Abstract
Hydrological data were collected from the six ponds of 0.05 ha size in the farm of the Central Institute of Freshwater Aquaculture, Bhubaneswar, India. Data on rainfall, run-off, evaporation, and seepage were collected from these ponds for the years 2013 and 2014. The rainfall was 175 ± 3.0 and 202 ± 5.0 cm in 2013 and 2014, respectively. The run-off was 36 ± 1.2 and 29 ± 1.0 cm, in these ponds, in 2013 and 2014, respectively. Average evaporation was 0.30 cm/d in 2013 and 0.37 cm/d in 2014. The average seepage was 0.22 cm/d in both the years. The loss from the evaporation and seepage could be compensated through the regulated inflow of groundwater from wells/canals. The total amount of well/canal water in an average year to compensate the water loss through evaporation and seepage was calculated and for the 1.0 ha pond, 9800 ± 200 m3 of water in 2013 and 13,700 ± 300 m3 of water in 2014. Accordingly, the harvested water could be 12,000 ± 200 m3 in 2013 and 15,000 ± 300 m3 in 2014, respectively. The consumptive water use was 3.15 ± 0.3 m3/kg fish and 3.35 ± 0.2 m3/kg fish in 2013 and 2014, respectively. The total water use in these embankment ponds was 5.15 ± 0.5 m3/kg fish and 5.66 ± 0.6 m3/kg fish in 2013 and 2014, respectively.
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Introduction
Availability of freshwater is reducing day by day, and it is important to know about the minimum requirement of water for the production of 1 kg fish. Thus, water budgeting is important for one kg of fish production. Water budget for some watershed has been reported by Shelton and Boyd (1993). Water budget was done for some experimental ponds of Alabama (Boyd 1982). Green and Boyd (1995) developed water budget for some ponds in the dry tropics. In all the cases, they had considered evaporation loss, seepage loss, annual rainfall, and water inflow–outflow. Thus, water budgets are useful for the estimation of requirements of ponds that rely on rainfall and run-off as primary water sources and for flow-through pond facilities. Such budgets will also be able to predict whether existing potential source will be able to meet the projected water demand of aquaculture facilities, and also in comparing the value of available water for different agricultural proposes (Nath and Bolte 1998). Verma et al. (2010) reported that water expense to produce a single spawn of common carp, Cyprinus carpio, in the hatchery system was 0.56 litre (L), while the water expended to produce one fry was 4.86 L. Water requirement for one complete cycle of fibre-reinforced plastic (FRP) material for carp hatchery operation for rohu, Labeo rohita, was 105–136.3 m3, when spawn production in number ranged between 0.7 and 1.4 million per operation in field condition. It was estimated that the water requirement per 0.1 million rohu spawn production ranged between 8.86 and 15.01 m3 (Mohapatra et al. 2016). Sharma et al. (2013) reported that the water requirement for semi-intensive carp culture with supplemental feeding was 10.3 m3/kg, out of which 7.6 m3/kg was system-associated requirement.
The water use rates in eight brackish water shrimp ponds in Chachoengsao, Thailand, varied from 0.63 to 0.95 cm/d (Braaten and Flaherty 2000). The water use rates in catfish ponds in Alabama and fish ponds in Honduras were 1.16 and 0.87 cm/d, respectively (Boyd 1985; Green and Boyd 1995). The water use rate for coastal shrimp ponds was 0.71 cm/d in Thailand (Briggs and Funge-Smith 1994). Thus, it is evident that so far as aquaculture pond is considered in India, the report on hydrological parameters and water budget for aquaculture practices is scanty. Thus, the present investigation was made to evaluate the important hydrological parameters in some aquaculture ponds in the Central Institute of Freshwater Aquaculture, Kausalyaganga, Orissa, India, to develop water budget.
Materials and methods
Field studies were conducted in six ponds in the Central Institute of Freshwater Aquaculture, Orissa, India (latitude: 20°11′06″N; longitude: 85°50′52″E and msl: 33 m; Fig. A). All ponds were approximately 0.05 hectare in size (Fig. B). The Central Institute of Freshwater Aquaculture consists of around 350 ponds ranging from 0.01 to 4.0 ha in area with depth running from 1.0 to 4.5 m.
The rainfall was measured at the pond site using standard rain gauge, and the data were collected for the years 2013 and 2014. Properly marked bamboo sticks were installed in each pond, and water levels were measured periodically and after each rainfall event. Water depth was also recorded by this method.
The amount of well/canal water added to the ponds could be estimated (Boyd 1982) using the following equation:
where W water from well, E evaporation, S seepage, O overflow, H pond water depth, P precipitation (rainfall), and R run-off. Values for the above equation were in centimetres of water depth. In the present study, there was no overflow of water in any of the ponds. The pond dyke was well compacted and had grass cover. About 67% of rain falling on the dyke entered the ponds as run-off (Yoo and Boyd 1994). The equation for determining run-off for a pond was as follows:
where a dyke area (m2) and A pond surface area (m2).
Class A evaporation pan was used for the measurement of evaporation from the ponds in centimetres using the pan coefficient for evaporation as 0.81 (Boyd 1985). The seepage was estimated in centimetres as the difference in the decrease in water level and evaporation. Data on water gain and water loss and well/canal water additions calculated using the above equation were used to prepare water budgets for the fish culture of these ponds. The evaporation and seepage loss were measured daily, while the rainfall and run-off were recorded as and when they occurred.
Results and discussion
Sources of water (water gain)
The rainfall and run-off are the main water sources in these ponds which are presented in Figs. 1 and 2. The maximum rainfall of 88 cm occurred in the month of October in 2013, while the same was 77.7 cm in the month of July 2014. There was no rainfall in January, March, November, and December months of 2013 and January, February, March, November, and December months of 2014. The total rainfall was 175 ± 3.0 cm in 2013 and 202 ± 5.0 cm in 2014. The average rainfall was 0.48 cm/d in 2013 and 0.55 cm/d in 2014. Total run-off was 36 ± 1.2 cm and 29 ± 1.0 cm in 2013 and 2014, respectively.
The rainfall, run-off, and inflow of water from the canal/well are considered as water gain in these ponds. The water added to these ponds to maintain the water level amounted to 32 and 37% of the overall water gain in the ponds in 2013 and 2014, respectively (Fig. 3). The rainfall was the most significant source of water accounting for 57 and 55% of the water gain in 2013 and 2014, respectively. The run-off in these ponds amounted to only 11 and 8% of the water gain, respectively, in both the years, and this may be due to small dyke area around the pond. Green and Boyd (1995) also reported 4.5% run-off as the water gain in their study at El Carao.
Loss of water
The water loss mainly occurs through evaporation and seepage. The maximum evaporation of 16.11 cm (0.52 cm/d) was in January 2013, while the same was 19.92 cm (0.64 cm/d) in October 2014 (Fig. 4). Total evaporation was 110 ± 5 cm in 2013 and 138 ± 7 cm in 2014. The average evaporation was 0.30 cm/d in 2013 and 0.37 cm in 2014. The maximum seepage loss was 17.8 cm (0.59 cm/d) in November 2013 and 14.2 cm (0.47 cm/d) in September 2014 (Fig. 5). The total seepage was around 80 cm in both the years. Thus, the average seepage loss was 0.22 cm/d in both the years.
Evaporation and seepage contributed 58% and 42% of the water loss in these ponds, respectively, in 2013, while the same was 64% and 36% of the water loss in 2014 (Fig. 6). Evaporation and seepage loss vary from location to location. Evaporation contributed between 2.6 and 4.0 mm/d in Nyangera and Kusa villages around Lake Victoria in Kenya (Kipkemboi et al. 2007). They also reported about the seepage loss of up to 7.6 mm/d in Nyangera during the dry season of 2004. Nath and Bolte (1998) reported that evaporative loss was 0.45 cm/d in Asian Institute of Technology (AIT) ponds. The overall evaporative loss in the present study was 0.33 cm/d. The evaporation loss from the ponds depends on the weather conditions, mainly humidity, dry weathers, size, and depth of the ponds. Boyd (1985) reported that seepage accounted for about 66% of the overall water loss for Auburn ponds, where seepage rates varied from 0.48 to 0.79 cm/d. Nath and Bolte (1998) reported that seepage rate varied from 0.27 to 0.69 cm/d (mean = 0.44 cm/d) in the AIT ponds. The average seepage loss was 0.11 cm/d in the present study. The variation in seepage is mainly due to the type of soil and the method of estimation.
The depth of the pond varied from 100 ± 5 to 220 ± 10 cm in 2013 and the same was 120 ± 6 to 270 ± 12 cm in 2014 (Fig. 7). The storage change was 120 ± 5 cm in 2013 and 150 ± 6 cm in 2014, respectively. The average depth of the pond was 166 ± 6 cm in 2013 and 197 cm in 2014, respectively. In both the years, the minimum depth of the water was observed in the month of May. The maximum water depth was in the month of September in both the years.
Water budget
The water gain and loss and the water budget are presented in Figs. 3 and 6. It is evident from the figure that the rainfall was the main source of water. The rainfall plus run-off was about 21 cm more than evaporation and seepage in 2013, while the same was 12 cm more than evaporation and seepage in 2014. Evaporation was the main loss of water followed by the harvested water. Though evaporation was a major loss of water, nutrients were not lost via this route (Boyd et al. 2007). Nutrients were mainly lost through the harvested water.
The total amount of well/canal water in an average year to compensate the water loss through evaporation and seepage was 98 ± 2 cm and 137 ± 3 cm of water in 2013 and 2014, respectively (Fig. 8). Accordingly, 9800 ± 200 m3 of water in 2013 and 13,700 ± 300 m3 of water in 2014 would be required as added water for the 1.0 ha pond.
The harvested water in 2013 and 2014 was 120 ± 2 and 150 ± 3 cm, respectively. Accordingly, the harvested water could be 12,000 ± 200 m3 and 15,000 ± 300 m3 in 2013 and 2014, respectively, for the 1.0 ha pond. This water is drained out from the pond and utilized as irrigation water for some horticultural crops. Sometimes, this water is retained in the pond and allowed to mix with rain water and then used for the fish culture purposes. If required, this harvested water is treated with alum and lime for settling down the organic matter and plankton from the water and then used for culture purposes. Thus, the harvested water is not considered as water loss.
The total water use in aquaculture pond is the amount of precipitation, run-off, and other natural processes like seepage in and water applied through well or canal for the management practices. Accordingly, total water use in the present study could be 309 ± 11.0 and 368 ± 12.0 cm in a year which could be equivalent to 30,900 ± 1100 and 36,800 ± 1200 m3 for a hectare of a pond in 2013 and 2014, respectively.
The consumptive water use for an aquaculture pond consists of water losses due to evaporation and seepage. Accordingly, the consumptive water use could be 189 ± 1.8 and 218 ± 2.0 cm in a year of culture period which could be equivalent to 18,900 ± 180 and 21,800 ± 200 m3 for a hectare pond in 2013 and 2014, respectively. The consumptive water use was 0.51 cm/d and 0.59 cm/d in 2013 and 2014, respectively, in the present study.
Water use could also be computed in terms of production. Fish production was 6000 ± 300 and 6500 ± 350 kg/ha in these ponds in 2013 and 2014, respectively, in the present study. Accordingly, consumptive water use was 3.15 ± 0.3 m3/kg fish and 3.35 ± 0.2 m3/kg fish in 2013 and 2014, respectively. The total water use in these embankment ponds was 5.15 ± 0.5 m3/kg fish and 5.66 ± 0.6 m3/kg fish in 2013 and 2014, respectively. It is evident that both consumptive and total water use could decrease with an increase in fish production without any negative impact on the environment. The consumptive water use index for channel catfish in Alabama was 3.306 m3/kg fish in 1997 (Boyd 2005).
Conclusion
From the above discussion, it is evident that evaporation and seepage play a vital role so far as water loss is concerned. The rainfall and run-off are slightly higher than the evaporation and seepage in both the years. Thus, the addition of water from the well/canal is very vital to maintain the storage change in the pond. This study also demonstrated that on an average, an amount of 100 cm or 100, 00 m3 of water in a year could be required for the 1.0 ha pond for successful fish culture in the region. The consumptive water use was 3.15 ± 0.3 m3/kg fish and 3.35 ± 0.2 m3/kg fish in 2013 and 2014, respectively, while the total water use in the embankment ponds was 5.15 ± 0.5 m3/kg fish and 5.66 ± 0.6 m3/kg fish in 2013 and 2014, respectively.
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Acknowledgements
The authors are grateful to the Director of ICAR-Central Institute of Freshwater Aquaculture for providing necessary facilities to carry out the present work. The authors are also grateful to Mr. Dilip Badajena for his generous help for carrying out the present study in these ponds.
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Adhikari, S., Pani, K.C. & Jayasankar, P. Water gain and water loss of some freshwater aquaculture ponds at Kausalyaganga, Orissa, India. Appl Water Sci 9, 121 (2019). https://doi.org/10.1007/s13201-019-1001-1
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DOI: https://doi.org/10.1007/s13201-019-1001-1