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Size Structure of Fine Scalerazorbelly Minnow, Salmostoma Phulo(cyprinidae) Inhabiting a Coastal River of Bangladesh

Chaklader M.R.*
Department of Fisheries Biology and Genetics, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Siddik M.A.B.
Department of Fisheries Biology and Genetics, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Hanif M.A.
Department of Fisheries Biology and Genetics, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Nahar A.
Department of Marine Fisheries and Oceanography, Patuakhali Science and Technology University, Patuakhali-8602, Bangladesh

Abstract/ Executive Summary:

The aim of this study was to report the size structure of fine-scale razor belly minnow, Salmostoma phulo in the Payra River, Southern Bangladesh, based on length-frequency distribution (LFD), sex ratio (SR), length-weight relationships (LWR), length-length relationships (LLR), condition factors (allometric KA; Fulton’s, KF; relative, KR and relative weight, WR) and form factor (a 3.0). A total of 306 individuals ranging from 6.00–10.70 cm in total length and from 1.26-9.20 g in body weight were collected using traditional fishing gear from January 2014 to November 2014. The overall sex ratio of the species did not reveal significant variation from the expected value of 1:1 (χ2=0.32, p<0.05). The allometric coefficient is calculated for the LWR based on various dimensions indicates both sexes grew allometrically (negative for males: b<3 and positive for females: b>3). Moreover, the values of b for LWR, LLR and condition factors did not differ significantly (p>0.05) between the sexes of S. phulo. The estimated value of WRwas very close to 100 indicating the balanced habitat with available food relative to the presence of predators. To the best of our knowledge, this is the first inclusive and comprehensive explanation of the size structure of S. phulo from Bangladesh and it should be crucial for the sustainable management of this SIS fishery not only in the southern coastal waters of Bangladesh but also in all of its geographical distributions including India and Myanmar.

Keywords: Length-frequency distribution, Length-weight, Condition factors, Allometric growth, Small indigenous species (SIS)

Location: Bangladesh

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

This study presents the first reference of size structure including length-frequency distribution (LFD), sex ratio (SR), length-weight relationship (LWR) and length-length relationships (LLR), condition factors (allometric, KA; Fulton’s, KF; relative, KR and relative weight, WR) and form factor (a3.0) of S. phuloin the Payra River, Southern Bangladesh.

Methodology:

Sample collection: The sample collection was conducted between January and November 2014 from eight stations of the Payra River by commercial fishers who used traditional fishing gear and seine nets to catch the fish. The collected fresh samples were preserved with ice on-site and fixed with 10% buffered formalin to save the species from spoilage or any damage upon arrival at the laboratory. All morphometric characters were measured by following Froese (2006) method. Total length (TL), fork length (FL), and standard length (SL) were measured with the help of using digital slide calipers nearest to 0.01cm and weight was measured with the help of using an electronic balance (Shimadzu, EB-430DW; Shimadzu Seisakusho, Tokyo, Japan) with 0.01 g accuracy. Length-length relationships: The length-length relationship i.e. (i) TL=p+q×SL, (ii) FL=p+q×TL and (iii) SL=p+q×FL were determined by the method of least squares to fit a simple linear regression model as Y=a+bX, where Y=various body lengths, X=total length, a =proportionality constant and b= regression coefficient. Length-weight relationships: Length-weight relationship was calculated based on the exponential equation by Le Cren (1951) as W=a Lb where, where W is the body weight (g) and L is the total length (cm) or fork length (cm) or standard length (cm), ais a coefficient related to body form and bis an exponent indicating isometric growth when equal to 3 and indicating allometric growth when significantly different from 3 (Simon and Mazlan, 2008). The parameters a and b were estimated by linear regression analysis using a log-transformed equation expressed as log W= log a + b log L. The values of the constants a and b of the linear regression were determined by following Rounsefell and Everhart (1953)and Lagler (1966 ). Condition factors: A number of condition factors such as Fulton’s (Fulton, 1904), relative (Le Cren, 1951), allometric (Tesch, 1971), and relative weight (Froese,2006) is used to determine the overall health and productivity of freshwater fish populations (Rypel and Richter, 2008; Muchlisin et al., 2010). The Fulton’s condition factor KF was calculated using the equation given by (Fulton,1904)as KF=100× (W/L3), where Wis the body weight (BW), and L is the total length (TL). The relative condition factor (KR) for each individual was calculated using the equation KR=W/a×Lb (Le Cren,1951), where Wis the BW, Lis the TL and a and b are the LWR parameters. Also, the allometric condition factor (KA) was calculated by using a formula developed by (Tesch,1971)KA= W/Lb, where W is the BW, L is the TL and b is the LWR parameter. Furthermore, relative weight (WR) was determined by using a formula given by Froese (2006)as WR=(W/Ws)×100, where Wis the bodyweight of a particular individual and Ws is the predicted standard bodyweight for the same individual as calculated by WS= aLb(a and b values obtained from the composite of LWRs). Form factor: Based on Froese (2006), the form factor (a3.0) for S. phulo was estimated by using the equation as: a3.0= 10 logs a –s (b-3), where a and b are regression parameters of LWRs, and S= -1.358 is the regression slope of log a vs b. Statistics analyses A χ2 goodness-of-fit test was used to assess the sex-ratio divergence from the expected value of 1:1 (male: female). An analysis of covariance (ANCOVA) was used to compare the relative condition factor between males and females within the same population.

Source of Information: Iranian Journal of Fisheries Sciences 15(4)1348-1361

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

In conclusion, the present study provided the basic information on some biological aspects including length-frequency distributions, sex ratio, length-weight and length-length relationships based on various body dimensions, condition factor, and relative weight for S. phulo from Payra River, southern Bangladesh, which would be effective for fishery biologists, managers and conservationists to implement adequate regulations for sustainable fishery management and conservation of the species. Furthermore, no length-weight and length-length data and condition factors currently exist in the Fish Base for this species, so our results may contribute to this invaluable electric database.

Knowledge Management: Journal