Gonadosomatic and hepatosomatic indices of the freshwater fish Notopterus notopterus (Pallas) in response to some heavy metal exposure.
Area wise, the measurement of LC50 for pollutants is of great value in predicting the safe concentration dose of the contaminant in the environment on different aquatic species. The lethality of toxic substances including heavy metals to the aquatic organisms are usually assessed by following static bio-assay or continuous flow methods. The toxicity tests for mercuric chloride (HgCl2), cadmium chloride (CdCl2) and their mixture on Notopterus notopterus was determined by using 96h LC50 concentration on fish N. notopterus which indicated that cadmium chloride (CdCl2) was less toxic and mercuric chloride (HgCl2) was most highly toxic. The order of toxicity is mercuric chloride > mixture > cadmium chloride. On the basis of gonadosomatic index the reproductive cycle of N. notopterus can be categorised into immature, developing, maturing, mature, ripe and spent stages. Liver forms important organ of the body, which has a role in the ovarian development. On exposure to heavy metals at sublethal concentration both GSI (gonadosomatic index) and HSI (hepatosomatic index) are reduced.
Sindhe
V R
VR
Department of Zoology, Gulbarga University, Gulbarga-585 106, India.
Kulkarni
R S
RS
D000818:Animals; D019256:Cadmium Chloride / Q000633:toxicity; D005260:Female; D005399:Fishes; D005618:Fresh Water; D006062:Gonadotropins / Q000378:metabolism*; D006066:Gonads / Q000187:drug effects* / Q000378:metabolism; D007928:Lethal Dose 50; D008099:Liver / Q000187:drug effects* / Q000378:metabolism; D008627:Mercuric Chloride / Q000633:toxicity; D019216:Metals, Heavy / Q000633:toxicity*; D009929:Organ Size / Q000187:drug effects / Q000502:physiology; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D006062:Gonadotropins; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D008627:Mercuric Chloride; D019256:Cadmium Chloride