الفهرس 
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Abstract
Suez Canal is considered as the vital link between Red and Mediterranean seas with different environment. The canal was divided into three sectors (Port Said, Ismailia and Suez) including 12 sits. The study was concerned to physicochemical parameters, heavy metals, toxicity of lead and copper with physiological effects in addition to biological characters of a selected fish species.
Water temperature in the study area recordedits highest and lowest values in summer and winter. Highest seasonal salinity was recorded in winter. Autumnattained the highest dissolved oxygen and biochemical oxygen demand. Nutrient salts (ammonia, nitriteand nitrate) recordedits highest seasonal values during summer, while phosphate highest level was recorded in spring.
Heavy metals (lead, cadmium, copper, zinc and iron) were investigated in water, sediments and fish organs (muscles, liver and gills). Cadmium recorded the lowest values of all studied metals in water, sediments and fish organs, while iron was the highest one.
96-h LC50 values of lead and copper in fish Liza carinatawere2.818 and 0.447 mg/l, respectively. At exposure of fish to 20% 96-h LC50 of Pb and Cu, transaminases and alkaline phosphatase were increased in their activity at first 24 h then decline under control level with increasing the time of exposure. Protein level fluctuated around the control level in muscles and liver in addition to the total lipid in muscles.
Fish Liza carinata had mean total length and weight of 14.80±2.20 cm and 37.53±16.38 gm, respectively and with sex ratio (male: female) of 1.00:1.64. The highest gonado-somatic index of female was recorded in autumn and winter for males. The higher frequencies percent of females and male were observed at length intervals of 15.0-15.9 and 14.0-14.9 cm, respectively. The length weight relationship was followed the equation W=aLb.
Key words: Suez Canal, physic-chemical parameters, heavy metals, water, sediments, fish organs, toxicity, enzymes, lipids, protein, biological aspects.