Characterization of giant mottled eel (Anguilla marmorata) gastrointestinal tract that origin from Thua Thien Hue, Vietnam.

Abstract

Research Article to establish knowledge on their feeding ecology. Resh et al. [14] investigated the diet of A. marmorata and A. obscura in Rivers in the tidal zone in Moorea Island, French Polynesia. The low number of individuals studied does not allow for any firm conclusions to be drawn on their diet [14]. A study of Butler and Marshall [15] demonstrated that A. labiata in the upper Kairezi River, Zimbabwe predominantly fed on freshwater crustaceans [15].This study investigated the dietary component and morphology of the digestive tract of Anguilla marmorata during its yellow stages (non-migrants). A total of 127 samples, ranging in total length from 17-108 cm and weight from 10-3200 g were collected from Thua Thien Hue, Vietnam. The structure of the gastrointestinal tract indicated that Anguilla marmorata has the typical characters of carnivorous fish such as a wide mouth, small teeth in bands; free tongue; short esophagus, stomach, and intestines made up of folds. The mouth size of Anguilla marmorata ranged from 1.81-6.6 cm and it increased with the body weight of fish. Anguilla marmorata is an animal-eating species with an RLG (relative length of the gut) ranging from 0.34 to 0.41 (RLG <1). Crustacea is the preferred food of eels with the highest proportion of the number, weight, and frequency of crustaceans in the gastrointestinal tract with 65%, 64%, and 80%, respectively. Crustacea was also the most important food of Anguilla marmorata in the wild with the index of relative importance (IRI%)=79%. Correlation equation between length (L=17-108 cm) and weight (W=10-3200 g) of Anguilla marmorata is L=9.948W 0.0622 with correlation coefficient R 2 =0.93. Our report provides new dietary information about A. marmorata that is useful in nutrition planning and aquaculture potential.

Nutritional Composition and Lipid Content of Skin and Muscle of Wild Giant Mottle Eels Anguilla Marmorata in Thua Thien Hue, Vietnam

“…In this study, the protein content of wild eel flesh is 19.54 ± 4.31%, higher than that of A. marmorata (17.17 ± 0.71%) and A. bicolor bicolor (16.78 ± 2.8%) [12]. The high protein content of eel flesh is related to the animal-based diet, with the preferred food being the crustaceans [10].…”

“…The nutritional composition of the fish fluctuates, depending on internal and external factors [21], such as species, age, gender, stage of development, diet, and habitat [6,21]. Similarly, the nutritional content of wild eels is expected to vary with the growth stages by the differences in natural foods [10,5].…”

Research Article Using DNA barcodes based on mitochondrial <i>COI</i> and <i>16S</i> <i>rRNA</i> genes to identify <i>Anguilla</i> eels in Thua Thien Hue province, Vietnam

“…In previous studies, the Anguilla eel was identified in Thua Thien Hue, Vietnam (Huyen and Phu, 2014). Anguilla marmorata is considered to be a widely distributed species, with high economic value (Huyen and Linh, 2019). The species composition of A. bicolor has been determined to the species level, but its subspecies have not been determined by morphological analysis (Phu and Dang, 2008;Phu and Ha, 2008;Hoang and Duc, 2012).…”

Multiple population structure of the giant eel Anguilla marmorata in Thua Thien Hue, Vietnam base on COI sequences

“…In Viet Nam, there were 5 out of 19 species belong to the genus Anguilla (Watanabe et al 2004;2005), A. marmorata (Quoy & Gaimard, 1824) was identi ed to appear in the central region of Vietnam from Nghe An to Khanh Hoa (Nguyen et al 2018). In This province, A. marmorata is widely distributed, exploited and cultivated with a high economic value (Huyen and Linh 2019). The species has a catadromous life-history strategy with distances from several hundred to thousands of kilometers when they were white grass eels from North ocean to South East Asian sea (Linh et al 2010).…”