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Study the Production Performance of Carp Poly-culture in Earthen Ponds at Bapard by Using Natural Feeds in Winter Season

MM Nabi
Director (IC), Bangabandhu Academy for Poverty Alleviation and Rural Development (BAPARD), Kotalipara, Gopalgonj, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted to compare the production performances of different carps i.e. Rohu (Labeo rohita), Catla (Catla catla), Mrigal (Cirrhinus cirrhosus) and Silver carp (Hypophthalmicthys molitrix) in different stocking densities of poly-culture by using natural feeds in winter season. Three treatments each with three replications were maintained and the stocking densities of carps were 32, 64 and 128 per decimal in T1, T2 and T3 respectively. The ratio of stocking for Rohu, Catla, Mrigal and Silver carp were 5:1:1:1. The water quality parameter such as pH, temperature, dissolved oxygen and transparency were observed fortnightly. The obtained results showed that the highest weight was gained at 470.12±0.76 g in treatments T1 by Silver carp, followed by Mrigal (401.70±0.31g), Catla (410.10±0.30 g) and Rohu (450.10±0.30 g). Similarly, the highest length was obtained in treatment T1 by Silver carp at 37.10±0.30 cm followed by Rohu at 25.75±1.13 cm Catla at 28.47±2.50 cm and Mrigal 24.33±1.20 cm. However, both the weight gain and the length gain were the lowest in treatment T3 for all species. On the other hand, the highest SGR% was found in treatment T2 for Mrigal (2.10) and the lowest SGR% was in T3 for Rohu (1.37). The highest survival (%) of the fishes was found in treatment T1 than those of treatments T2 and T3. Furthermore, the highest production was obtained in treatment T3 (12.35 kg/dec.) followed by T2 (11.56 kg/ dec.) and T1 (10.19 kg/dec.). The BCR was calculated 1:1.28 for T1, 1:0.75 for T2 and 1:0.03 for T3. The findings of these experiments revealed that among three treatments, the stocking density 32 per decimal (T1) is the most suitable.

Keywords: Production performances, Stocking densities, Winter season, Natural feed, SGR, Survival, BCR

Location: Pond of BAPARD campus, Gopalganj

Start Date: 00-11-2019

End Date: 00-03-2020

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

Availability of ponds in this area has the great potentiality of fish production applying natural feed in polyculture system. Maximum pond in the rural areas become unused that can be brought under culture system due to feed cost. Therefore, the present study was conducted to know the contribution of natural feed during winter season (most of the water remain unused). The study is expected to provide some valuable information to the fish farmers. It is expected that the findings of the work will be helpful to prepare a guideline for sustainable carp poly-culture practices.

Methodology:

Study area: The present experiment was carried out for a period of 150 days from November/2019 to March/ 2020. It is located at the Pond of BAPARD campus, Gopalganj (located at 22.9833°N 89.9917°E).

Experimental design Three different stocking densities (32 nos/dec., 64 nos/dec. and 128 nos/dec.) for T1, T2 and T3 respectively) of rohu, catla, mrigal and silver carp with a ratio of 5:1:1:1 were assessed using three replication for each treatment.

Pond preparation The ponds were drained out completely and aquatic weeds were removed manually. Liming was done in all ponds at the rate of 1 kg/decimal. One week after liming the ponds were filled with water and fertilized with urea and TSP at the rate of 200 gm/decimal and 100 gm/decimal respectively. TSP was soaked overnight, then urea and TSP were dissolved together and spread manually on pond water surface at sunny day (10-10.30 am). To enhance the growth of natural food for the carps, fertilization was done with urea (200 gm/dec) and TSP (100 gm/dec) ten a month. The ponds were same in size (10 dec.) and similar in shape and depth.

Collection of experimental fish All the carp fingerlings were collected from Sonali Fish Farm and hatchery (Pvt) Limited, Kotalipara, Gopalganj.

Water quality parameters Water quality parameters of the experimental ponds were recorded throughout the study period. The water temperature (ºC), dissolve oxygen (ppm) and hydrogen ion concentration (pH), ammonia (NH3) and Nitrite (NO2) were monitored at the beginning and end of the experiment by using proper instrument.

Estimation of growth performance Sampling was done 15 days interval from each pond by cast net and the weight of fish was recorded by using electric balance (Model:FKS-5000). After harvesting of fishes final weight were recorded and following parameters were used to evaluate the growth and production of the fishes. Mean length gain (cm) = Mean final length (cm) – Mean initial length (cm).

Weight Data analysis The recorded data were entered into the spreadsheet in MS Excel 2010 and then summarized properly before statistical analysis. After entering the data, the descriptive statistical analyses were done by MS Excel. The inferential T-test was carried out using SPSS (Statistical Package for Social Sciences) version 22.

Source of Information: International Journal of Fisheries and Aquatic Studies 2021; 9(1): 217-222

Article Link (Online Journal): DOI: https://doi.org/10.22271/fish.2021.v9.i1c.2405

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

During the winter season, most of the ponds are remain unused due to low water levels and the unavailability of fish fingerlings. Therefore farmers are not agreed to invest any inputs in their ponds during the winter season. So it was observed that carp poly-culture using natural feed (inorganic fertilizers) can be done during the lean season in winter. The fertilizer treatments effect was found to be significant and strongly influenced water quality and primary production. In the end of the experiment, it was suggested that low stocking density with the highest BCR T1 had more viable for carp production in polyculture by using the natural feed in the winter season.

Knowledge Management: Journal