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Length-weight Relationship and Condition Factor of Climbing Perch (anabas Testudineus, Bloch)

Mustafizur Rahman
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Abstract/ Executive Summary:

Length-weight relationship, condition factor and relative condition factor of climbing perch (Anabas testudineus, Bloch) were studied over a period of eleven months from April 2007 to February 2008. A total of 297 fish samples were collected from Khulna and Bagerhat districts. The length-weight relationship of A. testudineus was linear and the equations for total length-body weight and standard length-body weight were BW = −35.77 + 5.65×TL (r2=0.94) and BW = −31.56 + 6.52× SL (r2=0.94), respectively. The coefficient of correlation indicates that the relationship between length and weight of the fish was highly significant. The maximum and the minimum values of the condition factor were 24.594 (body weight 26.1 g) and 17.809 (body weight 18.9 g), respectively with the mean value of 20.522±1.248. The relative condition factor varied from 0.883 (body weight 12.7 g) to 1.225 (body weight 26.1g) with the mean value of 1.014±0.061.

Keywords: Length-weight relationship, Condition factor, Climbing perch, Anabas testudineus

Location: Khulna and Bagerhat districts.

Start Date: 00-04-2007

End Date: 00-02-2008

Program Area: Animal Health and Management

Commodity: Koi/Climbing

Objectives:

Among the various biological aspects of fish, the length-weight relationship is important in fishery management, culture regulations and also ascertaining the environmental suitability of a particular fish in a particular area (Quddus and Dewan, 1988). Application of length-weight relationship includes the estimation of the standing stock biomass, calculating condition indices and comparing the ontogeny of fish populations from different regions.

Methodology:

Fortnightly samples of A. testudineus were collected during the period April 2007- February 2008 from Khulna and Bagerhat districts. A total of 297 specimens were collected using cast net and drag net from ghers and beels. On each sampling day 10 to 15 fish were randomly collected. The specimens were brought to the fish biology laboratory of Fisheries and Marine Resource Technology Discipline, Khulna University in fresh condition and preserved in a freeze at -18^o C.

Total length (TL) of each fish was measured from the anterior most tip of the snout to the posterior most tip of the caudal fin on a meter scale to the nearest cm. Standard length (SL) was also measured from the anterior most tip of the snout to the base of the caudal fin on the same scale. Body weight (BW) was taken by an AND electronic balance with 0.1 g accuracy. Before taking weight excess water from the fish body was blotted dry.

The length-weight relationship was calculated by using Le Cren’s (1951) formula as follows:

W = aL^b

Where, W = weight in g; L = length in cm; a = intercept and b = exponent

The exponential form of the relationship in the formula was expressed in logarithmic form as follows:

logW = log a + b log L

The values of a and b in the equation were calculated by using the following mathematical relationship given by Doha and Dewan (1967), Lagler (1956) and Rounsefell and Everhart (1953).

Source of Information: Khulna University Studies, 9(2): 211-214, 2008

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results obtained with present study agree well with the results reported for Tenualosa ilisha (Haldar and Amin, 2005), for Pampus argenteus and for Catla catla. The logarithmic transformation of the SL-BW relationship was also positive and linear.

The K observed in the present study ranged from 17.809 to 24.594 with a mean value of 20.5±1.248. The highest value of the condition factor was observed in the smaller length classes. The variation might be associated with the smaller sample size or different stages of maturity or spawning variation or due to the weight of food contents in the stomach. Similar fluctuating trends of the condition factor were also reported in case of other fishes by Islam et al. (1999), Karim et al. (1988) and Mia (1984). The values of Kn were not stable to certain length classes. The highest Kn values were observed in the middle length classes which gradually decreased from left to right with the increase in length.

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