Digestive Tract Morphology and Relative Gut Length Index of Polynemus melanochir Valenciennes, 1831 in Cai Rang, Can Tho and Long Phu, Soc Trang
Main Article Content
Abstract
The study provided the digestive tract morphology, relative gut length (RGL), and the variations of this index regarding sex, season, and sampling site of the Polynemus melanochir. The analysis results of 308 fish samples (119 males and 189 females) collected from Cai Rang - Can Tho and Long Phu - Soc Trang showed that this fish displayed a wide mouth and differences based on the interaction of sex × size (ANOVA, df=1; F=4.58, p=0.03). The relative gut length (RGL=0.48±0.01 SE) falls into the group of carnivores as RGL<1 (t-test; p<0.001), so that this fish species belongs to the carnivore group. Differences in RGL were also noted among sampling site and sex, with males (0.50±0.01 SE) having a larger RGL than females (0.48±0.01 SE; t-test; p=0.02). These results have supplemented additional information regarding the nutritional characteristics of this species, and being used as a basis for understanding the ecological adaptation of this species to its habitat and as a foundation for further research on artificially raising them.
Keywords:
Carnivore, digestive tract morphology, Polynemus melanochir, relative gut length.
References
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[21] A. T. M. Nguyen, T. H. D. Nguyen, Q. M. Dinh, Morphological Characteristics of Digestive Tract and Clark Index of Ellochelon Vaigiensis (Quoy & Gaimard, 1825) in Some Coastal Estuarine Areas in the Mekong Delta, VNU Journal of Science: Natural Sciences and Technology, Vol. 38, 2022, pp. 97-103,
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[22] Q. M. Dinh, G. H. Phan, N. T. Truong, N. S. Tran, T. H. D. Nguyen, Digestive Tract Characteristics and Clark Index of Glossogobius aureus Akihito & Meguro, 1975, Can Tho University Journal of Science, Vol. 57, 2021, pp. 184-190, https://doi.org/10.22144/ctu.jsi.2021.041 (in Vietnamese).
[23] Q. M. Dinh, M. T. D. Tran, Digestive Tract Morphology, Food and Feeding Habits of the Goby Stigmatogobius pleurostigma (Bleeker, 1849) from the Coastline in Soc Trang, VNU Journal of Science: Natural Sciences and Technology, Vol. 34, 2018, pp. 46-55, https://doi.org/10.25073/2588-1140/vnunst.4740. (in Vietnamese).
[24] C. C. Tran, T. H. D. Nguyen, H. T. T. Nguyen, L. T. T. Vo, Q. M. Dinh, Diet Composition and Feeding Habit of Glossogobius sparsipapillus Caught from Estuarine Regions in the Mekong Delta, Egyptian Journal of Aquatic Research, Vol. 47, 2021, pp. 313-319, https://doi.org/10.1016/j.ejar.2021.06.001.
[2] W. J. Rainboth, Fishes of the Cambodian Mekong, FAO, Roma, 1996.
[3] V. H. Nguyen, Freshwater Fish of Vietnam, Agriculture Publishing House, III, Hanoi, 200 (in Vietnamese).
[4] Y. D. Mai, T. V. Nguyen, T. V. Nguyen, Y. H. Le, L. B. Hưa, Identification of Freshwater Fishes of South Vietnam, Science and Technology Publishing House, Hanoi, 1992 (in Vietnamese).
[5] J. Nelson, T. Grande, M. Wilson, Fishes of the World, John Wiley & Sons, New York, United States, 2016.
[6] T. K. Truong, T. T. H. Tran, Identification of Freshwater Fish in Mekong Delta, Can Tho University book store, Can Tho University, 1993 (in Vietnamese).
[7] H. Motomura, M. H. Sabaj, A New Subspecies, Polynemus melanochir Dulcis, from Tonle Sap Lake, Cambodia, and Redescription of Polynemus melanochir Valenciennes in Cuvier and Valenciennes, 1831 with Designation of a Neotype, Ichthyological Research, Vol. 49, 2002, pp. 181-190, http://doi.org.10.1007/s102280200024.
[8] H. Motomura, E. Mikschi, Y. Iwatsuki, Galeoides Günther, 1860, A Monotypic Genus of the Family Polynemidae (Perciformes), Cybium, Vol. 25, 2001, pp. 269-272.
[9] M. G. Mustafa, A. H. Rajaee, H. Hamli, K. A. A. Rahim, Biometric Indices and Population Parameters of Three Polynemid Fishes from Batang Lassa Estuary of East Malaysia, PeerJ, Vol. 9, 2021, pp. e12183.
[10] A. V. Vu, L. J. Baumgartner, M. M. Cooper, G. S. Doran, K. E. Limburg, B. M. Gillanders, J. D. Thiem, J. A. Howitt, C. M. Kewish, J. Reinhardt, Diverse Migration Tactics of Fishes Within the Large Tropical Mekong River System, Fisheries Management and Ecology, Vol. 29, 2022, pp. 708-723, https://doi.org/10.1111/fme.12566.
[11] B. Dang, Q. Vu, E. Biesack, T. Doan, O. Truong, T. Tran, A. Ackiss, B. Stockwell, K. Carpenter, Population Genomics of the Peripheral Freshwater Fish Polynemus melanochir (Perciformes, Polynemidae) in a Changing Mekong Delta, Conservation Genetics, Vol. 20, 2019, pp. 961-972, https://doi.org/10.1007/s10592-019-01189-x.
[12] T. H. D. Nguyen, Q. M. Dinh, Morphometric and Meristic Variations of Mystus albolineatus Roberts, 1994 in the Mekong Delta, Vietnam, Veterinary Integrative Sciences, Vol. 21, 2023, pp. 705-716, https://doi.org/12982/VIS.2023.051.
[13] Q. M. Dinh, Aspects of Reproductive Biology of the Red Goby Trypauchen vagina (Gobiidae) from the Mekong Delta, Journal of Applied Ichthyology, Vol. 34, 2018, pp. 103-110, https://doi.org.10.1111/jai.13521.
[14] A. Shirota, Studies on the Mouth Size of Fish Larvae, Bulletin Japanese Science Society Fish, Vol. 36, 1970, pp. 353-369.
[15] G. V. Nikolsky, Ecology of Fishes, Academic Press, London, United Kingdom, 1963.
[16] A. H. A. Hussaini, The Feeding Habits and the Morphology of the Alimentary Tract of some Teleosts Living in the Neighbourhood of the Marine Biological Station, Ghardaqa, Red Sea, Publications of the Marine Biology Station Ghardaga (Red Sea), Vol. 5, 1947, pp. 1-61.
[17] K. E. Drewe, M. H. Horn, K. A. Dickson, A. Gawlicka, Insectivore to Frugivore: Ontogenetic Changes in Gut Morphology and Digestive Enzyme Activity in the Characid Fish Brycon guatemalensis from Costa Rican Rain Forest Streams, Journal of Fish Biology, Vol. 64, 2004, pp. 890-902, https://doi.org/10.1111/j.1095-8649.2004.0357.x.
[18] Y. T. N. Nguyen, T. T. H. Lam, Q. M. Dinh, The Relative Gut Length and Gastro-Somatic Indexes of Butis koilomatodon Living in the Coastal Estuaries of Some Provinces in the Mekong Delta, TNU Journal of Science and Technology, Vol. 225, 2020, pp. 358-365.
[19] C. C. Tran, H. D. T. Nguyen, T. T. H. Nguyen, Q. M. Dinh, Gastrointestinal Tract Morphology and Clark Index of the Linecheek Tank Goby Glossogobius Sparsipapillus Caught from Coastal Estuaries of Bac Lieu and Ca Mau Provinces, Vietnam Agricultural Science Journal, Vol. 19, 2021, pp. 535-543.
[20] T. L. Tran, D. H. Hoang, Q. M. Dinh, Digestive Tract Morphology, Food Composition and Feeding Habits of the Giant Mudskipper Periophthalmodon schlosseri (Pallas, 1770) from the Coastline in Tran De, Soc Trang, VNU Journal of Science: Natural Sciences and Technology, Vol. 35, 2019, pp. 30-38, http://doi.org.10.25073/2588-1140/vnunst.4871. (in Vietnamese).
[21] A. T. M. Nguyen, T. H. D. Nguyen, Q. M. Dinh, Morphological Characteristics of Digestive Tract and Clark Index of Ellochelon Vaigiensis (Quoy & Gaimard, 1825) in Some Coastal Estuarine Areas in the Mekong Delta, VNU Journal of Science: Natural Sciences and Technology, Vol. 38, 2022, pp. 97-103,
https://doi.org.10.25073/2588-1140/vnunst.5456. (in Vietnamese).
[22] Q. M. Dinh, G. H. Phan, N. T. Truong, N. S. Tran, T. H. D. Nguyen, Digestive Tract Characteristics and Clark Index of Glossogobius aureus Akihito & Meguro, 1975, Can Tho University Journal of Science, Vol. 57, 2021, pp. 184-190, https://doi.org/10.22144/ctu.jsi.2021.041 (in Vietnamese).
[23] Q. M. Dinh, M. T. D. Tran, Digestive Tract Morphology, Food and Feeding Habits of the Goby Stigmatogobius pleurostigma (Bleeker, 1849) from the Coastline in Soc Trang, VNU Journal of Science: Natural Sciences and Technology, Vol. 34, 2018, pp. 46-55, https://doi.org/10.25073/2588-1140/vnunst.4740. (in Vietnamese).
[24] C. C. Tran, T. H. D. Nguyen, H. T. T. Nguyen, L. T. T. Vo, Q. M. Dinh, Diet Composition and Feeding Habit of Glossogobius sparsipapillus Caught from Estuarine Regions in the Mekong Delta, Egyptian Journal of Aquatic Research, Vol. 47, 2021, pp. 313-319, https://doi.org/10.1016/j.ejar.2021.06.001.