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Length-weight Relationship and Relative Condition Factor of the Ribbon Fish, Lepturacanthus Savala (cuvier, 1829) from the Bay of Bengal, Bangladesh

MOHAMMAD ALI AZADI
Department of Zoology, University of Chittagong, Chittagong 431, Bangladesh

MOHAMMAD ULLAH
Department of Zoology, University of Chittagong, Chittagong 431, Bangladesh

Abstract/ Executive Summary:

Length-weight relationship of 1119 specimens of Lepturacanthus savala (Cuvier 1829) from the Bay of Bengal, Bangladesh, was found to be curvilinear (W= 0.0003612 TL^3.18) and linear (LogW= -3.44+3.18 LogTL) for both the sexes combined in arithmetic and logarithmic scales, respectively. The values of regression co-efficient (b) ranged from 3.002 to 3.337 (ß ± 0.167) at 95% confidence limit. The regression „b? value (3.18) followed the cube law and did not significantly (P>0.05) differ from the cube. The growth of the fish was found to be isometric. Relative condition factor (Kn) was also within the ideal range (0.9695 to 1.1155, mean 1.001 ± 0.033). Seasonal or in different length groups no dramatic changes in relative condition factor were observed. Length frequency distribution was found to be normal with maximum number of fish in mid length groups and minimum in the lowest and highest length groups.

Keywords: Length-weight relationship, Relative condition factor, Lepturacanthus savala, Bay of Bengal, Bangladesh

Location: Department of Zoology, University of Chittagong, Chittagong

Start Date: 00-03-2003

End Date: 00-02-2004

Program Area: Animal Health and Management

Non-commodity: Resource inventory

Objectives:

1. To detect the physical well-being of the fish and to establish the fact whether the growth of the fish is isometric or not, because knowledge about the growth of fish is the most important part of the study of population dynamics and also for its cultural purposes.

Methodology:

For the study of length-weight relationship and relative condition factor a total of 1119 specimens of L. savala were collected from the biggest Bay fishing landing station namely “Fishery Ghat” at Iqbal Road, Chittagong, Bangladesh, during March 2003 to February 2004. The total body length and weight of each fish was measured to the nearest centimeter and gram from the tip of the snout to the tail end of the body, and with a pan balance sensitive up to 0.1 g, respectively. The length-weight relationship and relative condition factor (Kn) were derived. The Co-efficient of regression for Y (Weight) on X (Total length) was calculated by least square method. Monthly size frequency distribution was also analysed.

Source of Information: The Chittagong Univ. J. B. Sci.,Vol. 3(1 &2): pp. 119-126 , 2008

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest Kn value 1.1155 was found at 25 to 30 cm length group and lowest 0.9695 at 40 to 45 cm length group with a mean of 1.001 ± 0.033. Monthly highest Kn value was found in January 2004 (1.005 ± 0.028) and lowest in May 2003 (0.998 ± 0.014). In different months the fluctuations of Kn values were very negligible. The monthly mean Kn values were always around 1. Except for a slight variation in only one lowest size group (25-30 cm), no major variation was found in different length groups. It clearly indicated that the growth pattern of the fish was ideal in the Bay of Bengal. Kn values generally fluctuated with changing seasons, amount of food supply, and maturity of gonads. In the present study no such effect was observed on Kn values due to the ribbon shaped long body and gonads; no major effect was also resulted due to the maturity of the gonads.

Knowledge Management: Journal