Browsing by Author "Aujero, Eva J."
Nutritional value of five marine phytoplankton species isolated from Philippine water as food for the larvae of Penaeus monodon EJ Aujero, O Millamena, ET Tech & SG Javellana - In GL Rogers, R Day & A Lim (Eds.), Proceedings of the First International Conference on Warm Water Aquaculture-Crustacea, held on the Brigham Young University Hawaii Campus, February 9-11, 1983, 1983 - Brigham Young University Hawaii CampusFeeding experiments were conducted to test the nutritional value of five marine phytoplankton species namely: Chaetoceros calcitrans, Tetrasemis sp., Dunaliella sp., Nannochloris sp. and Chlorella sp. isolated from panay , Philippines to the larvae of Penaeus monodon from nauplius to Mysis. Proximate analyses and determination fatty acid composition were made on the larvae were directly related to the level of Polyunsaturated fatty acids in the legal diets. Best results were obtained with Chaetoceros calcitrans, Tetraselmis sp. and Dunaliella sp as food.
Paralytic shellfish poisoning due to Pyrodinium bahamense var. compressa in Mati, Davao Oriental, Philippines On 26 August 1983, a single case of paralytic shellfish-poisoning (PSP) was reported in Davao City, Philippines. The poisoning was traced to ingestion of the green mussel Perna viridis Linnaeus, gathered from Balete Bay, Mati, Davao Oriental. Phytoplankton and zooplankton analyses on 12 October 1983 (47 d later), revealed the presence of the dinoflagellate Pyrodinium bahamense var. compressa, a cause of a series of red tides in the early and middle 1970's in Papua New Guinea, Sabah, and Brunei, and more recently, in Palau, and Western Samar and Leyte, Philippines. The dinoflagellate was not dominant; in fact the enumeration showed greater numbers of Ceratium sp., another dinoflagellate. Quantification of the neurotoxin by the standard mouse assay revealed a very high potency. Mussels collected from a new raft (transplanted in May 1983) had a toxicity of 7 960 mouse units (MU) per 100 g-1 meat. Those from an old raft (transplanted in May 1982) had a toxicity of 9 620 MU per 100 g-1 meat.
ArticleA method of algae harvesting and preservation was developed. Test algal species consisted of two diatoms: Chaetoceros calcitrans and Skeletonema costatum, and two flagellates: Tetraselmis chui and Isochrysis galbana. Chemical flocculation using alum and lime were evaluated as methods of harvesting algae. Freezing and sun-drying were used as methods of preservation with viability tests done on frozen samples. The usefulness of sun-dried algae was evaluated through its ability to support survival of Penaeus menodon larvae. Results showed that alum and lime flocculation were effective for Chaetoceros, Tetraselmis and Skeletonema but ineffective for Isochrysis. Optimum pH for algae removal with alum was found to be 6.5. With lime, algae removals increased with pH and was optimum at pH 9.5. A simple freezing technique preserves the viability of algal concentrates for culture purposes. Good performance of sun-dried Chaetoceros and Tetraselnlis suggests that these algae may be used as larval feed for Penaens monodon alone or supplementarily to eliminate complete dependence on carefully-timed live algal production.