الفهرس 
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Abstract
The Suez Bay was considered a nursery ground for most of the important commercial fishes and the only source for Mugil species that represent the main catch, especially Mugil seheli. At present, evidence of decline in the landings of Mugil Seheli in the Suez Bay among commercial is noticed.
In addition, more effects are wastewater released in the aquatic environment, resulting in significat disturbances of breeding, feeding and migration pattern of communities.
•FP (N. unit) wastewater parameters were: temperature (30.6-20.9° C), pH (11.7-8.1), DO (3.0 — 1.2 ml 02/4 alkalinity (593.5 - 150.0 mg Ca2CO3/L), COD (210-72 mg/L), ammonia (271.9-100.9 mg/L) and phosphate (1.38-0.26
mg/L).
•FP (S. unit) parameters were: temperature (30.5-21.0° C), pH (8.9-7.2), DO (3.1-2.0 mg O2/L), Alkalinity (320-110 mg Ca CO3/L),’ COD (187-65.2 mg/L), Ammonia (497-151.4 mg/L) and Phosphate (1.2-0.13 mg/L).
•Misr-Iran Textile wastewater parameters were: temperature (29.0-18.3° C), pH (11.9-8.5), DO (3.5-0.32 ml 02/L), alkalinity (721.4-341.2 mg CaCO3/L), COD (437.1-105.6 mg/L), ammonia (3.99-1.17 mg/L) and (3.2-
0.5 mg/L),
•North drain wastewater parameters were: temperature (32.0-27.9° C), pH (10.7-8.7), DO (2.5-2.3 ml 02 /L), alkalinity (445-220 mg CaCO3 /L), COD (166.7-145.5
mg/L), ammonia (781.0-77.5 mg/L) and phosphate (1.86-0.50 mg/L).
•South drain wastewater parameters were: temperature (32.5-22.0° C), pH (8.8-7.7), DO (2.6-2.0 ml O2/L), alkalinity (376-220 mg CaCO3/L), COD (161.8-148.8
mg/L), ammonia (271.7-100.9 mg/L) and phosphate (1.26— 0.31 mg/L).
The toxicity tests were applied for each effluent and its
major chemical compOnents on Mugil seheli fingerlings for 96-h under lab conditions.
•Highest mortality were observed at the concentration 56.0 ml/L for FP (N unit) wastewater, where no survivals were detected after 48-h had been observed and the least effect was observed at the concentration 3.5 ml/L where
only 8 fishes died after 96-h. The observed 96-h LC50 was 7.4 and the calculated one was 9.3 ml/L.
•The toxicity results for FP (S unit) wastewater showed that the mortality percentage tends to increase gradually at all concentrations 25 fishes died in the first 24-h at the highest concentration 56.0 ml/L, while only 5 fishes died at the concentration 3.5 ml/L. By the end of the experiment,
it was found that, 43% of the fishes died at the concentration 7.0 ml/L compared with 27% at
concentration 3.5 ml/L. The observed 96-h LC50 for the effluent was 7.6 ml/L and the calculated one was 9.0. • The toxicity of textile mill effluent was determined at different concentrations on Mugil seheli fingerlings for 96 h. The results indicated that at highest mortality, 93% of fishes at concentration 250 ml/L dead before the end of the experiment. It was observed that the percentage mortality at concentrations 200, 150, and 100mI/L did not increase in the last 24-h. While, the observed 96-h LC50 was 118.0 ml/L and the calculated one was 122 ml /L.
•The results for slaughterhouse wastewater showed that a limited effect on the survival of fishes within the first 24h at concentrations 400 and 500 ml/L was there. The mortality percentage increased gradually with increase of the concentrations and the observed and calculated 96-h
LC50 was 664 ml/L.
•Ammonia was detected in high concentration in the effluents of the plant fertilizer of north and south unit and also was detected in the north and south drains. So, ammonium chloride was chosen as one of the nitrogenous components to be tested on the fingerlings of Mugil seheli. The results showed that 27% of the fishes dead after 96 h at 0.05 g/L and 100% at 0.3 g/L of ammonium chloride. The observed 96-h LC50 was 0.13g/L and the calculated
was one 0.14 g /L.
•Sodium hydroxide is usually used in Textile operation. The toxicity results show that the concentration 0.4g/L has the highest effect, as 93% of the fishes died in the first 24-h. The concentration 0.05 g/L showed the least mortality rate as only 27% of the fishes died after 96-h. The observed 96-h LC50 was 0.13 g/L and the calculated onewas 0.14 g /L.
•The north drain receives the effluents of Misr-Iran of Textile, the FP (N. Unit) and Slaughterhouse effluents and the domestic sewage .from the surrounding area. So, the bioassay results show high mortality percentage, 100% at concentration 56.0 ml/L after 96-h of exposure. While concentration 7.0mI/L showed 27% mortality within the first 24-h of exposure and 87% after 96-h of exposure. The observed 96-h LC50 was 9.13 ml/L and the calculated
one was 10.5 nil /L.
•South drain effluents include the wastewater of FP (S. Unit), the sewage of Ataqa Power Station and the domestic sewage of EI-Semad population area. The toxicity results show that only 20% of the fishes were dead after 96-h at concentration 3.5 ml/L. The observed 96-h LC50 was 10.69 ml/L and the calculated one was 12.70.