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Length-weight Relationship and Condition Factor of Puntius Stigma from Chanda Beel, Gopalgonj

G. Sarker
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna - 9208, Bangladesh

M.M. Khatun
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna - 9208, Bangladesh

M.N. Ahsan*
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna - 9208, Bangladesh

Abstract/ Executive Summary:

Length–weight relationship is very important for scientific culture and management of fish. The relationship has great biological interest as it helps to determine the mathematical relationship between the two variables and to calculate the variation from the expected weight for length of individual or groups of fishes (Le Cren, 1951). Measurement of fork length relationship is extremely used in the identification of fish up to species level (Hoque and Rahaman, 1985). On the other hand, the condition factor serves as a useful index of the nutritional and biological cycle including gonadal development and spawning of the species (Jhingran, 1972). This has been used to test the suitability of an environment for a particular species by comparing two or more populations of the fish from different localities (Le Cren, 1951). Furthermore, it is also helpful in assesing experimental improvement of an environment for existing and new fish stock (Cooper and Benson, 1951).

Keywords: Length-Weight Relationship, Condition Factor, Puntius stigma, Chanda Beel, Gopalgonj

Location: Chanda Beel, Gopalgonj

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

The length-weight relationship of any species may vary from area to area and can be used to test the suitability of an environment for a particular species by comparing different populations of the same species from different geographic regions. Although Islam and Hossain (1991) studied on length-weight relationship and condition factor of P. stigma found in Rajshahi, the present study was carried out to determine length-weight relationship and condition factor of P. stigma from Chanda beel, one of the famous water bodies situated in Gopalgonj.

Methodology:

Puntius stigma being small in size is widely caught and consumed by the common people. While the fish contains 18.95% protein, 6.27% lipid, 72.97% moisture on a wet weight basis (Nurullah et al., 2003), it is particularly noted for its excellent vitamin and mineral sources: 37±16 µg vitamin A and 1059±161 mg calcium (Wahab, 2003).

A total of 152 fish samples were collected randomly from Chanda beel, Muksudpur, Gopalgonj during the breeding season (August-September) of P. stigma. For the biological studies the length and weight of each specimen was recorded separately to the nearest 0.1 cm and gm, respectively. The excess water attached to the fish was removed with the help of blotting paper before taking body weight (W) by a sensitive electrical balance. The length was measured with the help of a measuring board and steel measuring tape and scale by placing the sample on it. All these materials were brought to the field spot for immediate measurement. Total length (TL) was measured from the anterior most extremity to the longest ray of the caudal fin whereas standard length (SL) was measured from the anterior most extremity to the base of the caudal fin. On the other hand, fork length (FL) of the specimen was measured from the anterior most extremity to the median rays of the tail.

The data were fitted into Le Cren’s (1951) formula W= aLn or logarithmically LogW=Loga + nlogL where W = weight of fish, L = Length (TL/SL/FL) of fish, a = intercept and n = regression co-efficient.

As the total length and fork length measurement might at times be erroneous due to damaging or breaking caudal fin rays, the standard length was chosen to measure the condition factor (K) and relative condition factor (Kn) to avoid inaccuracy in the measurement. The value of K was measured by both observed values and calculated values. Hence, the data of length were arranged in 3 cm interval.

The relative condition factor was also determined by the following formula given by Le Cren (1951):

Relative condition factor (Kn) = Observed body weight in gm / Calculated body weight

The condition factor (K) was calculated with the help of the formula given by Dewan and Doha (1973): K = W. 10² /L³

where, W = weight in gm, L = length in cm

Source of Information: J. Sci. technol. (Dinajpur) Vol. 5: 144-148 (2007) ISSN 1994-0386

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The Kn values ranges from 0.95 to 1.04 in males, 0.89 to 1.06 in females and 0.96 to 1.10 in combined males-females with a mean of 1.00, 0.96 and 1.00, respectively. The variation of the value of K and Kn between present and previous study may be due to geographical variation. The fluctuation of condition factors in different groups may be attributed to spawning and following recovery, gonadal development and also also on the general condition of seasonal apetite (Dewan and Doha, 1973). However, the factors like environment, food and parasitism influence K directly through growth rate. Seasonal fluctuations in feeding activity, gonadal development and growth can also bring changes in the value of K (Le Cren, 1951).

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