title: A preliminary report on effect of pulsed magnetic fields on fresh water fish (Labeo rohita) chromosomes.
abstract: Marine-life scientists around the world are already carrying out investigative trials to obtain higher yields under in-captive breeding conditions, on both edible varieties and ornamental fishes with optimal inputs. However, for such trials to succeed there is a need for genetic improvement. The idea that fish production can be enhanced by genetic manipulation is gaining acceptance, as there is a strong possibility that qualitative improvement of economically important traits can be achieved by identifying and utilizing more effective genotypes. In the present communication a tentative plan for genetic manipulation of fresh water fish using controlled, pulsed magnetic fields, is being discussed. Chromosome preparations of Labeo rohita were made using Colchicine-Methanol-Acetic acid air drying technique, using tissue from gills. The fish were exposed to Pulsed Magnetic Field (PMF)with intensity 0.2 Gauss, pulsing at 50 Hz frequency (sine wave) for 6 hours / day for a total period of 30 days inside specially designed magnetic field enclosures. The karyological investigations revealed no distinct difference between "test" and "control" groups.
authors.affiliation: Madras Institute of Magnetobiology, Anna Nagar, Chennai-600 040, India. p_mim@hotmail.com
authors.forename: M
authors.initials: M
authors.lastname: Vijayalakshmi
authors.forename: K Thresia
authors.initials: KT
authors.lastname: Mathews
authors.forename: M
authors.initials: M
authors.lastname: Selvanayagam
authors.forename: P V
authors.initials: PV
authors.lastname: Sankernarayan
mesh_terms: D000818:Animals; D002875:Chromosomes / Q000528:radiation effects* / Q000648:ultrastructure; D004574:Electromagnetic Fields; D005399:Fishes / Q000235:genetics*; D005618:Fresh Water; D005880:Gills / Q000473:pathology; D007621:Karyotyping / Q000379:methods*