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Morphometric Characters and Sex Ratio of the Freshwater Garfish, Xenentodon Cancila Collected from Different Waters of Jashore, South-western Bangladesh

MS Islam
Department of Fisheries and Marine Bioscience, Jashore University of Science and Technology, Bangladesh

P Laboni
Department of Fisheries and Marine Bioscience, Jashore University of Science and Technology, Bangladesh

Abstract/ Executive Summary:

The freshwater garfish, Xenentodon cancila is one of the important food fish in Bangladesh. The size class distribution, length-weight relationships, and sex ratio of X. cancila are described in the present study. A total of 138 specimens were collected randomly for a year from the local fish markets and/or direct from fishermen who fish primarily in nearby waters (Beel, Canal, and Baor) of Jashore, southwestern Bangladesh. Most individuals were collected in the rainy season and their mean size was larger compared to the other two seasons (summer and winter). The maximum size recorded was 254.1 mm total length (TL) and 38.05 g body weight (BW). The mean TL and BW were 166.35±38.17 mm and 11.16±7.47g, respectively. Most of the individuals belonged to the size class of 141-180 mm. The length-weight relationship (LWR) was strongly correlated as the regression value was 0.876 and the relationships were linear in both sexes. The allometric coefficient ‘b’ of the LWR indicated nearly positive allometric growth and the value was 2.98. The male fishes were dominant over females and the ratio was 1: 0.77. These research outcomes would be useful for the researcher to better understand the biological aspects of freshwater garfish in the nearby waters of the Jashore area in southwestern Bangladesh.

Keywords: Morphometric characters, Length-weight relationship, Sex ratio, Size-class distribution, Xenentodon cancila

Location: Fisheries and Marine Bioscience department of Jashore University of Science and Technology

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Aquatic animal, Fish

Objectives:

To find the samples' demography, sex ratio, size-class distribution, and length-weight relationship of X. cancila caught from the different minor water systems such as canals, beels, and baors in the Jashore area, south-western Bangladesh.

Methodology:

The fish were collected from the local fish markets and/or directly from fish collectors whenever possible for a year. However, it was always taken best care to make sure that the fishes were harvested from the nearby water habitats. The survey was conducted in the local markets namely Borobazar, Palbari, Saluya, Ambottola, Monirampur in each month where fishes gather mostly from the waters of the baor (Jhapa baor), beels (Vabadah, Noyali), and canals (Shagda and Bakura). It is noted that the fish is not available in the locality year-round and was not possible to separate the samples from a single habitat. Thus, in the present study, the collected fishes are considered as the common fish of the minor water habitats as the fish is predominant in the river system. The sampled fishes were preserved in 10% formalin solution and brought to the laboratory of the Fisheries and Marine Bioscience department of Jashore University of Science and Technology for further investigation. In the laboratory, each fish was measured for the total length (TL), and body weight (BW) to the nearest mm and gram by using a slide caliper respectively. The individuals were classified into different size classes according to their length intervals. To know the demographic status of the fish, samples were analyzed with Microsoft Excel to calculate the mean size and weight, maximum-minimum size, and weight of the male, female, and combined sexes. The data also analyzed on a seasonal basis (winter, summer, and rainy) to better understand the life traits of the fish. The length-weight relationships of the collected specimens were estimated by the allometric formula, W Where, “W” is dependent variables (i.e., total body weight in g) and “L” is independent variables (i.e., total length in mm), “a” is the intercept of the regression, and “b” is the regression coefficient (slope). Parameters “a” and “b” of the length-weight relationship were estimated by linear regression analysis based on natural logarithms: Ln (W) = Ln + Lln; Statistical significance of b value determined by isometric range (b = 3) or allometric range (negative allometric; b<3 or positive allometric; b>3). The gonad of the specimens was dissected and observed to identify the sexes. Then sex ratio was calculated monthly and the number of both sexes was plotted against months and seasons in percentage. A Chi-square test was done to find out the sex ratio for the difference, if any, from hypothetical ratio 1:1.

Source of Information: J. Bio-Sci. 29(1): 23-31, 2021 (June)

Article Link (Online Journal): DOI: https://doi.org/10.3329/jbs.v29i0.54819

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The basic information on morphometric characteristics, size-class distributions, length-weight relationships, and sex ratio of the present study would be useful to understand the population status of X. cancila in the different minor habitats of the fish in south-western Bangladesh and nearby such eco-system. It is also suggested to conduct details of the biological study of the fish from each different habitat in the region.

Knowledge Management: Journal