill>liver and ***,for AST and ALT the activities in the organs of the exposed fi sh peaked at 5.0×10-6 *** alteration in the activities of the enzymes indicated that the extract interfered with the Kreb's c

关键词： aspartate transaminase alanine transaminase alkaline phosphatase hybrid catfi sh nuracron

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Acute Toxicity and Behavioural Responses of African Catfish,Clarias gariepinus to Amine Salt of 2,4-D

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应用与环境生物学报 2010年第3期16卷 347-352页

作者： GABRIEL Ugwemgorubong Ujagwung MACAULAY Bonny Koffi edori onisogen Simeon Department of Fisheries and Aquatic Environment Rivers State University of Science and Technology Bayelsa State Agricultural Development Programme Ministry of Agriculture Department of Chemistry Rivers State University of Education

Fingerlings of African catfish,Clarias gariepinus [mean total length,(7.0±1.0) cm SD;mean weight,(3.0±0.7) g SD] were exposed to acute concentrations of amine salt of 2,4-D(0,50,200,250,350,and 400 mg/L) to determine the behavioural responses and *** raised in aquaria the fish became *** beat frequencies(opercular and tail beat frequency per minute,OBF and TBF) of the exposed fish declined with increase in the exposure duration and concentration,but the reverse was the case with percent *** variables signifi cantly differed at both the exposure duration and concentration of the toxicant(P<0.05).Anova of the linear regression between variables-OBF,TBF and mortality on exposure duration indicated a strong positive relationship(P<0.001) with the entire variables except mortality and exposure *** and TBF were inversely correlated with exposure duration(r=-0.99;P<0.05).The 96 h lethal concentration was 165.36(133.29～190.51,C.L.) mg/L and the median lethal time at the highest concentration was 20.41(11.87～27.46) *** results from this study revealed that 2,4-D was very toxic to *** under laboratory conditions and its application should therefore,be restricted in the field.

关键词： acute toxicity 2,4-D Clarias gariepinus opercular behavioural change

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