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Morphometric Study of Banded Gourami (colisa Fasciata) in Jessore, Bangladesh

Sharmin Akter
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh.

Md. Farid Uz Zaman
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, 2202, Bangladesh

Md. Hasan-Uj-Jaman
Departments of Fisheries and Marine Bioscience, Faculty of Applied Biological Science and Technology, Jessore 7408, Bangladesh.

Iren Nahar Sithi
Department of Aquaculture, Faculty of Fisheries and Marine Resource Technology, Khulna University, Bangladesh

Dilruba Yesmin
Department of Coastal and Marine Science, Faculty of Fisheries and Marine Resource Technology, Khulna University, Bangladesh.

Abdulla-Al-Asif
Department of Aquaculture, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh.

Abstract/ Executive Summary:

Population morphometry including population demography, size group distribution, length weight relationship and sex ratio of an important freshwater fish, Colisafasciata was studied which collected from Jessore and Jhenaidah districts in Bangladesh during May, 2014 to April, 2015. Random samples of 201 individuals (108 males and 93 females) were collected from different fish markets in Jessore (Monirampur, Borobazar, Chowgasa) and Jhenaidah (Mohespur, Barobazar, Kotchandpur) district. The mean size of the specimen was recorded 65.08 ±14.32 mm in length and 7.43 ±3.09 g in body weight. Females were found little smaller than males. The specimens were larger in winter than summer and monsoon season. But in monsoon season the females were larger than males. The maximum length of the specimen collected from Jhenaidah district was smaller compare to the specimen of Jessore district. Most of the population (29%) was observed under 55-64 mm size class. Linear relationship was obtained between the log length (mm) and log weight (g) of the species in respects of sexes, seasons, and districts. The allometric coefficient ‘b’ of the relationship indicated negative allometric growth of the species as ‘b’ value was less than 3. The overall sex ratio (male: female=1:0.86) showed significant difference from the expected value 1:1. Overall males showed non-significant over females (χ²=1.119) in all season of both districts but in November males showed the significant (P<0.01) dominance over females. However, the findings of the present study have helped us to understand more about the species is the prerequisites in fishery management strategy and culture system.

Keywords: Morphometric study; Banded gourami; Fishery management strategy, Culture system

Location: Department of Fisheries and Marine Bioscience, Jessore University of Science and Technology, Jessore

Start Date: 00-05-2014

End Date: 00-04-2015

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

To study the population demography, size group distribution, length weight relationship and sex ratio in order to have baseline information which may helpful to manage and conserve of C. fasciata.

Methodology:

Khoilsa were collected randomly from six stations namely Monirampur (A1), Borobazar (A2), Chowgasa (A3) of Jessore district and Mohespur (B1), Barobazar (B2), Kotchandpur (B3) of Jhenaidah district. Samples were collected for a period of one year (May, 2014 to April, 2015) in each month of each station. Samples were taken from fish market and preserved in 10% formalin and brought back to laboratory of the department of Fisheries and Marine Bioscience, Jessore University of Science and Technology, Jessore for mormophometric measurements. The total length and standard length of the fish specimens was measured in mm by using slide calipers. After blotting off the excess water from their body, total body weight of the fish was taken by an electric balance in gm (A & D company, Model: EK 1200i; Made in Japan). A total of 201 specimens, ranging from 25 to 91.8 mm were randomly collected from the local fish markets of Jessore and Jhenidah district. The fishes were arranged into seven size group having 10 mm total length interval. Size frequency histogram was obtained by plotting frequency in percentage against different total length of both males and females of the two districts in different season. Linear correlation coefficient, measures the strength and the direction of a linear relationship between two variables. The determined coefficient (r²) was used as an indicator of the quality of the linear regressions. Sexes were separated by external morphology: the upper lip of the male is more pronounced and the dorsal ventral fins are more pointed at the posterior while those of the females are rounded. Then the fishes were dissected and confirm the sex by observing the gonads. In other hand, males are more colorful and longer than females. Females are pale gray or silvery color. After identifying the sex of 201 specimens? sex ratio was analyzed by Chi-square (χ²) The observed ratio was tested against an expected ratio that is for the difference from the hypothetical ratio 1:1 by the method of F test. Male-female distribution of the fish was observed for different months and season. The formula used for calculating male-female distribution. The obtained data from the experiment was analyzed by using the software Microsoft excel 2007 and presented in tabular and graphical forms.

Source of Information: Asian J. Med. Biol. Res. 2016, 2 (1), 113-120; ISSN 2411-4472 (Print) 2412-5571 (Online)

Article Link (Online Journal): doi: 10.3329/ajmbr.v2i1.27576

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Colisa fasciata has gained importance for its food and ornamental value. The maximum and minimum length of the species was 98.1 and 25 mm, respectively. Females were little smaller than males. The maximum length of the specimen collected from Jhenaidah district was little smaller compare to Jessore district. The sampled male species was mostly belonging to the size class 65-74 mm and the female species mostly belong to the 55-64 mm size class. The relationship between log length (mm) and log weight (g) was found to be linear. The relation also showed negative allometric growth as the 'b' value was less than 3. Sex ratio was in favor of males (male: female =1:0.86). Overall males showed non-significant over females (χ² test). The findings of this study will provide valuable information to the fisheries biologist and fisheries management authorities.

Knowledge Management: Journal