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Histological and Histomorphometric Aspects of the Digestive System of the Taki Fish, Channa Punctatus (bloch-schneider, 1801)

M. Niamul Naser
Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh.

Tonima Mustafa
Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh.

Abstract/ Executive Summary:

The histoanatomical and histonumerical analysis of the digistive system of Channa puntatus was made. It’s digestive tract was short in length. The digestive system includes large mouth with sharp teeth, highly distensible oesophagus, a large stomach, a number of pyloric caecae and a short intestinal tract. The mucosal layer of the oesophagus is highly folded, the stomach was distinct with strong and branched villi and the intestine was short with long villi.

Keywords: Histology, Histomorphometric, Digestive system, Taki fish

Location:

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

To know the histoanatomical details of the digestive system of taki fish as a representative of carnivorous and predatory fishes.

Methodology:

For histological investigations, five live nondiseased specimens of C. punctatus were collected from fishermen, caught from the local beel of Manikganj on 12 June 2002. The size of the fishes varied from 24.5 to 27.77 cm in lengths and 200 to 230 g in weights. At first, the fishes were removed from the water by means of a hook or nets and quickly transferred to a container containing anaesthetic benzocaine. The alimentary canal and digestive glands were carefully dissected out from the fishes and cut them into blocks of about 1.0 cm in length. The tissues of different parts of the digestive system were fixed at l0% neutral buffered formalin to avoid post mortem changes and were kept in separate vials with proper labels. All the fixed tissues were processed in automatic tissue processor and embedded in paraffin wax at 56ºC to 58ºC and sections were cut at 3-4 micro metre. The sliced tissues were stretched in clean slides. After a hydration process using descending graded concentration of alcohol, the tissues were stained in hematoxyline and eosine and mounted on slides with DPX. The prepared slides were observed under a compound microscope (Olympus XX3, 2003). The pictures of the tissues were taken with the help of an Olympus camera attached to the same microscope. For morphomatric analysis, the measurements of various tissue layers were taken with the help of an ocular and a stage micrometer mounted in a compound microscope. The measurements were converted to relative thickness of a layer of tissue in (μ/the total thickness of the gut wall in μ) × l00.

Source of Information: Bangladesh J. Zool. 34(2): 205-212, 2006

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It’s digestive tract was short in length. The digestive system includes large mouth with sharp teeth, highly distensible oesophagus, a large stomach, a number of pyloric caecae and a short intestinal tract. The mucosal layer of the oesophagus is highly folded, the stomach was distinct with strong and branched villi and the intestine was short with long villi. In conclusion, it could be mentioned that the per cent measurements of different histological layers of the gut walls and their variations correlated to the histological variation of the alimentary canal of C. punctatus is adapted histologically and histomorphometrically to suit the life of carnivore fish.

Knowledge Management: Journal