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Morphometric and Meristic Study of Gudusia Chapra (ham. 1822) and Gonialosa Manmina (ham. 1822) (clupeidae) from the Kaptai Lake, Bangladesh

MOHAMMAD ALI AZADI
Department of Zoology, Chittagong University, Chittagong-4331, Bangladesh

A.S.M.SHARIFUR RAHMAN
Department of Zoology, Chittagong University, Chittagong-4331, Bangladesh

Abstract/ Executive Summary:

Twenty-two morphometric and nine meristic characters of 280 Gudusia chapra (Total length 30-210mm) and 264 Gonialosa manmina (Total length 40-150 mm), the two important clupeids from the Kaptai lake, were studied during 1996-1997 to detect the plastic and non-plastic characters. Wide and medium range characters are plastic characters and hence are controlled by the environment while the narrow range characters are genetically controlled and non-plastic and hence can be used for differentiation of stock or sub-species. Three different categories of morphometric characters of the two species were recognised, viz., wide range, medium range and narrow range. Wide range morphometric characters varied within the range of 21.47% to 140.62% in the case of G. chapra and 24.04% to 87.19% in the case of G. manmina while the medium range characters varied within the range of 11.76% to 13.75% in the case of G. chapra and 11.55% to 18.92% in the case of G. manmina and less than 10% range characters were designated as narrow range. The relationships between the different morphometric characters (both dependent and independent variables) were found to be linear and in all the cases the relationships were found to be highly significant (P< 0.001).

Keywords: Morphometirc and meristic study, Gudusia chapra, Gonialosa manmina, Clupeids, Kaptai lake, Bangladesh

Location: Rangamati area of the Kaptai lake

Start Date: 00-09-1996

End Date: 00-08-1997

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

1. In the present investigation morphometric and meristics characters for each of the two important clupeids, G. chapra and G. manmina, were studied.

Methodology:

Two hundred eighty specimens of G. chapra (Total length 30-210 mm) and 264 specimens of G. manmina (Total length 40-150mm) irrespective of sex, were used to study the meristic and morphometric characters. A monthly average of 24 specimens of G. chapra and 22 specimens of G. manmina utilized for the study were collected from the fishermen catch by gill nets from the Rangamati area of the Kaptai lake during the period from September 1996 to August 1997. After collection the fishes were frozen in a freeze, and during the study period the fishes were thawed for taking all sorts of measurements. All the measurements were taken by a millimeter scale except the eye diameter and inter-orbital space which were taken by a Vernier Caliper with the accuracy of ±0.01 mm. For calculating the relationships among the different types of variables the fishes were divided into 18 length groups at an interval of 10 mm. The morphometric characters which were taken into consideration were total length (TL) and head length (HL) as independent variables. Other than these all were dependent variables i.e. standard length (SL), fork length (FL), dorsal fin length (DFL), pectoral fin length (PecFL), pelvic fin length (PelFL), anal fin length (AFL), caudal fin length (CFL), predorsal distance (PreDD), post dorsal distance (PostDD), preanal distance (PreAD), depth of dorsal fin (DDF), depth of anal fin (DAF), maximum body depth (MaxBD), minimum body depth (MinBD), distance between pectoral and pelvic fins (Dpecpel), distance between pelvic and anal fins (Dpel-anal), length of caudal peduncle (LCP), length of caudal fin (LCF), head depth (HD), eye diameter (ED) and inter orbital distance (IOD). The morphopetric measurements and meristic counts were considered. To explain the relationship between the measurements, the regression equation (Y = a + bx) was followed; where ‘x’ stands for independent variables and ‘Y’ for the dependent variables.

Source of Information: The Chittagong Univ. J. B. Sci.,Vol. 3(1 &2):pp. 21-31 , 2008

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Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The variations in the values of different meristic counts and morphological characters with those of earlier published data may be due to the different geographical location of the studied areas and ecological conditions of the water body. It is clear from the present study that the identification manuals for the fishes should be restricted to smaller geographical regions rather than the larger geographical range though most of the existing manuals or hand books cover the vast areas that may fail to provide correct information.

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