Effect of linolenic acid and linoleic acid on growth, fatty acid composition
and histological changes in green catfish (Mystus nemurus Cuv. & Val.)
ผลของกรดลิโนลีนิค และกรดลิโนลีอิค ต่อการเจริญเติบโต องค์ประกอบของกรดไขมันและ
การเปลี่ยนแปลงทางเนื้อเยื่อในปลากดเหลือง
Maimunoh Midcadee, M.Sc. Student in Aquatic Sci., PSU.
Wutiporn Phromkunthong, Assoc. Prof., D. of Aquatic Sci., F. of Natural Resources, PSU.
Corresponding e-mail : pwutipor@ratree.psu.ac.th
Grant : Government Budget
Presented : The 26th Congress on Science and Technology of Thailand, 18-20 October 2000,
Bangkok
Key words : linolenic acid, linoleic acid, fatty acid composition, Mystus nemurus
Green catfish (Mystus nemurus) fingerlings of initial average weight 4.38 g were experimen-tally reared in a 10-week experiment with the feeds containing varying levels of essential fatty acids. The treatment where the fish were given the feed with linoleic acid supplementation showed higher average weight increment as well as total weight increase and specific growth rate as compared to
those in the treatments without such supplementation. There were no differences in the feed conver-sion ratio, protein efficiency rate, net protein utilization and survival among all the treatments. The analysis of the whole body for the lipid content showed higher lipid content in the fish groups with linoleic and linolenic acid supplementations. The moisture, ash and protein contents as analyzed from the whole body and the fish flesh showed no correlation with the supplementation of either kind of
fatty acids. There was no difference in fat composition in the liver in all the treatments. It is noted, however, the fatty acid composition in liver were quantitatively as well as qualitatively different. The histopathological changes of cells were recorded in the fish given the feeds without fatty acid and
with stearic acid supplementations while those in other treatments showed the presence of vacuoles in liver cells.
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