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Some Aspects of Biology of Snake Head Channa Striatus

Shikder Saiful Islam*
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Md. Saifuddin Shah
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Rubia Akter
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Priyanka Biswas
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Wasim Sabbir
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Joyanta Bir
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Abstract/ Executive Summary:

Some biological aspects of Channa striatus viz., length-weight relationship, fecundity and condition factor were observed in the laboratory. Sample of 20 individuals of Channa striatus was collected randomly from local market in the Khulna city. The regression equation was found in case of total length and body weight, W = -416.46 + 23.19T (r2=0.896). The arithmetic regression equation of the relationship between the standard length and weight was, W = -382.05 + 26.0371 S (r2=0.908). The regression equation of the relationship between the total length and fecundity was, F = -16046 + 959.671 T (r2=0.859), standard length and fecundity was estimated as F = -14424 + 1070.25 S (r2=0.865) and body weight and fecundity as F = 3965.43 + 32.9612 W (r2=0.764). Among the different linear relationships, total length and body weight relationship was the strongest. Relationship between condition factor and fecundity was the weakest. The fecundity of the species was ranged from 4939 to 22723 and the mean fecundity of the 20 fishes was 14836.050 ± 4019.9612. Maximum fecundity was found in the fish having total length of 38 cm, body weight 475 g and minimum fecundity was found in the fish having total length of 26 cm, body weight 190 g. Condition factor of Channa striatus was found to vary from 0.68167 to 1.35073 with a standard deviation of 0.1748 and the mean value was 0.979 ± 0.1748.

Keywords: Length-weight relationship, Fecundity, Condition factor, Channa striatus

Location: Local market of Khulna

Start Date: 07-08-2009

End Date: 25-10-2009

Program Area: Animal Health and Management

Commodity: Snake head

Objectives:

The research was conducted to determine the length-weight relationship, fecundity and condition factor of snake head Channa striatus.

Methodology:

Twenty specimens of snake head Channa striatus were collected randomly from local market of Khulna during 7 August to 25 October 2009. After cleaning and washing the specimens total length, standard length was recorded in centimeter (cm) and the weighs were measured by means of a sensitive (3 decimal places) electric balance in gram (g). Before weighing the specimens; the excess moisture was carefully dried off with the help of a blotting paper and dried in the air for some time for taking the accurate weight. Eye observation and common morphological symptoms like swollen abdomen and red color of the anus was used for identifying the maturity stages. Enlarged and Yellowish abdomen of the female specimens could be easily distinguished for gravid stage. The ovaries were dried off by removing excess fluid with the help of blotting paper and then were measured to the nearest g by an electric balance. The two lobes were also measured separately. Randomly selected eggs were measured taking from anterior, middle and posterior parts of each of the lobes.

Length-weight relationship: The length--weight relationship was described by the following formula given by Le Cren (1951).

W = aLⁿ ........................................ (1)

Where `a' is a constant or intercept and 'n' is an exponent or slope. This formula has been followed in the present study. The exponential form of relationship in formula (I) can be expressed in the logarithmic form: Log W = Log a + n Log L ..................... (II)

Estimation of condition factor: The condition factor was calculated by the following formula:

K= W x 10² / L³ (King, 1997)

Where, W = Weight (g), L = Length (cm), K = Condition factor

Fecundity estimation: Gravimetric method was applied in the present study. From the ovary six cross-sectional samples, were removed along with the accompanying membranes from the anterior, central, posterior regions of the lobes of ovaries of each fish. Thus the fecundity was obtained by using the following formula:

F = N x Gonad weight (g) / Sample weight (g)

Where F is the fecundity and N is the number of eggs in the sample.

Source of Information: Khulna University Studies Volume 11 (1&2) and 12(1&2) : December 2013

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The major limitation of the present study was sample size and data that were collected for only three months. So, variation in the value of fecundity during different months could not be observed. Moreover, some of the fish specimens used in the present investigation were not with full of eggs in their ovaries and related environmental parameters were not studied. Therefore, round the year systematic study for at least three consecutive years is recommended in different aqua-ecological regions to arrive at conclusion.

Knowledge Management: Journal