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Fecundity of Thai Sarpunti (puntius Gonionotus), Nursing and Rearing of Its Fry in Some BAU Ponds in Bangladesh

M.M. Hasan
Department of Fisheries Management, Bangladesh Agricultural University, Mynemsingh-2202

M.A. Alam
Bangaldesh Fisheries Research Institute, Riverine Station, Chandpur

M.B.A Talukder
Department of Fisheries Management, Bangladesh Agricultural University, Mynemsingh-2202

M.A. Islam
Department of Fisheries Management, Bangladesh Agricultural University, Mynemsingh-2202

M.M. Kamal
Department of Fisheries Management, Bangladesh Agricultural University, Mynemsingh-2202

Abstract/ Executive Summary:

An experiment was carried out to know the fecundity, gonadosomatic index (GSI) and growth of Thai sharpunti fry under nursing and rearing system for the period from February to August, 2007. For establishment of relationship between fecundity, body weight, gonad weight, fish size and GSI (%), 10 fishes were randomly selected. The average fecundity of each brood fish was 3704, and average gonad weight, fish weight and gonadosomatic index (%) was 10.39g, 139.75g, and 7.49% respectively. Four days old spawn hatching of P. gonionotus were reared for 4 weeks in four ponds of 85m² at stocking of 4 and 6 million/ha. Supplementary feed of rice: mustard oil cake 1:1 in twice was provided daily at a rate of 3 kg /million spawn for the first seven days and was increased by 2 kg/million every week thereafter. Growth of fry was observed and recorded survival rate was 66.5% and 56% at stocking densities of 4.0 and 6.0 million/ha respectively. Stocking at 6.0 million/ha appears to be the most efficient strategy for nursing. In rearing condition of Thai sharpunti, the growth, survival rate, gross and net yields were tested under two rearing techniques i.e. feed supply technique and fertilizer supply technique. The ponds were stocked at rate of 35,000 fingerlings/ha. Comparatively high survival rate (90%) was recorded in the supplementary feeding pond than the fertilized pond (82%). With respect to growth, highest net increase and percentage of increase both in length (10.66 cm & 300.28%) and weight (92.95 g & 827.7 %) were recorded in the supplementary feeding pond than the fertilized pond. Similar to growth rate, highest gross (3807.37 kg/ ha/ 5 months) and net (2886.2 kg/ ha/ 5 months) yields of fish wee recorded in the supplementary feeding pond than the fertilized pond.

Keywords: Fecundity, Puntius gonionotus, Nursing, Rearing, Growth

Location: Field Laboratory of the Faculty of Fisheries in Bangladesh Agricultural University, Mymensingh

Start Date: 01-02-2007

End Date: 30-08-2007

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

1. To find out the fecundity of the Puntius gonionotus and develop an appropriate technique for nursing and rearing of Thai sharpunti fry in Bangladesh.

Methodology:

Study period: The present study was conducted in the Field Laboratory of the Faculty of Fisheries in Bangladesh Agricultural University, Mymensingh. The experiment was done in research ponds in the field laboratory. The experiment was conducted to study the fecundity, nursing by using feed and rearing the fry in the pond under fertilized and feeding conditions for a period of 7 months (lst February to 30th August, 2007). Study area: The experiment was conducted in four ponds having 85 m² and the depth of the water varied from 1 to 1.5 m during the experimental period. The pond was numbered serially as ponds number I, II, III, and IV for the convenient of the study. The main sources of water supplied in the ponds were rain water and deep tube well water. Pond preparation: Prior to initiation of the experiment the ponds were cleared from vegetation dried, limed (250 kg/ha) and manured with cowdung at the rate of 2500 kg/ha, urea and triple superphosphate were also applied to the pond at the rate of 25 kg and 37.5 kg/ha, respectively after filling the ponds with water. Collection of brood fish and stocking in pond: The brood fish of P. gonionotus were collected from Bangladesh Agricultural University Fish Farm. The fishes were brought to the research site in buckets and acclimatized before releasing in the ponds. The collected brood fishes were 3 months old averaging 135.75 g in weight and 14.00 cm in length. Ten fishes were used for the study. Management of brood fish pond: After stocking, the fishes were fed once a day in the morning at about 10 am at 10% of body weight. The feed consisted of 60% wheat bran, 30% Mustard oil cake, and 10% flour. The feed was given in the form of balls i.e. dough form. Water from the near by deep tube well was supplied to the brood fish pond and required to maintain a water depth of 1.5 m. Estimation of the fecundity: Fecundity was taken accurately because it varies for the size and age of the fishes. Gravimetric method was applied in the present studies. On the other hand, the two lobes of the ovary of P. gonionotus are connected along their dorsal surfaces by a thin mesentery from which they are suspended in the abdominal cavity. Two lobes are elongated and found to be of the same size. The anterior parts of the ovary are more or less triangular. A well known method which is frequently applied to determine the pawning frequency of fishes and crustaceans. GSI was calculated by following formula: GSI% = (Weight of Gonad / Weight of fish) x 100. And fecundity was estimated by using following formula, F = [(N x Gonad weight)/ Sample weight)] x 100, Where, F is the fecundity and N is the number of eggs in the sample. Nursing and rearing experiment: Four days old Thai sharpunti (P. gonionotus) spawns were stocked (6 million/ha and 8 million/ha in different four ponds) in earlier morning having the average length of spawn was 3.61 mm and weight 0.22 g with two treatments. The experiments were carried out for four week. After one month the survival rate, length and weight of P. gonionotus was estimated. When the size of P. gonionotus was 3.1 cm in length and 9.93 g in weight after 28 days rearing then the fish was stocked in fertilized and feeding ponds for rearing experiment. The stocking density of both ponds was 35000/ha for five months fries rearing under two treatments. In one treatment (T₁), the fishes were fed with rice bran and mustard oil cake 1:1 as supplementary feed. In another treatment (T₂), organic and inorganic fertilizers were applied weekly in pond III and pond IV at the rate of 10 kg/ha urea 14 kg/ha TSP and 705 kg/ha cowdung. The feed was prepared by mixing the finely powdered mustard oil cake and rice bran in the ratio 1:1 and feed at the rate of 5% body weight in treatment (T₁) and in treatment (T₂). Water quality parameters: Temperature, dissolved oxygen (DO) and pH of water in each pond under each treatment were recorded on sampling dates. Temperature was recorded by using a Celsius thermometer, transparency was measured by secchi disk, DO was measured by a digital DO meter (Multi 340i/set, Germany) total alkalinity was measured by and pH was measured by a portable digital pH meter (MICRO-TEMP, pH 500). Estimation of Growth: For estimation of growth, following parameters were used: Weight gain = [(Mean final fish weight -Mean initial fish weight)/Mean initial fish weight]x100. Survival rate (%)= (No. of harvested fish /No. of stocked fish)x100. Statistical analysis: For the statistical analysis of the data, one-way ANOVA and DMRT were done by using the SPSS (Statistical Package for Social Science) version-10.0. Significance was assigned the 0.5% level. Duncan’s Multiple Range Test (DMRT) was used to tests the results of multiple rangers for comparisons of averages.

Source of Information: J. Agrofor. Environ. 3 (1): 89-93, 2009; ISSN 1995-6983

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The highest growth rate and yield of this were obtained with supplementary feeding than the fertilization only. It can be concluded that the fish may be the best grown under supplementary feeding condition for maximizing its yield. The present level of yield of this fish might be increased to great extent by rearing it under highest stocking densities with relatively improved supplementary feeding.

Knowledge Management: Journal