Comparison of Periphyton Grown on Different Substrates as Food for Organic Tilapia Culture

dc.contributor.author Milstein, Ana
dc.contributor.author Peretz, Yakov
dc.contributor.author Harpaz, Sheenan
dc.date.accessioned 2012-01-19T20:24:10Z
dc.date.available 2012-01-19T20:24:10Z
dc.date.issued 2008
dc.description.abstract Regulations regarding organic tilapia culture result in increased feed costs. To reduce such costs, experiments were conducted to enhance the natural production of periphyton, on which tilapia feed. Strips of substrates of different textures and colors were placed in the water column of tilapia culture ponds to induce periphyton growth. Some strips were placed in cages to protect them from fish grazing and some where placed in the open pond, accessible to the fish. Periphyton development was evaluated by the contents of chlorophyll, dry matter (DM), and ash free dry matter (organic matter) and by an autotrophic index. The first experiment tested growth on substrates of different textures including natural (palm leaves) and artificial (agricultural nets, plastic surfaces) materials. The second experiment tested the effect of different colored nets. The differences between periphyton grown in cages and in the open pond indicate that tilapia grazed on the periphyton. Palm leaves decomposed too quickly to be of practical use in large- scale aquaculture. Periphytic material seemed to be more easily dislodged from smooth plastic substrates than from rough nets, changing the structure of the residual attached periphyton. Growth was greater on nets with a fine mesh (5.3-9.6 mg/cm2 DM) than with a coarse mesh (3.7- 4.0 mg/cm2 DM) or on smooth plastic surfaces (1.4-2.6 mg/cm2 DM). The color of the substrate did not affect the chlorophyll content of periphyton but did affect its dry and organic matter con- tent. The white substrate had 40% more dry matter (11.5 vs 7.9-8.2 mg/cm2) and 50% more ash free dry matter (2.1 vs 1.4 mg/cm2) than the blue and black substrates.
dc.format.extent 10 pages
dc.identifier.citation Milstein, A., Peretz, Y., & Harpaz, S. (2008). Comparison of Periphyton Grown on Different Substrates as Food for Organic Tilapia Culture. The Israeli Journal of Aquaculture - Bamidgeh, 60(4), 243-252.
dc.identifier.issn 0792-156X
dc.identifier.uri http://hdl.handle.net/10524/19265
dc.publisher Israeli Journal of Aquaculture - BAMIGDEH
dc.relation.ispartofseries The Israeli Journal of Aquaculture - Bamidgeh
dc.subject organic tilapia culture, periphyton-based aquaculture, substrates
dc.subject.lcsh Fish culture--Israel--Periodicals.
dc.subject.lcsh Fish culture--Periodicals.
dc.subject.lcsh Aquaculture--Israel--Periodicals.
dc.subject.lcsh Aquaculture--Periodicals.
dc.title Comparison of Periphyton Grown on Different Substrates as Food for Organic Tilapia Culture
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