الفهرس 
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Abstract
Trachurus indicus is one of the important commercial fishes worldwide. Temperature is the most important factor that affects growth of fish. The present study is the one of first to give the length weight relationship (LWR) seasonally for the Arabian scad Trachurus indicus. Statistically growth was found to be negative allometric (b<3) in autumn and winter seasons and at the whole year, while it was found to be isometeric (b=3) at spring season. The length and weight measurements of 1120 specimens of T. indicus (369 individual in autumn with total Length range 9 – 18.9 cm & weights 9.6 -61.21 g, 372 individual in winter of length range 10 – 21.9 cm and weight range11.9 – 90.7 g and 379 individual in spring of length range 11 – 16.9 cm and weight range 18- 45.4 g were used for the estimation of length weight relationship. Data showed that there are significant differences in mean values of (H.S.I.), (G.S.I.) and condition factor of fish between different seasons. The averages of (GPT) were 48.5, 52.9 and 51.1; meanwhile, the averages of (GOT) were 41.0, 42.8 and 30.3 U/ml at autumn, winter and spring respectively. The averages of total protein were (15.60 %), (14.93 %) and (17.80%); meanwhile, the averages of total lipids were (10.02 %), (10.88 %) and (10.71 %); at autumn, winter and spring respectively. The histological analysis of male and female gonads revealed the seasonal development of fish gonads. The histological analysis and gonadosomatic index values make obvious that spawning season is at summer season.