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Length-weight Relationship and Condition Factor (kn) of Gobi, Glossogobius Giuris (hamilton) from "atrai River" in the Northern Part of Bangladesh

Abdur Razzaq Joadder
Development of fisheries, University of Rajshahi, Rajshahi-6205, Bangladesh.

Abstract/ Executive Summary:

Length-weight relationship and relative condition factor (K_n) of freshwater fish Bar-eyed Gobi: Glossogobius giuris (Hamilton) from the northern part of Bangladesh. They were studied from 627 specimens ranging from 5.6-23.8 cm in total length for 6 months from July 2003-December 2003. Length-weight relationship is shown by the following equations: Log w = -1.8419 + 2.768xlog L (for males) and log w = -1.708 + 2.667xlogL (for females). The relative's condition factor (K_n) was determined for either sex separately. Mean K_n for males and females was found to be 1.0555 and 1.00465, respectively. The length-weight relationship and relative condition factor show that the growth of G. giuris is satisfactory in the population that freshwater fish of the "Atrai river" in Noagaon district.

Keywords: Glossogobius giuris, Atrai river, Condition factor, Bar-eyed, Gobi.

Location: Atrai river, District Noagaon, the northern part of Bangladesh.

Start Date: 00-07-2003

End Date: 00-12-2003

Program Area: Resource Development and Management

Commodity: Fish

Objectives:

To the development of culture techniques of the species in ponds.

Methodology:

Fish samples were collected monthly from July 2003-December to, 2003 from the various fishermen of the Atrai river, District Noagaon. A total of 627 specimens of G. giuris (316 males and 311 females), ranging size from 6.8-23.8 cm males, 5.6-23.6 cm females in Total Length (TL) and weight of 2.81-89.62 g males, 2.01-128.5 g females were used for the analysis. Length of fishes was measured to the nearest cm and weight up to g by using a scale-sensitive portable electronic balance (Model no. 0801580, A and D CO. Ltd., Korea), respectively. The measured fishes were sexed by observing the gonads after dissecting the abdomen. The length-weight relation of the fish was calculated from the logarithmic formula: log w = loga + bxlog L; Ponderal index (K_n) was observed separately for males and females of different length groups. It was calculated for each 1 cm length interval. The smoothed mean weights w, for each length group has been completed from the log formula and LeCren's (1951) modified formula: K_n = w/aLⁿ has been adapted for the calculation of the relative condition factor.

Source of Information: Journal of Fisheries International, Volume 4 Issue 1, 2009

Article Link (Online Journal): URL: https://medwelljournals.com/abstract/?doi=jfish.2009.1.4

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It was calculated for each 1 cm length interval. The smoothed mean weights w, for each length group has been completed from the log formula and LeCren's (1951) modified formula: Kn = w/aLn has been adapted for the calculation of the relative condition factor.

Knowledge Management: Journal