A review of the fisheries in Philippine lakes and reservoirs

Baluyut, E. A. (1982) A review of the fisheries in Philippine lakes and reservoirs. (Submitted)

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Abstract

The 220,000 hectares of lakes and reservoirs in the Philippines constitute a vital fishery resource with great potentials for development. These inland waters, which have traditionally contributed only minimally to the total fish production effort, have been making increasingly greater impacts on the national economy, mainly as a results of the introduction of high-yielding species like tilapia, milkfish and carp. In the 90,000 hectares Laguna de Bay, annual fish production from the open waters was about 16,800 m t in 1979, equivalent to an average production of 210 kg/ha/yr. This is exclusive of the aquaculture production in pens and cages which would be at least 56,000 m t/ha/yr from about 7,000 hectares of fish pens. In Lake Buluan (6,000 hectares), another shallow, eutrophic lake, annual fish production is about 10,000 m t or 1,600 kg.ha.yr, probably the highest in the ASEAN region. In contrast, the deeper, oligatotrophic lakes like Lanao and Mainit in southern Philippines have poor yields of 4.9 and 9.5 kg/ha/yr, respectively. A large fraction of the fish production could be attributed to the catches of introduced species notably milkfish, tilapia and carp. In Laguna de Bay, milkfish comprised 16% of the total open water catch 1979. In Lanao and Buluan, carp constituted a significant portion of the catch. In Pantabangan Reservoir, the country's largest man-made lake, there are evidence of successful establishment of tilapia, milkfish and carp. Not a introductions have been advantages, however. The near-extinction of the 'sinarapan' (Mistichthys luzonensis) in Lake Buhi and of some endemic cyprinids in Lake Lanao, and the complete destruction of the indigenous fishery in Caliraya Reservoir constitute concrete proof that fish stoking can be risky and dangerous. At the same time, these cases serve to remind fishery managers of the need for a through study of the environment and the fish fauna as a prerequisite to planning and development. Author's abstract.

Item Type: Article
Depositing User: eLib Admin
Date Deposited: 20 Jun 2017 13:17
Last Modified: 24 Jun 2017 23:20
URI: http://lib.mainit.org/id/eprint/21

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