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Length-weight and Morphometric Relationships of the Tank Goby Glossogobius Giuris (hamilton, 1822) (perciformes: Gobiidae) in the Ganges of Northwestern Bangladesh

M.Y. HOSSAIN
United Graduate School of Agricultural Sciences, Faculty of Fisheries Kagoshima University, 1-21-24 Korimoto, Kagoshima 890-0065, Japan

J. OHTOMI
Faculty of Fisheries, Kagoshima University 4-50-20 Shimoarata, Kagoshima 890-0056, Japan

Z.F. AHMED
Department of Fisheries Management, Faculty of Fisheries Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

A.H.M. IBRAHIM
Department of Fisheries, Faculty of Agriculture University of Rajshahi, Rajshahi 6205, Bangladesh

S. JASMINE
Department of Fisheries, Faculty of Agriculture University of Rajshahi, Rajshahi 6205, Bangladesh

Abstract/ Executive Summary:

The present study describes the length-weight (LWR) and morphometric relationships of the tank goby Glossogobius giuris (Hamilton, 1822) (Perciformes: Gobiidae), an important small indigenous fish species in the Ganges, northwestern Bangladesh. A total of 266 specimens, 11.30-23.60 cm in total length (TL), were caught using traditional fishing gear from March 2006 to February 2007. The allometric coefficient b of the LWR for the combined sexes was close to the isometric value (b = 3.068 for TL and b = 3.089 for SL, standard length), but with a slight negative allometric growth for males (b = 2.954 for TL, b = 2.953 for SL) and a slight positive allometric growth for females (b = 3.293 for TL, b = 3.166 for SL). The results further indicated that morphometric relationships were highly correlated (r2> 0.712; P < 0.001). To the best of our knowledge, this study presented the first reference on LWR and morphometric relationships for G. giuris from Bangladeshi waters. These results will be useful for fishery managers to impose adequate regulations for sustainable G. giuris fishery management not only in the Ganges of Bangladesh but also in neighbouring countries.

Keywords: Length-Weight, Morphometric Relationships, Tank Goby, Ganges, Bangladesh

Location: Ganges of Northwestern Bangladesh

Start Date:

End Date:

Program Area: Variety and Species

Commodity: Fish

Objectives:

The aim of the present paper was to carry out the first complete and comprehensive description of the LWR and morphometric relationships of G. giuris from the Ganges, Bangladesh.

Methodology:

The present study was conducted in the lower part of the Ganges, northwestern Bangladesh. The Ganges (known as Padma River in Bangladesh) enters Bangladesh from India through the Rajshahi district (Latitude 24° 22' N; Longitude 88° 35' E). A number of commercially important fish species including G. giuris are fished by small scale fishermen throughout the year. The samples for G. giuris were collected during the daytime on a seasonal basis from the fisherman catch landed at the Rajshahi city, Rajshahi, Bangladesh from March 2006 to February 2007. The fishes were caught by means of the traditional fishing gears jhaki jal (cast net), and dughair (conical trap) (Kibria and Ahmed 2005). The fresh fish samples were immediately placed in ice and were fixed in 2% formaldehyde solution upon arrival in the laboratory. The fixed specimens were taken out one by one later to be weighed, measured and sexed. For each individual, total length (TL) standard length (SL), head length (HL), snout length (SnL), body depth (BD), caudal length (CL), caudal peduncle depth (CPD), pre-dorsal length (PrDL), post-dorsal length (PoDL), anus length (AnL), and anal length (AL) were measured to the nearest 0.01 cm using digital slide calipers, and whole-body weight (BW) was taken on an electric balance with 0.01 g accuracy. The weight-length relationship was calculated using the expression:W= aL^b

where W is the body weight (g), L the total length (cm) or the standard length (cm), an 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). Additionally, 95% confidence limits of the parameters a and b and the statistical significance level of r2 were estimated. The determination coefficient (r2) was used as an indicator of the quality of the linear regressions (Scherrer 1984). 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)/s_b

where ts is the t-test value, b the slope and sb the standard error of the slope (b). The comparison between obtained values of t-test and the respective tabled critical values allowed for the determination of the b values are statistically significant, and their inclusion in the isometric range (b=3) or allometric range (negative allometric; b<3 or positive allometric; b>3). Further, the morphometric relationships were made through linear regressions.

Source of Information: Asian Fisheries Science22 (2009):961-969

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

This study presents basic information on LWRs and morphometric relationships for the tank goby G. giuris that would be useful for fishery managers as well as the sustainable management of its numerous stocks in the region. Moreover, the length-weight relationship estimates for this fish G. giuris are only available in Fish Base, however, no information on morphometric relationships currently exists and therefore, our results may contribute to this invaluable database. More detailed studies are suggested to provide further specific information on the seasonal variation of LWRs, condition factor and gonadosomatic index of the tank goby in the Ganges.

Knowledge Management: Journal