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Fecundity of Glossogobius Giuris (ham.) and Relationship Between Fecundity and Length-weight

A. M. Hasnein Bin Tareque*
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Sanjida Huque
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Md. Moshiur Rahman
Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh

Abstract/ Executive Summary:

The fecundity of Glossogobius giuris (Hamilton) was estimated from 60 gravid females collected from local markets of Khulna during May to July 2005. Total length (TL), standard length (SL), total weight (W) and gonad weight (GW) were recorded and standard methods were used to calculate the fecundity and lengthweight relationship. The fecundity of the species ranged from 39,173 (total length of 14.4 cm, body weight 22.79 g and egg weight 1.49 g ) to 557,892 (total length of 24.06 cm, body weight 104.56 g and egg weight 11.5 g). The mean fecundity was recorded as 280,315.89±102,223.51. The total gonad weight varied from 1.49 g to 11.5 g where the weight of the left lobe and right lobe of the ovary varied significantly (p<=0.05; t-value= - 2.536, equal variances assumed) from 0.7 g to 4.98 g and 0.71 g to 5.06 g respectively. The mean total egg weight was calculated at 5.99±1.82 g where the mean left lobe was calculated at 2.75±0.91 g and right lobe 3.17±0.90 g. The condition factor varied from 4.47 to 9.69 and the mean value was 8.09±0.72. The regression equation for total length and fecundity of the fish was estimated as F = 39,515.10 T – 531,548.17 (r = 0.683), Standard length and fecundity estimated as F = 50,366.48 S –502,295.20 (r = 0.664), Body weight and fecundity estimated as F = 4,430.22 W – 35,322.55 (r = 0.715), Gonad weight and fecundity estimated as F = 51,556.05 G – 28,762.62 (r =0.918), fecundity and condition factor estimated as F = 213,986.53 + 8,203.75 cf (r = 0.058). The diameter of the eggs of the left lobe varied from 5.3 to 8.6 µm with a mean of 7.4±0.6 µm while the right lobe varied from 5.1 to 8.9 µm with a mean of 7.2±0.8 µm. At 5% level of significance, log value of fecundity-gonad weight and fecundity-condition factor showed the most and the least significant relationship respectively.

Keywords: Fecundity, Freshwater gobi, Glossogobius giuris, Condition factor, South-western region, Bangladesh

Location: Local markets of Khulna

Start Date: 00-05-2005

End Date: 00-07-2005

Program Area: Animal Health and Management

Commodity: Fish

Objectives:

In this perspective the present study was undertaken to determine the fecundity and average egg diameter of G. giuris. The relationships between the fecundity and total length, standard length, body weight and gonadal weight of the species have also been carried out.

Methodology:

Sample collection: Sixty gravid female of G. giuris were collected from the local market of Khulna during May to July 2005. Only mature females of different size were collected by examining the swallowen abdomen and anus. The collected specimens were brought to the Biological Laboratory of FMRT Discipline, Khulna University, Khulna.

Laboratory Measurements: The total and standard lengths were measured in centimeters (cm) a measuring scale. The weight of the individuals was measured with a sensitive (3 decimal places) electric balance in gram (g). The fishes were dissected out by scissors, cleaned with distilled water and then were measured to the nearest to 0.1 g by an electric balance. The two lobes of the gonad were also measured in g separately. Diameters of the eggs were measured in microns under a sterio microscope using ocular and stage micrometer. Egg samples were taken from anterior, middle and posterior parts of each of the lobes.

Fecundity estimation: Gravimetric method was applied in the present study. From the ovary six crosssectional samples were dissected along with the accompanying membranes from the anterior, central, posterior regions of each of the lobes of each gonad. Total eggs in each of the six sub-samples were counted with the help of a magnifying glass and a needle. The number of eggs of the samples was multiplied by the total weight of both lobes of ovaries to get the total number of eggs of a particular fish. Thus the fecundity was obtained by using the following formula:

F= (N x Gonad weight) / Sample weight (Shafi et al., 1979; Dewan and Doha, 1979 and Miah and Dewan, 1984)

Where F is the fecundity and N is the number of eggs in the sample.

Condition factor estimation: The condition factor was calculated using the following formula:

K = W X 10³ / L³(King, 1997)

Where, W= weight of the fish; L= length of the fish; K= condition factor and 103 = the factor bringing the ponderal index or condition factor (K) near unity.

Source of Information: Khulna University Studies, 8(1): 99-107, 2007

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the significant ‘t’ values in the present study it may be concluded that fecundity increases in G. giuris with the increase of its total length, standard length, body weight and gonad weight. The peak condition factor values for combined sexes, male and female Glossogobius giuris decreased gradually with increasing size is reported by Akter (2000). But no significant relationship (R2 = 0.00) was found between fecundity and condition factor. It should be considered that fecundity of fish may vary with different level of sexual maturity and also with seasons, climatic conditions and environmental habitat, nutritional status and genetic potential. This study had few limitation like comparatively small sample size and the sample was not collected throughout the year. Therefore, more studies are needed to get clear picture on it.

Knowledge Management: Journal