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Morphometry of Bengal Eyed Turtle Morenia Peters (anderson 1879)

Md. Lokman Hossain
Department of Zoology, Dhaka College, Dhanmondi, Dhaka-1205, Bangladesh.

Shorab Uddin Sarker
Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh.

Noor Jahan Sarker
Department of Zoology, University of Dhaka, Dhaka-1000, Bangladesh.

Abstract/ Executive Summary:

The study on the morphology of Bengal eyed turtle, Morenia petersi (Anderson, 1879) was made between January 1997 and December 2000 in Narayanganj, Chandpur, Manikganj, Dhaka and Madaripur Districts of Bangladesh. The mean weight of adult male was 640.6±165.4 g and of female 794.5±194.89 g. The length and width of carapace as well as those of the plastron and the height of the shell varied with the body weight of the turtle. The percentage of hard parts of the body weight of M. petersi was 35.9±1.3% and soft parts was 64.3±1.2%, respectively.

Keywords: Morphometry, Bengal eyed turtle

Location: Narayanganj, Chandpur, Manikganj, Dhaka and Madaripur districts

Start Date: 01-01-1997

End Date: 31-12-2000

Program Area: Variety and Species

Commodity: Turtle

Objectives:

To study the morphometry and biometry to ascertain the growth ratio in relation to body weight.

Methodology:

Morphometric study of length, width of carapace as well as those of the plastron and the height of shell and weight measurements were made at Baidder Bazar, Sonargoan upazila; Bot-toli, Jamtoli and Ghudara ghat of Narayanganj district; Matlab Bazar (bridgeghat), Matlab upazila local markets, Kaliatoli Bazar, Koiar-pool turtle market of Haziganj upazila and Chandpur sadar turtle market under Chandpur district; Patkeel Bazar, Kadambari beel of Madaripur district; Zitka bazar, Sebalaya local market, Gopinathpur sadar turtle market of Manikganj district; Mirpur section 10 and Ghudaraghat No 1, Tipu sultan Road, Uttara Section 12 & 14 and Kamalapur turtle export centre, Sham Bazar and Laxmi bazar turtle market under Dhaka district. A total of 200 Morenia petersi were used for morphometric analysis. Curve carapace was measured from tip of nuchal shield to end of pygal and curve plastron width measured from middle of inframarginal shield left to right side. Straight plastron was measured from the tip of intergular to end of anal shield. The shell height was measured with taxonomic board in perpendicular way. For convenience of statistical analysis, the males and females were separated into weight group for the study of frequency distribution. The relationship between the body weight and surface area of carapace and plastron was considered. The distribution of number and percentage of males and females were determined. The relationship between length and weight of turtles was determined with a view to know growth ratio by means of regression analysis using least square methods from the original data at confidence level 95%. The regression co-efficient and correlation co-efficient were applied by means of ‘t’-statistic at 5% level of probability. The estimated weight was plotted against the corresponding length, width and shell height to obtain a linear curve distribution. Growth rate of various morphometric characters in relation to body weight of turtles was determined using the standard methods. For biometric study turtles were dissected and measured them on the basis of three categories i.e. hard parts (Carapace and plastron), soft parts (forelimbs, hindlimbs, neck, liver, heart and digestive tract) and other soft parts (blood, spleen and residue). Percentage of different organs in relation to body weight was also calculated. Bengal eyed turtles were captured from nature and also collected from export centers and local markets to identify their sex. Male M. petersi was smaller in size and possessed a comparatively longer tail with thick base. Male also possessed white band on the top of the tail, while female possessed yellow band. Data were analyzed by Excel and SPSS (Version 10.00) for all the statistical analysis. Data relating to the various body measurements of M. petersi and the significance of correlation co-efficient has been examined with the help of ‘t‘ statistics. Regression analysis between two sexes was made to find out the relationship and difference by means of different parameters. The difference between sets of data for given parameters were subjected to analysis of variance (ANOVA).

Source of Information: Bangladesh J. Zool. 42(1): 57-66, 2014

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The length and width of carapace as well as those of the plastron and the height of the shell varied with the body weight of the turtle. The percentage of hard parts of the body weight of M. petersi was 35.9±1.3% and soft parts was 64.3±1.2%, respectively. The longest Curve Carapace Length (CCL) of male M. petersi was 22.1 cm and Curve Carapace Weight (CCW) 20.8 cm, Plastron Length (PL) 19.1 cm, Plastron Width (PW) 14.2 cm and the Shell Height. Mean body weight (BW) of females was slightly higher than males. The female was higher domed and had relatively shorter tails with the vent under carapace and unserrated posterior rim.

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