Nonylphenol ethoxylate (NPE) influence on reproductive performance of male Nile tilapia, Oreochromis niloticus
Kareem Ahmed; Amer, M.A; Osman, M.F.;
Abstract
The aim of the present study was to investigate the effects of
xenoestrogens, like nonylphenol (NP) on growth performance and gonads
development of male Nile tilapia. Fish were randomly distributed into four
groups in 16 fiberglass tanks with carrying capacity of 15 fish/tank and four
replicates. Fish were exposed to different concentrations of NP. The
contaminations of NP were 0, 25, 50 and 100 μgL-1 administrated for 126
days. After exposure period, fish weight and survival were measured. Gonads
and liver were dissected for calculating both Gonado- Somatic Index (GSI)
and Hepato- Somatic Index (HSI) and processed for histological examination.
At the end of the exposure period in all treated groups, the average survival
rate was significantly lower than that of the control. The average body
weights were ranged between 73.41 ± 1.37g - 78.14 ± 6.86g for the control
and 50 µg NP L-1, respectively with no statistical significant differences.
Results showed slight changes in liver weight among treated group compared
to the control. A significant (P<0.05) reduction in gonads weight and GSI
occurred in exposed fish compared to the control. Testicular sections from the
control group appeared fully mature where, lumens and ducts were loaded
with spermatozoa. However, testicular sections from NP exposed fish showed
germinal epithelium degeneration, which correlated with exposure level of NP
and reflected on low weight of the gonads. The presence of oocytes within the
testicular tissue was pronounced, especially in high dose exposed fish.
Therefore, severity of testis-ova was mild in 25 µg NP L-1, moderate to
pronounced in 50 and 100 µg NP L-1 exposed groups, respectively. From the
obtained results, it could be concluded that the environmental pollutants with
estrogenic activity such as nonylphenol can alter the development of gonads
and disrupt reproduction of wild and farmed fish.
xenoestrogens, like nonylphenol (NP) on growth performance and gonads
development of male Nile tilapia. Fish were randomly distributed into four
groups in 16 fiberglass tanks with carrying capacity of 15 fish/tank and four
replicates. Fish were exposed to different concentrations of NP. The
contaminations of NP were 0, 25, 50 and 100 μgL-1 administrated for 126
days. After exposure period, fish weight and survival were measured. Gonads
and liver were dissected for calculating both Gonado- Somatic Index (GSI)
and Hepato- Somatic Index (HSI) and processed for histological examination.
At the end of the exposure period in all treated groups, the average survival
rate was significantly lower than that of the control. The average body
weights were ranged between 73.41 ± 1.37g - 78.14 ± 6.86g for the control
and 50 µg NP L-1, respectively with no statistical significant differences.
Results showed slight changes in liver weight among treated group compared
to the control. A significant (P<0.05) reduction in gonads weight and GSI
occurred in exposed fish compared to the control. Testicular sections from the
control group appeared fully mature where, lumens and ducts were loaded
with spermatozoa. However, testicular sections from NP exposed fish showed
germinal epithelium degeneration, which correlated with exposure level of NP
and reflected on low weight of the gonads. The presence of oocytes within the
testicular tissue was pronounced, especially in high dose exposed fish.
Therefore, severity of testis-ova was mild in 25 µg NP L-1, moderate to
pronounced in 50 and 100 µg NP L-1 exposed groups, respectively. From the
obtained results, it could be concluded that the environmental pollutants with
estrogenic activity such as nonylphenol can alter the development of gonads
and disrupt reproduction of wild and farmed fish.
Other data
Title | Nonylphenol ethoxylate (NPE) influence on reproductive performance of male Nile tilapia, Oreochromis niloticus | Authors | Kareem Ahmed ; Amer, M.A ; Osman, M.F. | Keywords | Nile tilapia, Oreochromis niloticus, Nonylphenol, Growth performance, liver, GSI, HSI | Issue Date | Jun-2019 | Publisher | Egyptian Journal of Aquatic Biology & Fisheries | Source | M.A., A., K.M., A., M.F., O. (2019). 'Nonylphenol ethoxylate (NPE) influence on reproductive performance of male Nile tilapia, Oreochromis niloticus', Egyptian Journal of Aquatic Biology and Fisheries, 23(3), pp. 1-12. doi: 10.21608/ejabf.2019.34177 | Journal | Egyptian Journal of Aquatic Biology & Fisheries | DOI | 10.21608/EJABF.2019.34177 |
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