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Fecundity Estimation of Indian Potasi, Neotropius Atherinoides in Bangladesh

Shajjad Hossian
Senior Upazilla Fisheries officer, Department of Fisheries (DoF), Ministry of Fisheries and Livestock, Bangladesh

Sudip Bhattacharya
Senior Upazilla Fisheries officer, Department of Fisheries (DoF), Ministry of Fisheries and Livestock, Bangladesh

Md. Atiar Rahman
Senior Upazilla Fisheries officer, Department of Fisheries (DoF), Ministry of Fisheries and Livestock, Bangladesh

Rashedul Islam
Senior Upazilla Fisheries officer, Department of Fisheries (DoF), Ministry of Fisheries and Livestock, Bangladesh

Rabeya Yesmin
Senior Upazilla Fisheries officer, Department of Fisheries (DoF), Ministry of Fisheries and Livestock, Bangladesh

Salina Akhter Sume
Department of Fisheries Biology and Genetics, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Md. Moniruzzaman
Scientific Officer, Bangladesh Fisheries Research Institute, Ministry of Fisheries and Livestock, Bangladesh

Abstract/ Executive Summary:

Fecundity estimation has obvious significance in aquaculture, since the size of brood stock, amount of rearing facilities and necessity of other equipment’s are dependent on fecundity. The study has been conducted on fecundity estimation of Indian potasi, Neotropius atherinoides, based on 202 females collected from the Kangsha River flowing through Netrokona district during the period from January to June 2013. The standard length (SL) range of female were 47-66, 50-64, 57-68, 50-66, 56-66 and 60-76 mm and range of body weight were 1.07-3.56, 1.23-3.35, 2.36-3.81, 1.69-4.31, 2.33-5.59 and 3.18-5.14 g in January, February, March, April, May and June, respectively. The mean Gonado somatic indices (GSI) were very low from January to March but these were abruptly high during subsequent three months. Based on mean GSI the spawning season of this species was assumed from April to June over the study period. Scatter plot of standard length with corresponding GSI revealed that the minimum length of mature female was 50 mm SL. Egg diameter frequency distribution of a mature ovary showed almost only one major mode of egg size suggested that the fish is a single spawner, and summation of eggs in that mode was regarded as the fecundity of a female Indian potasi. The regression equation of the relationship between standard length and fecundity was as, Fecundity = 0.0017 SL ^3.55. The relative fecundity and the absolute fecundity of a fish having SL of 62 mm was 1477 per g and 3921, respectively based on F-SL relationship. The relationship between body weight and fecundity was as, Fecundity = 1371.3 BW-650.8. The absolute fecundity of a fish having BW of 3.51 g was 4162 respectively based F-BW relationship. The relationship between ovary weight and fecundity was as, Fecundity = 6244.3 OW + 967.52. The absolute fecundity of a fish having ovary weight of 3.51 g was 7211 based F-OW relationship. The correlation coefficient of all above analyses were very high (>0.755) attributing that standard length, body weight and gonad weight were highly positively correlated with fecundity of Indian Potasi, Neotropius atherinoides.

Keywords: Indian potasi, Fecundity, Relationship, Bangladesh

Location: Kangsha river at Netrokona sadar Upazila in Netrokona district

Start Date: 00-01-2013

End Date: 00-06-2013

Program Area: Animal Health and Management

Commodity: Cat fish

Objectives:

To determine the spawning season, ascertain the minimum length of first maturity and establish relationship between fecundity and standard length, fecundity and body weight and fecundity and ovary weight.

Methodology:

Study area and period- For the study of the fecundity, a total of 362 N. atherinoides were collected from Kangsha river at Netrokona sadar Upazila in Netrokona district during the period of January 2013 to June 2013. Each month at least 25 females were collected. Preservation of fish specimen-After collection of the specimen the color, fins, abdomen status were observed and recorded. The specimens were preserved in 10% formalin and labeled. Then the specimen was brought to the Water Quality and Pond Dynamics Laboratory of Bangladesh Agricultural University, Mymensingh, Bangladesh for further study. Recording of length, weight and ovaries-The total length, fork length, standard length and the body weight of each specimen were recorded separately to the nearest centimeter scale and gram respectively. For the accuracy of weighing excess moisture attached to the fish was dried off with the help of blotting paper before taking the weight.The collected fishes were dissected out and whole mass were removed carefully form the ovarian wall. The paired ovary of the individual fish was removed and carefully placed on a petridish from female fishes. Ovary was washed, cleaned; weights and length of the ovary were taken by using electric balance and scale. Fecundity estimation-In this experiment Gravimetric method (Lagler, 1956) was used for estimation of fecundity. Prior to estimation oocytes from samples (0.001 g) obtained from three portions (anterior, middle and posterior) of five ovarian lobes were randomly counted and measured to determine whether they had significant differences between locations. A section of about 2 mm long was cut from middle part of the right ovary, weighing to nearest 0.001 g (gw). A frequency distribution of egg size by 1 mm interval was constructed, the number of eggs in the largest modal group, b was summed. Fecundity, F was calculated by using the formula: F = GW*(b/gw). Gonadosomatic index (GSI) of the females collected in January, February, and March were very small. Fecundity study was done with the females of larger GSI collected in April, May and June. Relationship of fecundity on lengths, weights and ovary- The equation describing the relationship between fecundity and standard length, body weight and fecundity, ovary weight and fecundity (Bagenal et al., 1967) are given as: F = SLb; lnF = b; lnL + a F = bBW + a; F = bOW + a.where, F = Fecundity, SL = Standard length in cm, b = Slope of the regression line (regression constant). a = Intercept of the regression with the y- axis (regression coefficient)., BW= Body weight. OW= Ovary weight. Calculation of the gonadosomatic index (GSI)- Gonadosomatic index (GSI) is the percentage of gonad weight to the total weight of the fish. The GSI of the collected fish was calculated for each of the female separately. GSI for each specimen was calculate as GSI = (Weight of Overy/Weight of Fish) x 100. Measurement of ova diameter-To measure the diameter of ova, random sample of 50 ova was taken and separating in several rows on a glass slide under a microscope.

Source of Information: Res. Agric., Livest. Fish.6(3): 421-429, December 2019

Article Link (Online Journal): DOI: https://doi.org/10.3329/ralf.v6i3.44808

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the present study, the relationships between fecundity and body weight of the fishes were found to be linear and significant. The study has provided some basic information on the size at sexual maturity and fecundity for N. atherinoides that will be helpful to evaluate reproductive potential of individual fish species in similar studies. Further, it would be useful for fishery biologist or manager to impose adequate regulation for sustainable fishery management for the control of exploiting fishing of young individuals and when associated with other information aids in evaluation and prediction of fish stock in the different water bodies of Bangladesh.

Knowledge Management: Journal