report of the national consultative meeting on aquaculture engineering

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Produced by: Fisheries and Aquaculture Department Title: Report of the Nat ional Consultative Meet ing on Aquaculture Engineering 2 –5 ... II. CONTRIBUTED P APERS (Contd.)  AS/AE-CM/ 85/CP-7 RECOMMENDED DESIGN FOR FISHPENS AND FISHCAGES UNDER THE LAGUNA DE BAY FISHPEN DEVELOPMENT PROJECT OF THE LAGUNA LAKE DEVELOPMENT AUTHORITY by Armando E. Misagal 1 ABSTRACT The Laguna Lake Development Authority (LLDA) is implementing a $14.5M ADB-OPEC assisted Laguna de Bay Fishpen Development Project (LBFDP) which seeks to improve the socio-economic conditions of fishermen around the lake, ensure a continuous supply of fish in the Lage Region and improve the technology of the fishing industry. The LBFDP has two major components: the development of some 1 680 ha fishpen modules and the construction of a hatchery-nursery facility that will support the fingerling requirements of the fishpen modules completed.  Actual construction of fishpens and fish cages is going on at thi s writing while, the construction o f the hatchery- facility is slated to start in the latter part of 1985. Construction of fishpens and fish cages proceeded according to recommended designs, which consisted of bamboo poles and anahaw trunks for framework and polyethelene and polyester materials for netting. The structural efficiency of the recommended designs cannot be assessed at the moment, because few fishpen modules have just been completed and which still have to be tested against the pressure generated by typhoons. 1. BACKGROUND Laguna Lake is the largest freshwater lake in the country. It has a surface area of 90 000 hectares (900 square kilometers), at average lake level, a depth of 2.80 meters and a shoreline of about 220 kilometers. Wa ter in the lake is being supplied by direct precipitation, tributary rivers and streams, surface run-off, springs and underground water inflows. Studies made by LLDA consultants on the available meteoro logical data, showed that the local mean annual net inflow of water to the lake is about 3 000 million cubic meters or 95 m 3 /sec. The economic viability of fishpens was first shown by the Laguna Lake Development Authority (LLDA), when it enclosed a 38-ha shallow cove in Barangay Looc, Cardon a, Rizal in July 1970. It was stocked with 150 000 bangos fingerlings and after six months of culture period harvest was effected. The resulting harvest was very encouraging and promising. It showed that milkfish can be successfully cultured in Laguna Lake and more importantly, it can subsist solely on the natural food supply in the Lake. It also showed that in fishpens, an average annual production of 4 000 kilograms per ha can be achieved as compared to only 900 kilograms per ha in fishponds and 300 kilograms per ha in open water. Repor t of the Natio nal Consul tat ive Mee ting on Aquac ult ure ... htt p:/ /www.fao.o rg/ doc rep /fi eld /003/AC414E/ AC414E03. htm 1 of 43 10/24/2014 01:39 PM

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Page 1: Report of the National Consultative Meeting on Aquaculture Engineering

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