The current study was conducted from October 2013 until the beginning ofSeptember 2014 to estimate the Omega -3fatty acid for three species of marine fish(Acanthopagrusarabicus , Chelonsubviridis and Cynoglossusarels). The study wasconducted during the four seasons winter of 2013, spring of 2014 , summer of 2014and fall of 2014. The oil was extracted by organic solvent extraction, the fatty acidwas estimated using Gas Chromatography connected with mass spectrometry(calculated on the basis of the total amount of the fatty acids), omega–3 percentage ofboth types DHA, EPA has varied between the fish as it reached 56.5% , 55.9% ,67,13% , 49.22% during winter, spring, summer and autumn respectively. Also it wasfound ,by the results, that the percentage of omega -3 type EPA was high in the winteras the percentage was 30.99%, followed by the summer as it was 30.42% and thelowest rate was in the autumn as it was 20.33%, while the percentage of the secondtype of omega -3 DHA was close during the four seasons, as the summer achieved thehighest percentage which was 36.71% and the lowest percentage was in the winter asit reached 25.06%.

The present work is designed to anatomical, histological and histochemical studyof the proventriculus of common moorhen (Gallinula chloropus). Thirty adultcommon moorhen which obtained from a commercial market of (Al Basra city) wereused in this study, and the work conducted at veterinary medicine collage –universityof Basra. The anatomical study revealed that the proventriculus of common moorhenwas tubular in shape with average mean of its length and width (20.00±.7906mm),(10.48±.1.53194mm) respectively. The internal surface of the proventriculuswas smooth and raising no papilla. The proventriculus connect with esophaguscranially and with muscular stomach caudally, It lies essentially in the vertical plane.The histological study showed that the proventriculus of common moorhen consist offour tunics (mucosa, submucosa, muscularis externa and serosa).The mucosal layer ofcharacterized by branched longitudinal folds (villi) lined by simple columnarepithelium, the sub mucosal layers manifested by presence of compound tubularglands which was arranged in pyramidal or conical shape (adenomere), whilemuscularis externa consist of two layers longitudinal inner and outer layer wascircular. The tunica serosa composed of loose connective tissue covered bymesothelum. The statistic analysis revealed that the average lengths of villi andadenomere were (74.50 ±14.72mm), ( 107.63±45.81mm) respectively, while theaverage width of villi, tunica sub mucosa, adenomere, muscularis externa and serosawere (8.75±2.36 mm), (143.12±30.37mm), (85.62±54.76mm), (22.12±6.29mm),(2.50±.00mm) respectively. The histochemical study of proventriculus showed thatthe carbohydrate have positive reaction with shiff reagent in the surface epithelium sub mucosal glands, tunica muscularis and serosa. While the glycogen granulesdistributed in the epithelium, around the sub mucosal glands and in tunica muscularis