الفهرس 
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Abstract
Nowadays, fish, especially marine fishes; are considered a very important source of animal protein for most of human beings. from this point, this study have been applied on 600 marine fish (200 Mugil cephalus, 200 Siganus revulatus, 200 Sardinella sp ) which have been randomly collected from Mediterranean sea at different seasons with different sizes and body weights.
The results are summarized as follow:
1) the main clinical signs revealed detatched scales with some erosions, Sluggish movements, with rubbing the body against objects and sides of aquaria, loss of condition and abdominal distention and somewhat emaciation. Some fishes show Isopoda attatched to the gills with sever slimness.
2) The post mortem findings were manifested as Marbling of gills with excessive mucus secretion, sticking of the gill tips and show sever congestion. liver was pale and anemic with peticheal haemorrhage and In some cases, was congested.
3) The total percentage of parasitic infestation among examined fishes was22%. The highest percentage was recorded among Sardinella sp (37.5%) followed by Mugil cephalus (19%) while the lowest percentage was in Siganus revulatus (9.5%).
4) the isolated parasites were:
- Nematode parasites: the total nematode infestation among the examined fishes was 8.5% by Anisakis simplex.
The high percentage was detected in M. cephalus (16%) followed by (9.5%) in S. revulatus.
- Crstacean infestation: the total Crstacean infestation among the examined fishes was(11.6%) by Rocinela sp.
It was detected only in Sardinella sp. With percentage (35%).
-Myiasis infestation: the 1st larval stage of myiasis were detected in M.cephalus with percentage (3%).
The 3rd larval stage of myiasis were detected only in Sardinella sp with percentage (2.5%).
5) the seasonal percentage of parasitic infestation among M.cephalus , S. Revulatus and Sardina was the highest in spring for all (40.6%) and the lowest in winter (4%). In M.cephalus the highest percentage was (30%) in spring and the lowest was (8%) in winter, in S. Revulatus the highest percentage was (16%) in spring and the lowest was (0%) in winter, while in Sardina the highest percentage was (76%) in spring and the lowest was (4%) in winter.
6)the seasonal percentage of nematodes infestation among M.cephalus , S. Revulatus and Sardina was the highest in spring (12.6%) and the lowest in winter (2.66%). In M.cephalus the highest percentage was (22%) in spring and the lowest percentage was (8%) in winter . in S. Revulatus the highest percentage was (16%) in spring and the lowest was (0%) in winter.
7) the seasonal percentage of crustacean infestation among M.cephalus , S. Revulatus and Sardina was the highest in spring (23.3%) and the lowest in winter (1.33%). The crustacean infestation only detected in Sardine fish .
8) the seasonal percentage of 1st larval stage of myiasis infestation among M.cephalus was the highest at spring (8%) and the lowest in summer (4%).
9) the seasonal percentage of 3rd larval stage of myiasis infestation among Sardina was the highest at spring (6%) and the lowest in summer (2%).
10) in the examined M.cephalus there is a positive correlation between nematodes infestation and length of M.cephalus. while there is a negative correlation between 1st larval stage of myiasis and length of M.cephalus.
11) in the examined S. Revulatus ,there is a positive correlation between nematodes infestation and length of S. Revulatus.
12) in the examined Sardina ,there is a positive correlation between crestacean infestation, 3rd larval stage myiasis and length of Sardina.
13) there is a positive correlation between nematode infestation and weight of M.cephalus and negative correlation between 1st larval stage myiasis and weight of M.cephalus.
14) there is a positive correlation between parasitic infestation and weight of S. Revulatus.
15) there is a positive correlation between crustacean infestation and weight of Sardina and there are no correlation between 3rd larval stage myiasis and weight of Sardina.
16) Non infested fishes have the ability to accumulate higher level of metals than infested fish by parasitic nematodes.
17) In S. revulatus ,Highest level of Pb were detected in the non infected liver (0.176) g/g in spring season while the lowest level were detected at the infested musculature (0.047) g/g at spring season.
18) In S. revulatus ,Highest level of Cu were detected in the non infected gills (1.919)g/g in spring season. while the lowest level were detected in the infested musculature (0.132) g/g in winter season.
19) In S. revulatus , Highest level of Cd were detected in the non infected gills (0.143)g/g in autumn season. while the lowest level were detected in the infested musculature (0.005) )g/g in spring season.
20) In M.cephalus, Highest level of Pb were detected in the non infected gills (1.11)g/g in autumn season. While the lowest level were detected in the infested musculature (0.0166)g/g in spring season.
21) In M.cephalus, Highest level of Cu were detected in the non infected gills (7.973)g/g in autumn season. While the lowest level were detected in the infested musculature (0.557)g/g in spring season.
22) In M.cephalus, Highest level of Cd were detected in the non infected gills (0.097)g/g in winter season. While the lowest level were detected in the infested musculature (0.003)g/g in summer and winter season.