| Autor: |
Frank H. Meriwether, Wayne Y. Okamura, Edward D. Scura |
| Rok vydání: |
2009 |
| Předmět: |
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| Zdroj: |
Journal of the World Mariculture Society. 15:254-265 |
| ISSN: |
0735-0147 |
| DOI: |
10.1111/j.1749-7345.1984.tb00161.x |
| Popis: |
Feeding trials were conducted in prawn ponds (freshwater) and shrimp ponds (brackishwater) with red tilapia stocked in floating 0.8-m3 cages. Pond sizes ranged from 0.23 to 0.45 ha. Seven ponds were stocked at a density of 26 cages/ha. One hundred 9-9 tilapia fingerlings were stocked into each cage. Fish survival after 8 weeks averaged 98.5% excluding a set of six cages from one pond which was preempted from the study due to high mortality, possibly caused by algal toxins. The growth of caged tilapia fed supplemental diets was significantly (α = .05) higher in brackishwater than in freshwater ponds. Tilapia raised in freshwater cages without supplemental feeding grew at a significantly lower rate than caged fish in any other treatment analyzed. Feed conversion rates were calculated for caged fish grown in fresh water and brackish water. The costs and revenues derived from this polyculture strategy were analyzed. Gross profitha of brackishwater red tilapia cage culture is estimated to be more than double the gross profit obtained in freshwater ponds. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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