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Taxonomic Comparison of the Populations of Climbing Perch, Anabas Testudineus (bloch) in Bangladesh

M.M. Hassan
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University Mymensingh-2202

M.G.Q. Khan
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University Mymensingh-2202

M.A. Hasanat
Fish Hatchery and Training Centre, Raipur, Laxmipur

Abstract/ Executive Summary:

A study on the taxonomic comparison of five populations of the climbing perch, koi, Anabas testudineus was conducted from five regions of Bangladesh viz. Chittagong, Dhaka, Khulna, Rajshahi and Sylhet. The comparison was based on the morphometric and meristic data of the populations collected over a period of 4 months from July to October 2003. The average total length, standard length, postorbital length, eye diameter, length of base of the dorsal and anal fin of the population of Khulna region were higher than those of the other four populations. All the population characteristics of Chittagong region revealed a significant differences (P<0.05) than those in Khulna.

A study on the taxonomic comparison of five populations of the climbing perch, koi, Anabas testudineus was conducted from five regions of Bangladesh viz. Chittagong, Dhaka, Khulna, Rajshahi and Sylhet. The comparison was based on the morphometric and meristic data of the populations collected over a period of 4 months from July to October 2003. The average total length, standard length, postorbital length, eye diameter, length of base of the dorsal and anal fin of the population of Khulna region were higher than those of the other four populations. All the population characteristics of Chittagong region revealed significant differences (P<0.05) than those in Khulna.

Keywords: Anabas, Morphometric & Meristic character, Monotypic, Taxonomic variability

Location: In Bangladesh: Chittagong, Dhaka, Khulna, Rajshahi and Sylhet

Start Date: 00-07-2003

End Date: 00-10-2003

Program Area: Comparative study

Commodity: Koi/Climbing

Objectives:

Researches on taxonomic identification and culture of Indian major carps and Chinese carps are being performed in our country. However, taxonomic delimitation of the populations of Koi, climbing perch is lacking. The purpose of the study was to identify the morphological variation of this particular species in five divisional regions, viz., Dhaka, Rajsh.-thi, Khulna, Chittagolig and Sylhet in Bangladesh.

Methodology:

Collection of sample Taxonomic comparison of A. testudineus Samples were collected from the local markets of Sonargoan Upazila (Dhaka division), Shetakondo Upazila (Chittagong division), Botiaghata Upazila (Khulna division), Shibgonj Upazila (Rajshahi division) and Nobigonj Upazila (Sylhet division) during the months of July to October 2003 that represented five distinctive populations. A total of 50 specimens were collected from each locality. Preservation of sample The fishes were washed with water and preserved in 10% formalin. The jars were labeled containing information such as place and date of collection and name of the specimens.

Morphometric and meristic data collection The morphometric data were recorded using normal centimeter-scale, divider and forceps, recorded to the nearest cm. The morphometric characters viz., total length, standard length, head length, body depth, pre-and postorbital length, eye diameter, length of pectoral fin base, length of base of the dorsal fin, length of base of pelvic fin and anal fin were recorded separately. The standard length was measured from tip of the snout to the base of the caudal fin. The total length was measured from the tip of the snout to the longest ray of the caudal fin. Meristic characters with respect to fin rays were counted including the smallest anterior rudiments. The countable characteristics such as no. of dorsal fin rays, no. of pectoral fin rays, no. of pelvic fin rays, anal fin rays and caudal fin rays, no. of lateral line scale, no. of scales above and below the lateral line were recorded. Data analysis All the measured data were accumulated and analyzed by Analysis of variance (ANOVA) for test of significance.

Source of Information: J. Bangladesh Agri!. Univ. 3(2): 297-302, 2005 ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

There has been a considerable controversy whether the genus Anabas is monotypic or comprises more than one species. Rao (1968) showed that there are two distinct species and gave the name A. oligolepis to the second species. The variation of different characters Particularly the meristic ones need to be justified for actual taxonomic identity of this species. Research on genetic variability of the koi populations of these five distinct regions may be carried out to locate their genetic distance. Different molecular marker technology may Provide valuable information on the genetic status of these species.

Knowledge Management: Journal