Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Relationships Between Body Size, Weight, Condition and Fecundity of the Threatened Fish Puntius Ticto (hamilton, 1822) in the Ganges River, Northwestern Bangladesh

Md. Mosaddequr Rahman
Department of Fisheries Faculty of agriculture university of Rajshahi Rajshahi 6205Bangladesh

Elgorban M. Abdallah
Center of excellence of Biotechnology Research King Saud university Riyadh 11451 Saudi Arabia

Abstract/ Executive Summary:

The ticto barb Puntius ticto (Hamilton1822) is a small, indigenous fish species of Bangladesh that is widely distributed in the natural waters of Asian countries. This study describes the relationships between body size, weight, condition (Fulton’s, KF; allometric, KA, KR; and relative weight, WR) and fecundity of the threatened species P. ticto from the Ganges River, northwestern Bangladesh. A total of 24 mature female specimens were collected by the traditional fishing gears from March to August 2006. For each individual, total (TL), fork (FL), standard length (SL), and ovary length (OL) were measured by digital slide calipers, while the body (BW) and ovary weight (OW) were taken by a digital balance. The total fecundity (FT) of each female was calculated as the number of eggs found in each ovary, whereas relative fecundity (FR) was the number of eggs per gram of fish weight. The results showed that TL of P. ticto varied from 9.10 to 10.80 cm, with calculated mean ± SD as 9.77±0.57 cm. Body weights extended from 14.00 to 24.00 g, with calculated mean ± SDas 17.83±3.39 g. The mean FT was 2586±700 and ranged from 1611 to 4130. BW was more significantly correlated with total fecundity (r2>0.633; p<0.001) than various other body metrics. The results also indicated significant correlation between length-weight (df=22, t-test≥8.86, p<0.001); FT -KF (rs=0.473; p=0.019), FT-KA (rs=0.502; p=0.012), and FT-WR (rs=0.483; p=0.016), but insignificant correlations were found between FT-GSI (rs=0.309; p=0.141) and FR-with various other body metrics. The knowledge of fecundity would be useful to impose adequate regulations for the conservation of this threatened species in the Ganges River and nearby areas of Bangladesh.

Keywords: Bangladesh; fecundity; Ganges River; Puntius ticto

Location: Ganges River, Northwestern Bangladesh

Start Date:

End Date:

Program Area: Socio-economic and Policy

Commodity: Fish

Objectives:

The present study enhances our knowledge on the relationships between body size, weight, condition, and fecundity of female P. ticto from the lower Ganges River of northwestern Bangladesh.

Methodology:

The lower Ganges (known as the Padma River in Bangladesh) entered Bangladesh from India through the Rajshahi district (24° 22’ N; 88° 35’ E). A large number of fish species, including some commercially important species, are fished by both small- and large-scale fishermen throughout the year (Hossain et al. 2009b). The samples for P. ticto were collected during the daytime from the fishermen’s catch landed at Rajshahi city ((Jhaj ghat, Binodpur), Rajshahi, Bangladesh from March to August 2006. The fish was caught by means of the traditional fishing gears jhaki jal (cast net), tar jal (square lift net), and dughair (conical trap) (Kibria & ahmed 2005). The samples were immediately preserved with ice and fixed with 5% formalin solution upon arrival in the laboratory. all specimens were sexed by gonad observation under a binocular microscope to identify the mature females for this study. For each individual, morphometrics was assessed. Total length (TL), fork length (FL), and standard lengths (SL) were measured to the nearest 0.01 cm using digital slide calipers (Mitutoyo, Cd-15PS). Whole-body weight (BW) was taken on a digital balance (Shimadzu, eB-430dW) with 0.01 g accuracy. The whole ovary was removed from each female fish. Each ovary length (oL) and weight (oW) was measured to the nearest 0.01 cm and to the nearest 0.001 g, respectively. The gonadosomatic index (GSI) was estimated by the equation, GSI (%) = (oW/BW) × 100. The length-weight relationship (LWR) was calculated using the expression: W= aLb, where the W is the BW or gonad free bodyweight (BW-GW) in g and L is the TL, FL, or SL in cm. Parameters a and b were estimated by linear regression analysis based on natural logarithms: ln(W) = ln(a) + b ln(L). Additionally, 95% confidence limits of b and the coefficient of determination r2 were estimated. To confirm whether b values obtained in the linear regressions were significantly different (α = 0.05) from the isometric value of 3.0, this equation according to Sokal & Rohlf (1981) was applied: ts = (b-3) / sb, where ts is the two-tailed t-test value, b the slope, and sb the standard error of the slope (b). The comparison between ts and the respective critical table values allowed me to determine whether b values were in the isometric (b=3) or allometric range (negative allometric as b<3 or positive allometric as b>3) (Tesch 1971; Somers 1991). Fulton’s condition factor (KF) and allometric condition factor (Ka) were calculated using the equations given by Htun-Han (1978) as KF =100× (W/L3), and Ricker (1975) as KA = W/Lb, respectively, where W is the body weight (BW) in g; L is the total length (TL) in cm, b is the parameters of the TL-BW relationship. According to Froese (2006), factor 100 is used to bring KF close to unity. In addition, relative weight (WR) was calculated by the equation given by Rypel and Richter (2008) as WR = (W / WS) × 100, where W is the weight of a particular individual and WS is the predicted standard weight for the same individual as calculated by WS= aLb (a and b values obtained from the relationships between TL and BW). Statistical analyses were performed using Microsoft® excel-add-in-ddXL, GraphPad Prism 5and VassarStats software. all data were checked for homogeneity of variance. Tests for normality of each group were (1) conducted by visual assessment of histograms and box plots and (2) confirmed with the Kolmogorov-Smirnov test and Shapiro-Wilk test. Where test for normality assumption was not met, then the non-parametric Wilcoxon signed-rank test was used to compare the mean relative weight of this population with 100 (Anderson & Neumann, 1996), whereas Spearman rank test was used to check fecundity and condition-factors correlations. The LWRs between TL vs. BW and TL vs. BW-oW were compared by ANOVA (analysis of covariance). all statistical analyses were considered significant at 5% (p<0.05).

Source of Information: Sains Malaysiana 41(7)(2012): 803–814

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In conclusion, this study has provided some basic information on the size, weight, condition, and fecundity for P. ticto that will be helpful in similar studies. as no information on these biological aspects currently exists in Fish Base, the present results may contribute to this invaluable database. Further, it would be useful for fishery biologists and managers to impose adequate regulations for sustainable fishery management in the Ganges River and nearby areas of Bangladesh.

Knowledge Management: Journal