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Relationship Between Total Length and Digestive Tract of Different Carnivorous Fishes

M. M. Rahman
Youth Training Centre, Department of Youth and Sports, Bangladesh

M. M. M. Alam
Upazila Fisheries Officer
Department of Fisheries, Bangladesh

T. Zaman
Deputy Coordinator
Youth Training Centre, Department of Youth and Sports, Bangladesh

Abstract/ Executive Summary:

The study was conducted to find out the relationship between total length and alimentary canal of different carnivorous fishes. The morphometry associated with the feeding and digestion of one hundred eighty fishes of 9 species was studied. It was observed that well-defined sharp teeth were present on both jaws of the fishes examined. It was also found that the fishes had rough surface pharyngeal pads. The total length of Johnius koitor, Channa orientalis, Channa punctatus, Mvstus vittatus, Glossogobius giuris, Nandus nandus, Eleotris fusca and Anabas testudineus were 1.28 to 1.72, 2.90 to 3.17, 2.22 to 2.70, 2.00 to 2.40, 3.00 to 4.50, 1.20 to 1.50, 1.40 to 2.36 and 1.48 to 1.64 times greater than the intestinal length, respectively and the intestinal lengths were 5.45 to 6.02, 1.30 to 1.70, 1.70 to 2.10, 3.60 to 4.10, 2.10 to 2.50, 2.90 to 3.20, 2.00 to 12.00 and 3.00 to 5.30 times longer than the stomach of the fishes, respectively. The total length of Xenontodon cancila was 9.20 to 9.80 times greater than the intestinal length and the stomach length was 1.90 to 2.20 times greater than the intestinal length with an average of 2.00 times.

Keywords: Body length, Digestive tract, Carnivorous fish

Location: The fishes were collected from the local markets of Bangladesh.

Start Date: 00-07-1998

End Date: 00-08-1998

Program Area: Variety and Species

Commodity: Fish

Objectives:

To establish a relationship between the body length and the gut length of the fishes.

Methodology:

Nine freshwater fish species were selected depending on their availability and importance. The fishes were J. koitor, C. orientales, C. punctatus, which are closely related in their body shape, known as koitor, raga and lata, respectively. The other fish species were M. vittatus, X. cancila, G. giuris, N. nandus, E. fusca and A. testudineus are locally known as tengra, kakila, bele, bheda, boiragi or culti and koi respectively. These fishes are popular in South- East Asia and once they were abundant in freshwaters of Bangladesh. They are delicious and have good market demand. The fishes were collected from the local markets of Bangladesh. Most of the fish species were collected in fresh condition from Mymensingh fish market, but only two species i.e., J. koitor and E. fusca were collected from Barishal region of Bangladesh. Twenty individuals of different sizes of each species were collected. The study was performed for a period of two months from July to August 1998 in the laboratory of the Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh. Data were presented here as range value or mean ± SD. The relationship between TL and SmL or TL and ItL were carried out by regression co-efficient method using MS Excel.

Source of Information: Progress. Agric. 23(1 & 2): 39 – 49, 2012 ISSN 1017-8139

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Fisheries resources play important roles in poverty alleviation, employment generation, nutrition and foreign currencies earning, traditions and food habit of the people of Bangladesh. It is endowed with diversified fisheries resources enriched with variety of indigenous fish species. Due to different man-made and natural reasons, the Bangladesh fisheries are now under great threat. To improve the production and aquatic biodiversity, biological management of natural water bodies as well as new fish species for aquaculture should be introduced. During the present study, nine fishes were examined to study the morphology associated with the digestive systems of the chosen fishes and to study the relationship between the body length and the gut length. As it was found, well-defined sharp teeth were present on both jaws of the fishes examined. It was also noticed that the fishes had rough surface pharyngeal pads. It was observed that the total length was 1.28 to 1.72 times greater than that of the intestinal length of J. koitor and intestinal length was 5.45 to 6.02 times greater than that of the stomach length. The total length of C. orientalis was 2.90 to 3.17 times greater than the intestinal length. The intestinal length was 1.30 to 1.70 times greater than that of the stomach of the fish. The total length of C. punctatus was 2.22 to 2.70 times greater than the intestinal length. The intestinal length was recorded 1.70 to 2.10 times greater than that of the stomach. The total length of M. vittatus was 2.00 to 2.40 times larger than that of the intestine. The intestinal length was 3.60 to 4.10 times greater than that of the stomach length. The total length of X. cancila was 9.20 to 9.80 times greater than the intestinal length. The stomach length was 1.90 to 2.20 times greater than the intestinal length of the fish. The total length of G. giuris was 3.00 to 4.50 times greater than the intestinal length and the intestinal length was 2.10 to 2.50 times greater than that of the stomach length. The total length of N. nandus was 1.20 to 1.50 times greater than the intestinal length. The intestinal length was 2.90 to 3.20 times greater than that of stomach length. The total length of E. fusca was 1.40 to 2.36 times greater than the intestinal length and the intestinal length was 2.00 to 12.00 times greater than that of the stomach length. The total length of A. testudineus was 1.48 to 1.64 times greater than intestinal length. The intestinal length was 3.0 to 5.30 times greater than that of stomach length. Finally, as it was identified, all fishes examined were carnivorous, therefore, to rear these fish live small animals or supplementary feeds of animal origin will be required. Further research should be undertaken to find out the impact of stomach length and intestine length on supplementary feeds and growth rate of the fishes.

Knowledge Management: Journal