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Fecundity and Gonado-somatic Index of Wild Freshwater Spiny Eel Mastacembelus Armatus (lacepede) from Kishoreganj Region of Bangladesh

M. R. Ali
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. F. A. Mollah
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

M. R. I. Sarder
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Fecundity and gonado-somatic index (GSI) of wild freshwater spiny eel Mastacembelus armatus were estimated from haor region of Kishoreganj district of Bangladesh. Estimated fecundity ranged from 2,235 to 19,493 for the fish measuring from 25 to 54 cm and weighing from 79 to 345 g. The minimum, median and maximum ova diameter was 0.20, 1.90 and 2.20 mm, respectively. The average numbers of ova present per g body weight were 45.41±8.85, 46.93±15.00 and 47.52±8.32 while the average numbers of ova present per g ovary were 369.64±40.66, 351.29±30.90 and 328.36±33.00 in the months of April, May and June, respectively. Maximum GSI for female spiny eel was 14.40±1.48 in the month of June and the minimum GSI for the same sex was 0.44±0.06 in September. The regression of fecundity on total length, body weight and gonad weight of female spiny eels were Log F = -0.875 + 2.957 × Log TL (r = 0.874), Log F = 0.630 + 1.461 × Log BW (r = 0.917) and Log F = 2.425 + 1.087 × Log GW (r = 0.977), respectively. Fecundity-gonad weight gave a better relationship when compared to fecundity-body weight and fecundity-total length relationship.

Keywords: Mastacembelus armatus, GSI, Fecundity

Location: Bangladesh Agricultural University, Mymensingh

Start Date: 00-01-2012

End Date: 00-12-2012

Program Area: Variety and Species

Commodity: Aquatic animal

Objectives:

To study the reproductive biology based on fecundity, ova diameter and gonado-somatic index of wild freshwater spiny eel, M. armatus, of haor region of Kishoreganj district of Bangladesh.

Methodology:

The experiment was conducted for a period of 12 months from January to December 2012. 114 female spiny eels were collected from natural habitat of haor region in Kishoreganj district through the fishermen in order to determine gonado-somatic index (GSI) and 42 wild fish of the same species for fecundity study. There are several methods for the estimation of fecundity of fish of which the actual counting method was found to be the most accurate one. Among the methods as outlined by Lagler (1956), gravimetric method is considered to be more efficient and gives fairly accurate result. This method has also been successfully used by Shafi and Quddus (1978); Dewan and Doha (1979); Mustafa et al. (1980) and Blay-Jr (1981). In this method, eels were anesthetized with 0.02% clove oil (Keene et al., 1998). Individual eel was then measured for total length to the nearest cm and body weight to the nearest g. The ovaries were dissected out by a pair of scissors. The external connective tissues were removed from the surface of each pair of ovaries. The moisture of the ovaries was removed with the help of a blotting paper. The weight of the ovaries of each fish was recorded with the help of an electronic balance. Then 1.00 g of ovarian part was taken separately from anterior, middle and posterior portions of each ovarian lobe accurately and gonad samples were fixed at 10% buffered formalin (gonad and fixative ratio being 1:10) for subsequent studies. The gonad samples were swollen heavily, their membrane became transparent and the number of mature and maturing eggs from each portion was found out separately by actual counting. The mean number of eggs in 1.00 g was determined and then multiplied by the total weight of the ovary, which gave the total number of eggs i.e. the fecundity of respective fish. This was done by the following formula: F=(N Gonadweight/Sample weight). When an ovary of a fish was dissected out, a small representative part from anterior, posterior and middle portion of the same was taken separately. The ova of the samples were separated keeping in a physiological saline solution (0.85% NaCl) and spread on a glass slide to measure the diameter of ova under a microscope with an ocular micrometer. However, at least 100 ova of a single sample were measured and observed values for ova diameter were expressed in the unit value of the ocular micrometer according to recommended method given by LeCren (1951).Gonado-somatic index was determined. Several morphological characters were analyzed by Microsoft Excel (MS Excel) computer package as descriptive values such as mean and percentage. Determination of linear relationship and correlation coefficient (r) between total length and fecundity, body weight and fecundity, gonad weight and fecundity was performed using MS Excel. The statistical data analysis was carried out with the aid of the computer software SPSS version 11.5 (Statistical Package for Social Science).

Source of Information: J. Bangladesh Agril. Univ. 11(2): 365–372, 2013 ISSN 1810-3030

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The average numbers of ova present per g body weight were 45.41±8.85, 46.93±15.00 and 47.52±8.32 while the average numbers of ova present per g ovary were 369.64±40.66, 351.29±30.90 and 328.36±33.00 in the months of April, May and June, respectively. Maximum GSI for female spiny eel was 14.40±1.48 in the month of June and the minimum GSI for the same sex was 0.44±0.06 in September. The regression of fecundity on total length, body weight and gonad weight of female spiny eels were Log F = -0.875 + 2.957 × Log TL (r = 0.874), Log F = 0.630 + 1.461 × Log BW (r = 0.917) and Log F = 2.425 + 1.087 × Log GW (r = 0.977), respectively. Fecundity-gonad weight gave a better relationship when compared to fecundity-body weight and fecundity-total length relationship.

Knowledge Management: Journal