Abstract
The present study has been carried out to study the status of primary productivity in relation to physiochemical parameters of the Kadwai reservoir of Ratnagiri district, Maharashtra. The primary productivity was determined by estimating gross and net primary productivity. The experiment was conducted during the monsoon and post monsoon seasons from 1st June to 30th Nov 2015 to know the effect of organic run off on primary production of Kadwai reservoir. The physiochemical parameters such as temperature, pH, dissolved oxygen, total hardness, total alkalinity and transparency ranged from 27oC-30.5oC, 7.5-8.6, 3.2-7.0 mg/l, 46-75 mg/l, 56-95 mg/l, and 118-130 cm, respectively. The gross primary productivity (GPP) during monsoon was 0.07-0.11 gC/m3/hr in June, July and August 2015, respectively, which was very low, whereas GPP were increased during post monsoon season. The values were recorded as 0.12-0.48 gC/m3/hr in the months of September, October, and November 2015, respectively. The results indicated that during monsoon season, organic load is coming along with water in to the reservoir, but phytoplankton growth is minimum due to the heavy rain and flushing rate were high from the downstream of the reservoir. During post monsoon, primary productivity was increased. The results indicate that Kadwai reservoir is more productive during post monsoon season suitable for stocking fish seed.
Highlights
Primary production refers to the amount of organic matter made from inorganic material through the process of photosynthesis[1]
In the present investigation the physicochemical parameters such as temperature, pH, dissolved oxygen, total alkalinity, total hardness and transparency were slightly changed in monsoon and post monsoon season
The temperature, pH, dissolved oxygen, total alkalinity, total hardness and transparency values were ranged from 27oC29oC, 7.5-7.8, 3.2-4.8 mg/l, 76-95 mg/l, 53-75 mg/l, and 125-130 cm, respectively, in monsoon season
Summary
Primary production refers to the amount of organic matter made from inorganic material through the process of photosynthesis[1]. To estimate the total biological activity of reservoir it is necessary to determine the primary production.The study of primary production in lakes and reservoir are essential to understand both water quality and fisheries[4]. The Konkan region of Maharashtra falls under high rainfall zone and large reservoirs area are available for culture based capture fish production[8]. As the chief food of the people in the Konkan region is rice and fish, it enhances the need of freshwater aquaculture in this vicinity. To achieve the need of food as cheap source of animal’s protein from fish, culture based capture fisheries practices could be initiated in Kadwai reservoir. Prior to commence commercial practices of fisheries, it is essential to estimate primary productivity in relation to physico-chemical parameters of Kadwai reservoir. The present study was carried out to measure the changes of primary productivity of Kadwai reservoir in monsoon and post monsoon season for enhancing aquaculture practices, for possible utilization and sustainable management of the Kadwai reservoir
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