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Fecundity and Gonado Somatic Index of Gangetic Mud Eel, Monopterus Cuchia (hamilton, 1822)

Binay K. Chakraborty
Matshya Bhaban, Department of Fisheries, Ramna, Dhaka-1000, Bangladesh

S. A. Azad
Matshya Bhaban, Department of Fisheries, Ramna, Dhaka-1000, Bangladesh

B. Barman
World Fish Center, South East Asia Office, Dhaka, Bangladesh.

A.M.O. Faruque
Matshya Bhaban, Department of Fisheries, Ramna, Dhaka-1000, Bangladesh

Abstract/ Executive Summary:

The gonado-somatic index (GSI) and fecundity of Gangetic mud eels Monopterus cuchia were investigated during January to December, 2010 at Sherpur, Bangladesh. Highest GSI value was found in the month of June and the values began to fall gradually from July to December in both sexes. The fecundity ranged from 458.0±31.22 to 1116.0±11.31 in 62 samples having a total length of 54.25±1.71 to 66.05±0.71 cm, body weight from 256.33±45.14 to 492.50±2.50 g and gonad weight from 21.32±4.48 to 55.90±0.98 g. The relationships between body length and fecundity was found to be polynomial of second order of body weight and was expressed as: Y=0.2683 X 2 -1.9383 X+370.72. The regression equation established for fecundity on total body weight was Y=454.37 X-692.8. The regression equation established for fecundity on total gonad weight was Y=19.602 X-27.546. The above equation showed that the relationships between fecundity and total weight was curvilinear. A highly significant (P<0.01) linear relationship was found to exist between fecundity and gonadal weight.

Keywords: Gonado-somatic-index (GSI), Fecundity, Mud eel, Monopterus cuchia

Location: Noukuchi rice field (beel), Noukuchi, Union of Kangsa, Jhenaigati, Sherpur, Bangladesh.

Start Date: 00-01-2010

End Date: 00-12-2010

Program Area: Variety and Species

Commodity: Eel

Objectives:

To generate information on the basis of need of the fishery biologists and hatchery operators.

Methodology:

The study was conducted at the Noukuchi rice field (beel), Noukuchi, Union of Kangsa, Jhenaigati, Sherpur, Bangladesh. Female gonads were collected from April to August 2010. Samples of Monopterus cuchia were collected from the experimental Noukuchi rice field. During the above period, 62 samples were collected to measure the total length and body weight of individual fish. Then the ovary of each fish was taken out very carefully and preserved in 10% buffered formalin for further study. The weight of the ovary was measured very carefully with the help of a sensitive portable electronic balance (Model HL 400 EX). GSI of M. cuchia was calculated according to the formula of Lagler 1956: GSI = (Gonad Weight/Total weight) × 100. Von Vayer method was applied to estimate the fecundity of relatively large size eggs. In this method, 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 measured with the help of an electronic balance. Then 20 mg of each ovary was taken separately from anterior, middle and posterior portions of each lobe accurately. The number of mature and maturing eggs from each portion was counted by a needle. The mean number of eggs (in 20 mg) was determined and then multiplied by the total weight of the ovary, to estimate the total number of eggs. Statistical package MICROSTAT and EXCEL were used to determine correlation co-efficient (r) between total length and fecundity, body weight and fecundity, and gonadal weight and fecundity following the methods of Zar.

Source of Information: Bangladesh J. Zool. 41(2): 165-172, 2013

Article Link (Online Journal): http://www.banglajol.info/index.php/BJZ/article/view/23318/16021

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It is evident from the present study that Gonado Somatic Index (GSI) and fecundity is helpful to identify accurate spawning cycle of M. cuchia. The peak period of spawning season (May-July) of cuchia was identified from the study of GSI value. Identifying the spawning season cycle of cuchia, it would be restricted to catch this fish in the spawning period. At the same time the habitat of water body would be developed for spawning of cuchia. So, the production of cuchia would be increased. Further study would be required to apply the findings the field level.

Knowledge Management: Journal