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Length-weight Relationship and Growth Condition of Mystus Gulio (ham.) in Different Months and Sexes

M. Begum
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacaha, Khulna, Bangladesh

H.K. Pal
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacaha, Khulna, Bangladesh

M.A. Islam
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacaha, Khulna, Bangladesh

M.J. Alam
Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacaha, Khulna, Bangladesh

Abstract/ Executive Summary:

Correlation coefficient (r) between length and weight of M. gulio from December, 2005 to November, 2006 lies between 0.8290~0.9662, regardless the sex and season, representing strong relationship between length and weight i.e. the increase in weight is significant with per unit increase in length.

Keywords: Length-weight relationship, growth condition, Mystus gulio

Location: Bangladesh Fisheries Research Institute, Brackishwater Station, Paikgacaha, Khulna, Bangladesh

Start Date: 00-12-2005

End Date: 00-11-2006

Program Area: Animal Health and Management

Commodity: Cat fish

Objectives:

The present work was undertaken as a part of a study of the catfish, especially to observe seasonal effect on both male and female.

Methodology:

Live specimens of M. gulio for this study were collected from the fish market in Paikgacha upazilla where it comes from the adjacent rivers, swamps and shrimp farms. The study is based on the monthly examination of 100 specimens of each sex in the size range of 10.0-29.2 cm collected during the period of December, 2005 to November, 2006. The specimens were brought alive to laboratory. In the laboratory fishes were sexed and sorted according to their stage of maturity. The total lengths of fish were recorded to the nearest millimeter from the tip of the snout to the tip of the tail. Weights of the fish were recorded to the nearest gram using digital weighing device (Tanita, KD-160) sensitive to 1g. After the measurement of specimens, the fishes were preserved in 10% formalin as quickly as possible. The length-weight relationship was determined by following the standard methods and condition factor (K) was calculated. The relationship of length and weight was used to calculate the regression coefficient n (slope of regression line of weight on length): W = aLn or Log W = Log a+n Log L ------------- (1) Where W=Weight, L=Total length and a= intercept. The equation (1) may be written in short notation i.e. W′ = a′+nL′ Where W′ = Log W, L′ = Log L and a′ = Log a The length weight relationship was calculated separately for males and females during different seasons to observe if there are differences in the relationship due to sex and season. In all the cases, the relationship was found to be linear in the logarithmic form conforming to the general formula expressing the relationship between the length and weight of fishes.

Source of Information: Univ. j. zool. Rajshahi. Univ. Vol. 28, 2010 pp. 73-75; ISSN 1023-6104

Article Link (Online Journal): http://journals.sfu.ca/bd/index.php/UJZRU

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Condition (K) value increased proportionately with the length of the fish. The first peak in condition factor (K) and relative condition factor (Kn) was recorded at the size interval of 18~20 cm followed by the second prominent peak at the size group 22~24 cm. The first peak indicated the condition of sexual maturing stage, which generally showed the fast growth rate, whereas the second peak coincided with the size at its breeding maturity.

Knowledge Management: Journal