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Temporal Variations of Condition Factor and Relative Weight for Mystus Gulio (hamilton, 1822) from the Coastal Water in Bangladesh

O Rahman
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

MY Hossain
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

M Ashekur Rahman
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

MA Islam
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

M Ataur Rahman
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

MF Parvin
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

MS Sarmin
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

BK Sarker
Department of Fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh

W Sabbir
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna-9208, Bangladesh

KA Habib
Department of Fisheries Biology and Genetics, Faculty of Fisheries, Aquaculture and Marine Science, Shere- Bangla Agricultural University, Dhaka-1207, Bangladesh

Abstract/ Executive Summary:

The long whiskers catfish, Mystus gulio (Hamilton, 1822), is a valuable, delicious food fish in coastal areas of Bangladesh. It is found in the fresh and brackish water of the South Asian region. The present study illustrates the temporal variation of condition factor (KF) and prey-predator through relative weight (WR) along with length-weight relation (LWR) of M. gulio is the Maloncho River in southern Bangladesh. There were a total of 1200 individuals collected between January-December 2017 and October 2019 to June 2020. Different traditional gears (such as cast net, seine net, square lift net) were used for collecting the fish samples. There were 35% males and 65% females. The total length of fish ranged 7.8-18.3 cm for males and 9.3-22.1 cm for females. The body weight ranged 8.80–72.34 g for males and 8.09-128.82 g for females. LWR was significant with an r2 value >0.950. The calculated coefficient (b) were negative allometric growth in male and female (b<3.0, p<0.001). The KF indicated the best condition of this species. WR revealed no significant difference from 100 for both sex (p = 0.441) and females (p = 0.221), indicating a suitable habitat for growth. From a conservation point of view, the findings of this present study on M. gulio will be helpful in Bangladesh (Maloncho River) and neighboring countries.

Keywords: Coastal waters, Condition factor, Maloncho River, Mystus gulio, Relative weight

Location: Satkhira coastal areas of Bangladesh.

Start Date: 00-01-2017

End Date: 00-06-2020

Program Area: Resource Development and Management

Commodity: Cat fish

Objectives:

This study are to realize fisheries data for formulating management policies for M. gulio.

Methodology:

Study site and sampling- In the Maloncho River, samples were collected from Satkhira (Latitude 21°40' N; Longitude 89°35' E) from January-December 2017 and October 2019 to June 2020. A total of 1200 specimens (male = 420, female = 780) of M. gulio were collected from commercial fishermen, who caught M. gulio using gill net, cast net, and seine net (mesh size 1.5 - 2.5, 1.0 - 2.0, and ~1.0 cm). The samples were immediately preserved on the spot with ice and then fixed on arrival at the workplace with a 10% formalin solution. Microscopic observation of gonads, and morphometric and meristic characters, and identification of sex was carried out. The total length (TL), standard length (SL) and fork length (FL), and body weight (BW) were measured via digital balance and with digital slide calipers. The relation between length and weight (LWR) was measured using W = a*Lb, where W is the total body weight (BW, g), L is the total length (TL, cm), a & b are regression parameters. LWR parameters a and b were determined by ln (W) = ln (a) + b ln ln(L). T-test was used for substantial deviation from the isometric value of b = 3 to validate the growth trend, either isometric or (+/-) allometric. The monthly condition factor for M. gulio was calculated using samples with small to bigger body sizes. Fulton’s condition factor (Fulton 1904) was obtained by KF =100× (W/L3), where 100 for scaling factor, the total body weight (BW, g) is W, and the total length L is (TL, cm). The relative weight was measured by WR= (W / WS) ×100 (Froese 2006), where WS= aLb, WS is the estimated standard weight for the particular individual (where a and b values were deliberated from TL and BW relationships). GraphPad Prism 6.5 software was used for statistical analysis. Homogeneity and data normality was tested. To check the difference of growth type between the sexes, ANCOVA was used. Wilcoxon sign ranked test was performed to know prey-predator status. Statistical significance was tested at a 5% level (p<0.05).

Source of Information: J. Bio-Sci. 29(1): 111-122, 2021 (June)

Article Link (Online Journal): DOI: https://doi.org/10.3329/jbs.v29i0.54827

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From a conservation point of view, the findings of this present study on M. gulio will be helpful in Bangladesh (Maloncho River) and neighboring countries.

Knowledge Management: Journal