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Estimation of Fecundity and Gonadosomatic Index (gsi) of Gangetic Whiting, Sillaginopsis Panijus (hamilton, 1822) from the Meghna River Estuary, Bangladesh

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

N. Sultana
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali

M. Belal Hossain
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali & Biology Group, FOS, University of Brunei Darussalam, Brunei BE1410

S. Mondal
Department of Fisheries and Marine Science, Noakhali Science and Technology University, Noakhali

Abstract/ Executive Summary:

Specimens of Gangetic whiting, S. panijus, were collected from the Meghna estuary to estimate the fecundity and Gonadosomatic Index (GSI) during April-September, 2011. The morphometric and meristic features of the fish were measured. The co-efficient of correlations between total length and head length with other body measurements were significant (P<0.01). The logarithmic length-weight relationship of the fish followed a straight line. The fish followed LeCren’s law, the exponential value in the length-weight equation was found to be 3.480 which are within the range from 2.0-4.0. The fecundity ranged from173745 to 374077 with a mean of 310605.1±22833.84 having an average total length of 36.06±0.52cm, bodyweight of 300.36±24.41g and gonad weight of 28.65±2.98g. The right ovaries of most specimens were more fecund than the left ones. The relationships between the fecundity and the total length (TL), body weight (BW), gonad weight (GW) were linear (i.e., Y=20693X-39511 and r=0.875464 for TL; Y=840.9X+61471 and r=0.943848 for BW; Y=7546X+94066 and r=0.947309 for GW). Gonadosomatic index was found higher (9.95±0.15%) in peak season, August. The findings of the present study highlighted the importance of fish, S. panijus in the fisheries sector of Bangladesh and should be useful for sustainable fishery management in the Meghna River estuary and elsewhere in Bangladesh.

Keywords: Fecundity, GSI, Sillaginopsis panijus

Location: Meghna river estuary, Noakhali, Bangladesh

Start Date: 00-04-2011

End Date: 00-09-2011

Program Area: Variety and Species

Commodity: Fish

Objectives:

To study the morphological is harvested commercially without considering its stock, characters and determining the fecundity and gonadosomatic index of this species.

Methodology:

Thirty samples were collected for six months from Meghna river estuary, Noakhali, Bangladesh during April-September, 2011. In each month, five samples were collected. Total length (TL), body weight (BW), standard length (SL), head length (HL), pre-orbital length (PreOL), eye diameter (ED), post-orbital length (PostOL), snout length (SnL), mouth gap (MG), maximum body circumference (Max BC), minimum body circumference (Min BC) of fish were measured to the nearest cm using fish measuring board. The fishes were weighed on tanetag, KD-160 balance having one gm precision. The body characters viz. SL, HL, PreOL, ED, PostOL, SnL, MG, Max BC, Min BC, were expressed as percent to total length of the fish as done by Carlender and Smith and Hile. Regression of various body parts against TL of fish were drawn by least square method. The length-weight relationship was calculated by cube law as given by Le Cren. log W = log a + b × log L. Where, W is weight, L is the length of fish and ‘a’ and ‘n’ are constants. Ten matured female samples were selected in two months (August-September). Then these matured female samples were dissected and the gonads from each specimen were removed out intact. The matured ovaries were weighed nearest gm by a sensitive balance (Model AR 2140, Germany). These ovaries were then split longitudinally and kept in Petri-dish. Then, weights of right and left gonad were measured. Three samples, each was taken from the anterior, middle and posterior regions of each ovary and kept in Petri-dish. All the ovaries were preserved in 5% formalin solution. After some hours eggs have become large and separate from each other. The numbers of eggs in each of the sub-samples were counted under a magnifying glass after 24 hours and mean value of eggs were computed. All estimated fecundities for the experiment are the total number of eggs in both the ovaries as was followed by Hartman and Conkle. F = n× G/ g. Where “F” is fecundity, “n” is the average number of eggs, “G” is the weight of the gonads and “g” is the weight of the sub-sample. The GSI value was calculated from the ratio of total body weight and gonad weight.

Source of Information: World Applied Sciences Journal 17 (10): 1253-1260, 2012; ISSN 1818-4952

Article Link (Online Journal):

Funding Source:

1.

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The right lobe was found larger in most cases than that of the left one at the ripe stage. In the present study, the mean weight of right lobe was found 15.13±1.58g and mean weight of left lobe was found 13.53±1.4g. Hartman and Conkle observed that 90 percent of the left ovaries of Salmon held more eggs than the right side. The data for the king Salmon in Japanese waters do not show significant differences in egg numbers between the two ovaries. This variation might be the result of species variation. As fisheries items are the major protein contributing sources of Bangladesh, so their sustainable exploitation and management are badly needed. The findings of the present study highlighted the importance of fish, S. panijus in the fisheries sector of Bangladesh and should be useful for sustainable fishery management in the Meghna River estuary and elsewhere in Bangladesh.

Knowledge Management: Journal