Abstract
The nile tilapia (Oreochromis niloticus), a very popular fish commercially in the Philippines, was studied to determine its radiosensitivity and to see its potential as a biological indicator in aquatic ecosystems. Nile tilapia was seen to be radiosensitive. The fish were exposed to gamma-irradiation and chromosomal aberrations were induced. The various types of aberrations seen were chromatid gaps, chromosome gaps, chromatid fragments, dicentric rings, fusions, despiralizations and translocations. Among the aberrations observed, dicentric rings, fusions and chromosome gaps were strongly correlated with dosage, with only the dicentric rings increasing steadily with increasing dosage. In the course of the study, the lethal dosage{sub 50} for nile tilapia with 18 days was determined and it was observed at 2.0 krad. The modal chromosome number was also established at 2n=44 with a karyotype exhibiting 22 pairs of acrocentric chromosomes with 2 pairs of marker chromosomes present. (Author)
Citation Formats
Reyes, Michael Joseph T, and Velasco, Pia Victoria V.
The radiosensitivity of nile tilapia (Oreochromis niloticus) fingerlings.
Philippines: N. p.,
2000.
Web.
Reyes, Michael Joseph T, & Velasco, Pia Victoria V.
The radiosensitivity of nile tilapia (Oreochromis niloticus) fingerlings.
Philippines.
Reyes, Michael Joseph T, and Velasco, Pia Victoria V.
2000.
"The radiosensitivity of nile tilapia (Oreochromis niloticus) fingerlings."
Philippines.
@misc{etde_20073994,
title = {The radiosensitivity of nile tilapia (Oreochromis niloticus) fingerlings}
author = {Reyes, Michael Joseph T, and Velasco, Pia Victoria V}
abstractNote = {The nile tilapia (Oreochromis niloticus), a very popular fish commercially in the Philippines, was studied to determine its radiosensitivity and to see its potential as a biological indicator in aquatic ecosystems. Nile tilapia was seen to be radiosensitive. The fish were exposed to gamma-irradiation and chromosomal aberrations were induced. The various types of aberrations seen were chromatid gaps, chromosome gaps, chromatid fragments, dicentric rings, fusions, despiralizations and translocations. Among the aberrations observed, dicentric rings, fusions and chromosome gaps were strongly correlated with dosage, with only the dicentric rings increasing steadily with increasing dosage. In the course of the study, the lethal dosage{sub 50} for nile tilapia with 18 days was determined and it was observed at 2.0 krad. The modal chromosome number was also established at 2n=44 with a karyotype exhibiting 22 pairs of acrocentric chromosomes with 2 pairs of marker chromosomes present. (Author)}
place = {Philippines}
year = {2000}
month = {Apr}
}
title = {The radiosensitivity of nile tilapia (Oreochromis niloticus) fingerlings}
author = {Reyes, Michael Joseph T, and Velasco, Pia Victoria V}
abstractNote = {The nile tilapia (Oreochromis niloticus), a very popular fish commercially in the Philippines, was studied to determine its radiosensitivity and to see its potential as a biological indicator in aquatic ecosystems. Nile tilapia was seen to be radiosensitive. The fish were exposed to gamma-irradiation and chromosomal aberrations were induced. The various types of aberrations seen were chromatid gaps, chromosome gaps, chromatid fragments, dicentric rings, fusions, despiralizations and translocations. Among the aberrations observed, dicentric rings, fusions and chromosome gaps were strongly correlated with dosage, with only the dicentric rings increasing steadily with increasing dosage. In the course of the study, the lethal dosage{sub 50} for nile tilapia with 18 days was determined and it was observed at 2.0 krad. The modal chromosome number was also established at 2n=44 with a karyotype exhibiting 22 pairs of acrocentric chromosomes with 2 pairs of marker chromosomes present. (Author)}
place = {Philippines}
year = {2000}
month = {Apr}
}