Abstract
A study on the nutritional characteristics of Soldier croaker Nibea soldado (Lacepède, 1802) was conducted from January to June 2019 in coastal areas from Soc Trang to Ca Mau provinces. Fish samples were collected monthly by trawl-net (engine capacity of 70 CV) with two groups of sizes such as juvenile (total length of 114-170 mm- small fish) and adults (total length of 209-370 mm- big fish). The results showed that the fish have wide mouth, long mouth and slanting; the jaw is very developed; gill rakers were sparse, short and hard to hold feed; esophagus was short, thick wall, with many folds; stomach was greatly expanded with the posterior portion, forming as a long sac, thick wall and many folds inside; caeca has 8-9 tubes with a sealed end attached to between the stomach and intestines; intestine was short, thick wall and folded in S-shape. Relative length of the gut (RLG)
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