Resistance to a heavy metal mixture in Oreochromis niloticus progenies from parents chronically exposed to the same metals
MetadataShow full item record
Cited times in Scopus
Adult Oreochromis niloticus were mass spawned in concrete tanks. The one-month old progenies (F1) were exposed for two months to a mixture of 0.01 mg L−1 Hg, 0.1 mg L−1 Cd and 1.0 mg L−1 Zn. The survivors were grown to sexual maturity in a natural environment (lake). The fish were spawned and the progenies (F2) of the exposed F1 (EF1) were exposed to another mixture of the three metals: 3.0 mg L−1 Zn, 0.30 mg L−1 Cd and 0.01 mg L−1 Hg, both in a static and static-renewal system. Another group of F2 from unexposed F1 (UF1) received the same treatment. Results showed that in both exposure systems, survival of the F2 of EF1 was significantly higher (P<0.05) than those from UF1. The medial lethal time (LT50) of the F2's were estimated from the time-response curve following regression analysis: 5.16 days (F2 of UF1) and 9.03 days (F2 of EF1) in the static exposure experiment; 3.34 days (F2 of UF1) and 5.52 days (F2 of EF1) in the static-renewal run. Exposure of the parental stock resulted in the culling out of individuals which were more susceptible to the heavy metals. The more resistant members of the population (survivors) which have the ability to adapt to the toxicants were able to pass on the resistance to their offspring. The results are supported by other studies in the field which demonstrate high resistance in populations of organisms living in contaminated sites.
Poster presented at the Fifth International Symposium on Genetics in Aquaculture, June 19–25, 1994, Halifax, Nova Scotia, Canada.
Suggested CitationCuvin-Aralar, M. L. A., & Aralar, E. V. (1995). Resistance to a heavy metal mixture in Oreochromis niloticus progenies from parents chronically exposed to the same metals.
- Journal Articles 
Showing items related by title, author, keyword and subject.
Accumulation and excretion of metal granules in the prawn, Penaeus monodon, exposed to water-borne copper, lead, iron and calcium Vogt, Günter; Quinitio, Emilia T. (Elsevier, 1994)Juveniles of the giant tiger prawn, Penaeus monodon, were exposed for 10 days to 1 mg/l copper, lead, iron or calcium in order to investigate the formation and accumulation of metal granules in major soft tissues as well ...
Antibacterial chemotherapy in aquaculture: review of practice, associated risks and need for action Inglis, V. (Aquaculture Department, Southeast Asian Fisheries Development Center, 2000)This paper briefly reviews the use of chemicals to prevent and treat bacterial diseases in aquaculture, and provides a detailed summary of the current state of knowledge on the development of bacterial resistance to ...
Sako, Hiroshi. (Aquaculture Department, Southeast Asian Fisheries Development Center, 1995)Losses of cultured marine and freshwater fishes due to diseases averaged about 20,000 tons each year or 6% of the aquaculture production in Japan in 1980-1991. During this last decade, bacterial diseases have been responsible ...