Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Length-weight Relationship and Condition Factor of Black Carp (mylopharyngodon Spiceus Richardson) in Bangladesh

M.S. Islam
Brackishwater Station, BFRI, Khulna 9280, Bangladesh

M.A. Quddus
Dept. of Agricultural Statistics, BAU, Mymensingh

M.S. Shah
Khulna University, Khulna

M.A. Mazid
Bangladesh Fisheries Research Institute, Mymensingh 2200 Bangladesh

Abstract/ Executive Summary:

The length-weight relationship and condition factor of Mylopharyngodon species were determined. The result of the study showed the dependence of weight (W) on the total length (L) in the following form: W = 0.006L^3.156 or in the logarithmic form Log W =- 2.1851 + 3.156 Log L. Standard errors of length and weight were 0.674 cm and 3.214 g respectively. The co-efficient correlation "r" was found to be 0.972 which indicated that the relationship between length and body weight of the fish was highly significant. The t - test also indicated that the correlation between length and weight was significant. The range and mean value of condition factor (K) were 0.865 to 1.041 and 0.958 respectively.

Keywords: Length-weight relationship, Condition factor, Black carp

Location: Brackishwater Station, BFRI, Khulna 9280, Bangladesh

Start Date: 00-00-1995

End Date: 00-00-1995

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To know the length-weight relationship of black carp.

Methodology:

The samples were randomly collected from the selected ponds with the help of seine net at seven and fifteen days intervals. A total of 61 fishes were taken for the study. The total length of each fish was measured from the anteriorly projecting part of the head to the farthest tip of the caudal fin. The length was recorded in em and weight in g. The length-weight relationship was determined by the equation of W = aLn ------------ (1) where, W=weight, L=length, a=constant and n=exponential value. The value of n and a were calculated using the log-log relation in the formula: Log W =Log a+ nLog L --- (2) The value of n will be exactly 3.0 when growth is isometric in the length weight relationship of fish. But the value of n in fish usually lies between 2.5 to 4.0 . The value of Log a and n in formula (2) were calculated by using the following mathematical relationship: l:LogW. LogL- N LogW. LogL n = -------(3) L(LogL) -N (LogL) and Loga = LogW - nLogL ---- ( 4) where W = weight in grams, L = length in em and N = sample size. The co-efficient of correlation "r" was calculated with formula : (Lxl:y) Lxy- N r = ------------- (5) 2 (Lx/ 2(Ly)2 [ {Lx - ----- } {Ly - ----- } ] N N The standard error for regression of y on x and vice versa was calculated by the formulae : Sx = 8xDJ------------ (6) sy = 8yv(1- /) ---------------- (7) t - test was done by the formula : r~(N- 2) t =-----------with d. f.------------ (8) ~(1- /) The condition factor, K was calculated for determining the condition of fish such as the degree of well being. The values of K were determined with the help of the formula : 104 W.102 K = ----- e Length-weight relationship of M. spices where, W = weight in gram, L = length in em and K is the factor of proportion represented the length-weight relationship. The values of n and Log a obtained were 3.156 and -2.1851, respectively. Therefore, the logarithmic form of the equation for the total length and body weight relationship is Log W = -2.1851 + 3.156Log L. The value of n obtained in this experiment was above 3 which indicated that the growth of Mylopharyngodon spices was allometric and weight increased at a rate higher than the cube of their growth.

Source of Information: Bangladesh J. Fish. Res., 3(1):103-106, 1999

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The result of the study showed the dependence of weight (W) on the total length (L) in the following form: W = O.Oo6e.156 or in the logarithmic form Log W =- 2.1851 + 3.156 Log L. Standard errors of length and weight were 0.674 em and 3.214 g respectively.

Knowledge Management: Journal