Cage culture of Nile tilapia (Tilapia nilotica) without supplemental feeding in an organically enriched pond at three stocking density levels

Date of Publication

1983

Document Type

Master's Thesis

Degree Name

Master of Science in Biology

Subject Categories

Aquaculture and Fisheries

College

College of Science

Department/Unit

Biology

Thesis Adviser

Armando A. Andaya

Defense Panel Chair

Gaudiosa J. Almazan

Defense Panel Member

Tereso Abella
Leonard Pinto, FSC

Abstract/Summary

The effect of stocking density on the production of mixed-sex 120d cage-cultured Tilapia nilotica in a sewage-contaminated and manure-loaded pond without supplemental feeding was investigated. Fingerlings were randomly stocked in 1m3 floating cages at stocking density treatments of 50, 100 and 200 fish/cage, and each treatment replicated thrice. Fish initially stocked at the lowest density level showed the highest individual mean weight increment and growth rate but produced the lowest yield at the end of the 120d test period. Contrastingly, although fingerlings initially caged at the highest stocking density attained the lowest mean gain in weight and growth rate, it yielded the highest biomass at harvest. The functional relation of fish yield (Y) with stocking density was found to be significant (p 0.01), mathematically expressed by the equations Y. Since the experimental fish received no supplemental feeding, its dependence on the natural productivity of the organically-enriched trial pond was assessed. The functional contribution of gross primary production on net fish yield was found significant (p 0.05) only at the lowest stocking density levels. Algal density showed insignificant (p 0.05) correlation with fish yields at all stocking density levels. Inspite of the occasionally stressful limnological condition of the culture medium, physico-chemical parameters monitored were found within the tolerance range of Tilapia nilotica. In all the experimental cages, survival rate was 100 percent.

Abstract Format

html

Language

English

Format

Print

Accession Number

TG01215

Shelf Location

Archives, The Learning Commons, 12F Henry Sy Sr. Hall

Physical Description

95 leaves, 28 cm. ; Typescript

Keywords

Nile tilapia; Fish culture

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