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Sex Ratio, Length-weight Relationships and Seasonal Variations in Condition Factor of Menoda Catfish Hemibagrus Menoda (hamilton, 1822) of the Kangsha River in Bangladesh

Ibrahim Shehu Jega
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

Md. Idris Miah
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

Mohammad Mahfujul Haque
Department of Aquaculture, Bangladesh Agricultural University, Mymensingh, Bangladesh

Md. Shahjahan
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

Zoarder Faruque Ahmed
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

Mst. Kaniz Fatema
Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, Bangladesh

Abstract/ Executive Summary:

Assessment of fish stock assists fisheries managers in taking decisions toward sustainable fisheries. The study was conducted to find out the sex ratio, growth pattern and state of physical well being of Hemibagrus menoda in the Kangsha River Netrakona, Bangladesh. Report on the aspects of reproductive biology of this species in Bangladesh has so far not been documented. A total of 79 fish samples were collected from March 2016 to February 2017. The overall sex ratio was female biased (1.30:0.97) though chi-square test did not reveal any significant difference (p<0.05) from the expected 1:1 ratio. Analysis of the morphometric characters indicated b value was higher in females in terms of standard length to total length. The exponential forms of the length-weight relationship was W= 0.00451L3.427 and W = 0.8658 L 1.785 for females and males, respectively. The highest condition factor for female (0.53) and male (1.62) was recorded in September. For conservation and management of the H. menoda species it is recommended that restriction on fishing of this species should be ensured.

Keywords: Hemibagrus menoda; Sex ratio; Length-weight relationship; Condition factor

Location: Kongsha river located at Jaria – Jhanjail, Netrakona district, Bangladesh

Start Date: 00-03-2016

End Date: 00-02-2017

Program Area: Animal Health and Management

Commodity: Cat fish

Objectives:

So far, there is no record of assessment of the population of H. menoda in aspects of its reproductive biology. The aim of this study was to establish the sex ratio, Length-weight relationship and condition factor of this stock which might be used to determine the growth pattern, yield and well-being of this fish species for effective management and conservation of the stock.

Methodology:

Seventy nine (79) fish samples of Hemibagrus menoda were collected monthly (March 2016 – February 2017) from Kongsha river located at Jaria – Jhanjail, Lat 250 0′ 41.10″ N and Longitude 900 38′ 27.16″ E [15] in the Netrakona district, Bangladesh. Standard length ranged from 16.9 to 40 cm for both sexes while body weight ranged from 220 – 1370 g. Males were distinguished from females primarily by the possession of genital papillae just before the anal fin. Sex ratio was determined by dividing the number of females with the number of males. The chi-square test was adopted to determine whether the proportion of females differ from the proportion of males using the formula:

χ² = ∑ (O-E)/E,

Whereby; χ² =Chi-square test O = observed values E = expected values The null hypothesis (HO) that there is no difference between the proportion of females and the proportion of males was tested at p (0.05).

Standard length (SL), Fork length (FL) and Total length (TL) were measured using a meter scale mounted on a wooden support while the Head length (HL), Head depth (HD) and Depth of Caudal peduncle (DCP) were measured using a slide caliper. The body weight was taken using a digital balance with a precision of 0.01 g (Model: HL-300A AND company limited). The relationship between the SL and the various lengths was established using the least squared linear regression equation Y = a + bX, whereby Y stands for different body lengths, X for SL while a and b are constants of the equation. The point estimates obtained from this equation were then used to estimate population data at 95% confidence level. To establish a mathematical relationship between length and weight and the growth pattern of the H. menoda based on the 12 months data of the samples obtained from the Kangsha river, the Length – weight equation W = aLb was used, whereby W = weight of the fish, L = length while a and b are constants. This cubic equation was first log transformed to linear equation thus: ln W = ln a + b ln L. In this equation, a is the intercept and b is an exponent indicating the growth pattern. The growth pattern of the H. menoda samples will be regarded as isometric when the b value is equal to 3 and allometric when it significantly differs from 3. The Fultons condition factor was calculated from the predetermined L-W equation W = aLb . The `a′ value in the equation is considered the ideal physical condition of an individual fish in the sample which is compared with the value obtained from the Fultons condition factor using the formula:K = W/L^b

All data analysis was performed using SPSS version 20 software.

Source of Information: International Journal of Fisheries and Aquatic Studies 2017; 5(5): 49-54

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The research revealed that female H. menoda population slightly predominates in the Kangsha river, Netrakona. It was found that though the female fishes showed a positive allometric growth pattern, overall, the male menoda catfish exhibited better physical condition. The findings from this study would serve as yardstick for the identification and prediction of the Length-weight relationship of H. menoda in Kangsha river Netrakona. For sustainable management of this fishery, it is recommended that restrictions on fishing of both female and male fish should be ensured especially during the breeding season.

Knowledge Management: Journal