k = 



Ing the fish have to be conslde^red. The size of a spawning 

 pond Is 12 -metres wldq and' 20 metres long, while that of a 

 stockihg pond Is 2 to ij. times as big. The,. appropriate -size cf 

 a nursery pond is 5 metres .wide and 10, metres long. The 

 depth of water should be maintained, nofless' than 1 "metre* 



It should also be' bom Inmlnd that each fish-pond should 

 be made with b&rm, and .provided with one or more feed^^^^i, 

 boards placed about I5 centimetres beneath the water,' and 

 provided with 2. sheds, or more 'if' necessary, made o-f' thatch 

 and erectf'^d above the .feeding, boards. Beside these, Ipomea 

 are planted, and should occupy- not more than three-fourth the 

 area of each pond. -The" inlet and' outlet of the pond .should 

 be guarded, with finely meshed ■ screens. 



In -order to .increase the rapid growth- of Ipomea and the 

 production of microscopic organisms as natural food' in ponds, 

 •dried cattle or buffalo manure is scattered along the water 

 'line every 5 weeks with the. pr-porti'm of 1+0 ^iti?es ' foj? 100 

 square metres of water area,- 



Re gar ding,;- the amount of fish to be punt into the ponds, 

 the department adopts the following proportl-ens: 2^ pairs of 

 spawners are for lOO .square metres qf water area; for every 

 1 .-square metre of water area are 10 fishes, of. more than. 

 10 centimetres in length; or 20 fishes, of 5 to id centi- 

 metres in. lejigth; or .i|0. fishes , of less than, 5 centimetres 

 in length. 



.FEEDING . 



It Is ,found that waterfleas, Moina sp ., and cSpepods are' 

 taken by the fry. These minute crustacqans- are then raised- 

 separately and. given to the fry yfeen they;:are 7 to. 50 days 

 old. -"After this period, cooked rice-bran, mixed .with cooked 

 Ipomea or duei^weed, is prepared -and made Iri. lumps. One .lump 

 is placed on each feeding board. To train the fish,' food is 



