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Length-length Relationships of Elongate Glass Perchlet, Chanda Nama (hamilton, 1822) from the Old Brahmaputra River, Bangladesh

Nelufa Aktar
Department of Fisheries Management, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Zoarder Faruque Ahmed
Department of Fisheries Management, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Mst. Kaniz Fatema*
Department of Fisheries Management, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh.

Abstract/ Executive Summary:

The generalized length-length relationships of Chanda nama ((Hamilton, 1822) belongs to Ambassidae were studied separately for a period of a calendar year collected from the Old Brahmaputra River, Mymensingh, Bangladesh for male, female and combined populations. A total of 1170 specimens were examined where 599 were male and 571 were female. The standard length, fork length and total length of male ranged from 19 to 79 mm, from 23 to 90 mm, and 28 to 100 mm respectively. The standard length, fork length and total length of female were found from 15 to 81 mm, 24 to 89 mm, and from 29 to 100 mm respectively. The generalized relationships of standard length and fork length, fork length and total length, and standard length and total length of male, female and combined populations were FL = 1.08 SL+1.41, TL = 1.11 FL + 1.54 and TL = 1.20 SL+2.81; FL = 1.09 SL+1.23, TL = 1.12 FL+1.04 and TL = 1.22 SL+2.22; and FL = 1.09 SL+1.20, TL = 1.11 FL+1.27 and TL = 1.22 SL+2.38 respectively. The coefficient of determination (R2 ) revealed high values in all regression analyses. In length–length relationships, the coefficient of determination (R2 ) ranged from 0.973-0.990. The present findings of this study will be helpful for a well-organized and significant exploitation and regulation of the Chanda nama fishery in the Old Brahmaputra River and surrounding ecosystems.

Keywords: LLR, The Old Brahmaputra River, Chanda nama, Bangladesh

Location: The Old Brahmaputra River near Bangladesh Agricultural University, Mymensingh

Start Date:

End Date:

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

The data on length-length relationship is considered to be insufficient for this species in the Old Brahmaputra River; therefore, the present study was conducted to widen the observation of length-length relationships of an important small indigenous species C. nama of Bangladesh.

Methodology:

Study area and fish sample collection: Monthly samples were collected from the Old Brahmaputra River near Bangladesh Agricultural University, Mymensingh (24º75´N, 90º43´E) for a period of one year. The samples were collected using a combination of fine-meshed (< 2 mm) cast and seine nets by the help of local fishermen. A total of 100 fish individuals were collected randomly for every sampling occasion. All specimens at each sampling were preserved with 10% formalin to avoid decomposition of fish and transferred to the laboratory for further analysis.

Recording of lengths: Linear dimension of fish as linear distance of body length which is measured by scale. To carry out present research two linear dimensions of standard length, total length and fork length were considered. Standard length was measured from the tip of the snout (mouth closed) to the last vertebrae, total length from the tip of the snout to the end of caudal fin and fork length from tip of the snout to the fork of the caudal fin. All lengths were taken to the nearest cm with the help of a measuring board. Data were input on the spreadsheet of the computer software, Microsoft Excel.

Gender determination: The body cavity of a fish was cut open carefully by scissors, and gonads were extracted with forceps carefully. Fishes were sexed as male and female observing the gonads with naked eye.

Estimation of length-length relationship: A linear relationship between standard length (SL) and total length (TL) was estimated using the equation: TL= a+bSL where "a" and "b" are constants as intercept and slope respectively. Estimates of "a" and "b" and their 95% confidence limits were computed statistically.

Source of Information: Res. Agric. Livest. Fish. Vol. 8, No. 3, December 2021: 339-347.

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Only negative allometric growth was found in male, female and combined sex Oreochromis niloticus (Adeyemi et al., 2009). In the present study, the high values of coefficient of determination (R2 ) were revealed in all regression analyses. In length–length relationships that (R2 ) ranged from 0.973-0.990. The values of coefficient of determination (R2 ) were very close to 1. This indicates that the length-length (LLR) relationships of Chanda nama were highly correlated. Thus, the present study given valuable details on the length-length relationships of C. nama, which will be helpful to construct conservation and management plan of this species in aquatic ecosystem of Bangladesh.

Knowledge Management: Journal