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A Feasibility Pilot Project For A Method Of Open Water Fish Farming: Final Report
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1972
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Series: OI ; 72-78-1
[PDF-1.59 MB]
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Description:1. The potentials of maricultural activity in moderate to deep ocean water below the turbulent zone are discussed. THe major advantage is the presence of large unused areas of sea floor that are largely non-competitive with other human uses. Uses envisioned are for the development of habitat enchancement areas by use of "plastic grass beds" made of plastic strips, either enclosed by nets or not, the development of herbivore and carnivore trapping areas, algal rope or net culture, and for shellfish culture. 2. An experiment is described in which a 6 x 12.5 meter PVC pipe frame was anchored in 26 meters of water off Oahu, Hawaii, to which were attached 4500 2.5-meter long, 10-cm meter wide strips of two kinds of plastic (polyethylene and olefin) each with a buoyant bubble plastic border which floated the strips more or less vertically in the water. The course of microfloral and faunal establishment on this beed was followed for five months, as was invasion by local fishes. Algal growt quickly (3 weeks) reached maximum standing crop, though the composition of the biota fluctuated constantly throughout the test period. At maximum expression the biota was an incrustation of algal colonies, diatom films, some barely visible foliose and branching colonies, including hydroids, flagellates, minute worms and molluscs, and a large complement of sea hares (Notarchus lineolatus), the largest organisms actually living on the plastic constantly. Heavy grazing both by passing fish and the hares was evident for most of the test period. Fish of 15 species gathered around or in the beds, with the density of grazing scarids and acanthurids increasing throughout the test. Possible economic potentials are discussed.
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Sea Grant Document Number:OCEI-O-72-001
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Rights Information:Public Domain
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