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Length-weight Relationship and Relative Condition Factor of Pond-reared Masheer, Tor Putitora (ham.)

M.S. Islam
Division of Applied Biosiences, Faculty of Fisheries, Graduate School of Agriculture, Kyoto University, Japan

M.A. Mazid
Bangladesh Fisheries Research Institute, Mymensingh 2201, Bangladesh

M.G. Hussain
Bangladesh Fisheries Research Institute, Mymensingh 2201, Bangladesh

S. Dewan
Department of Fisheries management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

The study deals with length-weight relationship and relative condition factor of masheer, Tor putitora reared for 150 days in ponds. The logarithmic form of equation for the relationship was found to be logW=-1.727+2.875logL or W=0.01875L^2.875. The graphical presentation of the parabolic and logarithmic forms showed respectively the curvilinear and linear relationships between length and weight of the fish. The mean value (±sd) of relative condition factor was found to be 0.95±0.12. The exponential value ‘b’ was found to be 2.96 and the coefficient of correlation ‘r’ was 0.965, which showed strong and highly correlated relationships between length and weight of the fish.

Keywords: Length-weight relationship, Tor putitora, Relative condition

Location: Bangladesh Fisheries Research Institute, Mymensingh

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To establish the length-weight relationship of pond-reared Tor putitora.

Methodology:

Hatchery produced fingerlings of mahseer with average total length of 11.80 cm and body weight of 12.50g were reared with supplementary feeding under fertilized condition for a period of 150 days in earthen ponds of Bangladesh Fisheries Research Institute, Mymensingh. At harvest, average total length and weight were 20.25cm and 85.60g respectively. Fish were sampled fortnightly and total length and weight of individual fish were recorded. Therefore, large volume of data on length and weight of fish at different ages and sizes were obtained. Total length of each individual fish was measured to the nearest centimeter on a scale. Weight was taken to the nearest gram (g) on a sensitive electronic balance. For calculation data were divided into 12 class intervals and the frequency for each class interval was found out. The regression line of length-weight relationship was drawn by plotting the body weight data against the total length data. Again, all the mid-values (cm) of the class intervals and the corresponding average weight (g) were converted to base log₁₀ to obtain straight line relationship between length and weight. The non linear equation W=aL^brepresenting the length-weight relationship in fishes as proposed, which is the linear equation of the type Y=a+bX, where Y=logW, ‘a’ and ‘b’ are constants and X=logL. The constants ‘a’ and ‘b’ were estimated by least square method. The regression coefficient (b) and correlation (r) were determined by a programme scientific calculator. The relative factors were also calculated by using a formula.

Source of Information: Bangladesh J. Fish., Res., 6(2): 159-164, 2002

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The present study indicates an isometric pattern of growth and highly correlated relationship between length and weight of fish.

Knowledge Management: Journal