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Morphometric Relationships of Length-weight and Length-length of Four Cyprinid Small Indigenous Fish Species from the Padma River (nw Bangladesh)

Md. Yeamin Hossain
University of Rajshahi, Faculty of Agriculture, Department of Fisheries, Rajshahi 6205, Bangladesh.

Abstract/ Executive Summary:

This study describes the length-weight (LWR) and length-length (LLR) relationships of four cyprinid important small indigenous fish species (SIS) from the Padma River, Bangladesh. A total of 914 specimens were caught by traditional fishing gear from March 2006 to February 2007. Length (cm) and body weight (g) for each specimen was taken by a digital slide caliper and balance, respectively. The allometric coefficient b was close to isometric value (≈3.000) in Aspidoparia morar and Puntius ticto, although it suggested positive allometric growth in Amblypharyngodon mola and Lepidocephalus guntea. The results further indicated that LLRs were highly correlated (r 2 >0.932; P<0.001).

Keywords: Total length-body weight relationships, SIS, Bangladesh

Location: Padma River, northwestern Bangladesh

Start Date: 00-03-2006

End Date: 00-02-2007

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

The aim of the present paper was to carry out the first complete and comprehensive description of the LWR and LLR of these four species from the Padma River, Bangladesh.

Methodology:

The present study was conducted in the Padma River, northwestern Bangladesh. The lower part of the Ganges (known as Padma River in Bangladesh) entered Bangladesh from India through the Rajshahi district (Latitude 24°22' N; Longitude 88°35' E). The Padma River is believed to be an important spawning and feeding ground for riverine fish species of northwestern Bangladesh. A large number of fishes including some commercially important species are fished by both small and large scale fishers throughout the year. The samples for four small indigenous fish species were collected during daytime on a seasonal basis from the catch landed at the Rajshahi city, Rajshahi, Bangladesh from March 2006 to February 2007. These fishes were caught by means of the traditional fishing gears jhaki jal (cast net), tar jal (square lift net), and dughair (conical trap) (Kibria and Ahmed, 2005). The samples were immediately preserved with ice and fixed with 5% formalin on arrival in the laboratory. For each individual, total length (TL), standard length (SL) and fork length (FL) were measured to the nearest 0.01 cm using digital slide calipers, and whole body weight (BW) was taken on a digital balance with 0.01 g accuracy. The weight-length relationship was calculated using the expression: W= a Lb , where the W is the body weight (g), L the total length (cm), “a” the intercept of the regression and b is the regression coefficient (slope). Parameters a and b of the weight length relationship were estimated by linear regression analysis based on natural logarithms: ln(W) = ln(a) + b ln(L). The determination coefficient (r2 ) was used as an indicator of the quality of the linear regressions (Scherrer, 1984). Additionally, 95% confidence limits of the parameters a and b and the statistical significance level of r2 were estimated. In order to confirm whether b values obtained in the linear regressions were significantly different from the isometric value of ±95% (α = 0.05) was applied, expressed by the equation according to Sokal and Rohlf (1987): ts = (b-3) / sb, where ts is the t-test value, b the slope and sb the standard error of the slope (b). All the statistical analyses were considered at significance level of 5% (P<0.05). Results A total of 914 specimens of four small indigenous fish species were collected from the Padma River near Rajshahi city, Bangladesh during the present study. The sample size (n), length range, parameters a and b of the LWR, 95% confidence intervals of a and b, the determination coefficient (r² ), and growth type of these 4 fishes. All relationships were highly significant (P<0.001), with r² values being greater than 0.913. The calculated allometric coefficient b ranged from a minimum of 3.004 for A. morar, to a maximum of 3.758 for A. mola, with an average value of 3.374. The b value of LWRs for A. morar and P. ticto were close to 3 indicating the isometric growth. The LWRs indicated a positive allometric growth in A. mola and L. guntea. Conversion among length measurements, i.e. relationships between TL, FL and SL of 914 small indigenous fish specimens along with the estimated parameters of the length-length relationship and the coefficient of determination r². All LLRs were highly significant (P<0.001), with most of the coefficient of determination values being >0.932.

Source of Information: Turkish Journal of Fisheries and Aquatic Sciences 10: 131-134 (2010) www.trjfas.org ISSN 1303-2712

Article Link (Online Journal): DOI: 10.4194/trjfas.2010.0118

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The total length-weight relationship estimates for the threatened ticto barb P. ticto is only available in Fish Base, however, no information currently exists for the reminder three species and therefore, this study may contribute to this invaluable database.

Knowledge Management: Journal