310 The Philippine Journal of Science i9i6 



introduce the algse without the larger number of fish), but he is 

 also receiving smaller money returns for greater labor. 



This pond is situated on the bank of a tide river, where there 

 is plenty of algal growth, and the owner transfers about 2 

 cubic meters of the algse from the river to the pond each week, 

 at a cost per week of 60 centavos. This is done from May to 

 September only. The owner thinks that because of the increase 

 of the cost of labor of over 300 per cent, since the construction 

 of this pond, it would not be advisable to make other ponds by 

 excavation. 



From the condition of the bottom of the pond it is seen that no 

 accumulation of mud from the decay of algse or other cause is 

 allowed to form. As the soil throughout this whole region is 

 sandy, it will be observed that by preventing the accumulation of 

 any decayed vegetable matter on the bottom of the pond the 

 bottom will continue to be simply bare sand. 



IBA, POND NO. 2 



Pond No. 2 at Iba belongs to Mr. Pio Acayan. It has an area 

 of about 1.86 hectares. The bottom is largely covered with a 

 thick layer of mud. In a corner of this pond is a smaller one 

 for the fry; it also has a thick layer of mud on the bottom. 

 There is a good growth of algse in both ponds, and it is especially 

 heavy in the smaller. The bottom of this pond, with its inclosed 

 small pond, has not recently been disturbed at the time of taking 

 out the fish, and the algse have not been removed. 



The conditions in this pond are the most satisfactory of any 

 in Iba. The bottom has a thick layer of mud, and the growth of 

 algse is very heavy. The conditions here would seem to contra- 

 dict the idea that sufficient food cannot be obtained for the fish. 

 This is the first pond in Iba where satisfactory food conditions 

 were found to prevail, but because of lack of care in management, 

 poor results were obtained. With proper care this pond should 

 give satisfactory results. Conditions found here contradict 

 the idea of Mr. Jose Venzon that good and sufficient algae will 

 not grow in the ponds in Iba. Mr. Acayan said the algse did not 

 grow well for the first five years after the pond was built, but 

 recently conditions have been much more satisfactory. During 

 the dry season the algse are scarcer and coarser than in the rainy 

 season and are not eaten so well by the fish. About November 

 the algse are poorest, and in December, the dry season, algse begin 

 to grow. These are a little poorer than those of the rainy season. 

 The best algse, the "salt-water algse," are to be found in March. 

 The pond is stocked with fish twice a year : namely, in May and 



