Update on High density fish farming (Re-circulating Aquaculture System) experiment at Vigyan ashram. We are working on HD fish farming by adopting RAS system. The trial is started the month of January (2015 with system consisting of Fish tank (Tillapia fish), Bio-filtration bed, Water circulation system (details can be found on- https://vigyanashram.wordpress.com/2015/02/15/recirculating-aquaculture-system-ras- trials-started-at-vigyan-ashram/) The experiment update is as follow- 1. Fish Growth & FCR- Fish growth rate is measured by random sampling with 15 days interval. So far for 2 sampling in last 1.5 month we received 3.4 % average FCR with average fish wt of 34.57 Gm and total tank density of 232.8 Gm / M 3. FCR is pretty high at the point and we are trying and we are expecting to reduce it to 1.5 % for next 4-6 and hope to raise fish density up to 8 to 9 Kg / M 3. Feeding rate is maintained @ 7 – 5 % of body Wt. Feed prepared by using race bran + GOC and soy chunks containing 45 to 48 % protein. Feeding frequency is maintained @ 3 Hr during day time. Meanwhile we have also started harvesting Spinach @ 2.5 KG / week from Bio- filter. (Details on feeding rate, Fish feed formulation and FCR calculation are given in Annexure I ) 2. Water circulation and Water Quality Parameters- Water height in fish tank is maintained @ 0.9 M comprising total tank volume of around 51000 lit. Water circulation system is operated to keep DO level around 7 – 10 PPM and NH 3 level below 5 PPM. Screen filter is added in system to clean fish tank water and avoid micro-sprinkler clogging. Work on developing handy NH 3 testing kit for HD fish farming also started. During fish sampling this is found that bottom layer water in fish tank ( 1 to 1.5 Ft ) is developing anaerobic growth due to heavy accumulation of fish water and feed remaining. This is mainly because we have placed water pump above 1.5 Ft
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Update on High density fish farming (Re-circulating Aquaculture
System) experiment at Vigyan ashram.
We are working on HD fish farming by adopting RAS system. The trial is started the
month of January (2015 with system consisting of Fish tank (Tillapia fish), Bio-filtration
bed, Water circulation system (details can be found on-