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Fecundity and Gonadosomatic Index (gsi) of Corsula, Rhinomugil Corsula Hamilton, 1822 (family: Mugilidae) from the Lower Meghna River Estuary, Bangladesh

H. Akter
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali-3802, Bangaldesh

M.R. Islam
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali-3802, Bangaldesh

M. Belal Hossain
Biology Group, FOS, University of Brunei Darussalam, Gadong, Brunei BE1410

Abstract/ Executive Summary:

Gravid females of Rhinomugil corsula were collected from the lower Meghna River Estuary adjacent to Noakhali District, Bangladesh to study the fecundity and Gonadosomatic Index (GSI) of the species. The fecundity was in the range of 9506 to 16113 with a mean value of 11902.133±543.377 for a corresponding length and weight 17-20.9cm and 68.71-82g. The correlation coefficient for fecundity and total length (TL), fecundity and body weight (BW), fecundity and gonad weight (GW) and gonad weight (GW) and body weight (BW) were 0.907, 0.978, 0.984 and 0.995 respectively. The mean GSI (%) was 4.54±0.16 with a range of 3.72-5.54. The regression line for the TL, BW, GW and GSI of the sample fishes were found to be linear when they were plotted against their fecundity. All the variables observed were significant at P<0.01.

Keywords: Fecundity, Gonadosomatic Index, Rhinomugil corsula

Location: Meghna River Estuary adjacent to Noakhali District, Bangladesh

Start Date: 00-06-2011

End Date: 00-08-2011

Program Area: Animal Health and Management

Commodity: Fisheries diversity

Objectives:

To investigate the fecundity and GSI of Rhinomugil corsula undertaken in the present study.

Methodology:

A total number of 15 female Corsula were collected from the lower Meghna River Estuary, Bangladesh from June to August 2011 for the determination of fecundity and GSI. External morphological features were used to distinguish the matured females. Bulged abdomen of the female fish was easily distinguished as matured conditions. In the laboratory, the selected fishes were clearly washed with tap water. For each fish, total length (TL) was measured with a measuring scale to the nearest millimeter and body weight (BW) were measured by an electronic balance. Excess water from fishes was removed with blotting paper before weighing the fishes. The gonads were dissected out and weighed to the nearest 0.01 g. Gonadosomatic index (GSI %) was calculated as gonad weight divided by total weight multiplied by hundred. After ranging weight, the ovary was fixed in 5% formalin for enumeration of fecundity. To estimate the fecundity, the gravimetric method was followed. Three cross-sectional samples were taken from anterior, middle and posterior portion of the two lobes of each ovary. The eggs in each of the three sections were counted and then the mean number of eggs was calculated. The total number of eggs for each individual was calculated from the sample mean and the total weight of the ovaries. To establish the relationship between fecundity (F) and total length (TL), body weight (BW) and ovary weight (OW) correlation coefficients were calculated. The relationship between gonad weight (GW) and body weight (BW) was also established.

Source of Information: Global Veterinaria 9 (2): 129-132, 2012, ISSN 1992-6197

Article Link (Online Journal): DOI: 10.5829/idosi.gv.2012.9.2.6431

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Ovary of Rhinomugil corsula was bi-lobbed with a short oviduct, situated in the body cavity dorsal to the digestive tract and central to the kidney. The shape and size of the ovary were found to depend on the stages of sexual maturity of the female. The ripe ovaries were found to extend up to the end of the urinogenital pore. The eggs were spherical in shape. The mean fecundity of R. corsula was 11902.133±534.377. The mean total length of R. corsula were 18.47±0.28cm, mean total body weight of 73.14±1.35g and mean gonad weight of 3.35±0.187g. The minimum fecundity, total length, body weight and gonad weight were 9506, 17cm, 68.71g and 2.49g respectively; while the maximum fecundity, total length, body weight and gonad weight were 16113, 20.9cm, 82g, 4.54g respectively. The correlation co-efficient for fecundity and total length (TL), fecundity and body weight (BW), fecundity and gonad weight (GW) and gonad weight (GW) and body weight (BW) were 0.907, 0.978, 0.984 and 0.995 respectively. The mean GSI (%) was 4.54±0.16 with a range of 3.72-5.54. The regression line for the TL, BW, GW and GSI of the sample fishes were found to be linear when they were plotted against their fecundity. All the variables observed were significant at P<0.01.

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