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Acceptability of five species of freshwater algae to tilapia (Oreochromis niloticus) fry

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Date
1985
Author
Pantastico, Julia B.
Baldia, Jose P.
Reyes Jr., Deogracias
Page views
3,947
Subject
tilapia culture ASFA
fry ASFA
cultured organisms ASFA
phytoplankton ASFA
acceptance tests ASFA
Algae ASFA
Philippines AGROVOC
tilapia AGROVOC
Oreochromis niloticus AGROVOC
Taxonomic term
Oscillatoria quadripunctulata GBIF
Chroococcus dispersus GBIF
Navicula notha GBIF
Euglena elongata GBIF
Chlorella ellipsoidea GBIF
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Abstract
Unialgal cultures of Oscillatoria quadripunctulata, Chroococcus dispersus, Navicula notha, Euglena elongata, and Chlorella ellipsoidea were fed to tilapia fry for 30 days. Mean weights and survival rates of the fry were highest when given Navicula (105.6 mg, 86%) and Chroococcus (89.1 mg, 90%). Oscillatoria, a filamentous cyanophyte, showed limited acceptability to tilapia fry, possibly because of its larger size in comparison with Chroococcus. Fry fed Chlorella and Euglena did not survive at all.

C14-labeled algae of the above species were fed to tilapia fry of varying ages. Assimilation rates per fry after 24 hours of feeding with a suitable algal species increased with the age of the fry. Moreover, the same trend as in the growth and survival experiments was observed, i.e., the highest assimilation rates were obtained in 40-day old tilapia fry given Navicula and Chroococcus as natural feeds. On the other hand, negligible amounts of the other three algal species tested were assimilated by tilapia fry.

The above results were explained in terms of the enzyme secretion of tilapias. There seemed to be no transition stage in the feeding habit of both fry and adult tilapia. The acceptability of plant matter in the diet of even the early larval stages was demonstrated.
URI
http://hdl.handle.net/10862/254
Suggested Citation
Pantastico, J. B., Baldia, J. P., & Reyes Jr., D. (1985). Acceptability of five species of freshwater algae to tilapia (Oreochromis niloticus) fry. In C. Y. Cho, C. B. Cowey, & T. Watanabe (Eds.), Finfish Nutrition in Asia : Methodological Approaches to Research and Development (pp. 136-144). Ottawa, Canada: International Development Research Centre.
Type
Conference paper
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  • Conference Proceedings [289]

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