308 ^^6 Philippine Journal of Science 1915 



being made in this way. By the time the trees are 4.5 meters 

 high all that is necessary to be done is to throw up high dikes 

 or retaining walls, cut out the trees, and adjust the bottom to the 

 required level. 



It should be stated here that it has been learned through 

 observation of the live fish, and through examination of the 

 contents of the digestive tract of these fish, that their food con- 

 sists of various forms of algae (called lumut) and some flowering 

 plants, that will grow in water of about the density of ordinary 

 sea water. 



A few months ago my attention was called to the fact that in 

 Zambales Province difficulties were being encountered in the 

 culture of the baiigos, and an invitation was extended to visit the 

 region in difficulty, with the idea of finding a possible solution. 

 To this end a trip was made to Iba, Zambales. Upon stopping 

 at Subic on the way to Iba, a visit was made to the house of the 

 presidente of the town, with a view to learning about the bangos 

 culture there. The presidente called in one of the large owners 

 of fish ponds, known as Cando, who was questioned concerning 

 his ponds. 



The following is the information collected concerning the 

 various ponds, with occasional comments. 



INFORMATION CONCERNING VARIOUS PONDS 

 SUBIC, POND NO. 1 



The owner, Mr. Cando, is greatly discouraged over the results 

 he obtains at present. He has ponds with an area of about 19.5 

 hectares, which he stocks with 30,000 fry at 50 centavos ^ per 

 1,000. He stocks his ponds in three installments, the remainder 

 of the small fish being kept in a small pond until desired for 

 use. The small fish are placed in the large ponds in May, 

 September, and January, and are removed in August, December, 

 and April. The ponds are emptied of the large fish each time be- 

 fore restocking. All of these fish are of the same age, those for 

 the restocking being kept in a small pond from spawning time 

 until placed in the large pond. Those placed in the large pond 

 in May are very small, but the others are about 10 centimeters 

 long. Forty per cent of the fish placed in the large pond are 

 eaten by fish other than baiiigos, and 30 per cent of the small 

 fish die in the "fry" pond before the transfer. The owner thinks 

 that 60 per cent of his total receipts are lost because of the failure 



' One peso Philippine currency equals 100 centavos, equals 50 cents 

 United States currency. 



