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Undergraduate Special Problem

Permanent URI for this collectionhttps://hdl.handle.net/20.500.14583/30

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    Abundance and composition of the gut contents of orbiculate cardinal fish, Sphaeramia orbicularis (Apogonidae) in Palompon, Leyte
    Canda, Danielle Clare C. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2017-06)
    The study was conducted to examine the gut contents of Sphaeramia orbicularis using specimens from catches of a sled trawl survey conducted from June 2011 to May 2012 in Palompon, Leyte. One hundred seventy-one fish specimens were categorized into six different size classes maintaining an interval of 1 cm: 1-1.9 cm, 2-2.9 cm, 3-3.9 cm, 4-4.9 cm, 5-5.9 cm, and 6-6.9 cm. The guts of the fish specimens were isolated and the contents were placed on a petri dish for identification and counting. Based on the observed percentages of chyme, the species consume a large amount of easily digested materials. The increasing number of prey items as size class increases revealed that the smaller fishes prey on smaller organisms while the larger ones prey on the larger counterpart, and thus smaller predators are a subset of larger predators. Apogonids displayed a generalist diet, consisting mostly of demersal plankton and benthic invertebrates.
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    Composition and abundance of the stomach contents of Caranx melampygus in Nabinbinan Bay, Nueva Valencia, Guimaras
    Caigoy, Mary Johnalynn S. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2015-06)
    Caranx melampygus, a piscivore common in the Indo-Pacific, is an important diurnal predator in coral reefs, but little local information is available on the diet of this fish. This study was done to determine the diet composition and abundance of C. melampygus by examining the stomach contents of specimens collected every 2-4 weeks from catches of fish corals in Southern Guimaras from May 2012 to November 2013. Chyme, fishes, and shrimps were found in the guts of C. melampygus. The Sergestid shrimp Acetes dominated the overall prey composition, followed by penaeid shrimps, and fishes (atherinid, clupeid, engraulid). The mean food count and prey composition varied among small (6-6.9, 7-7.9, 8-8.9), medium (9-9.9, 10-10.9, 1lli.9), and large (12-12.9, 13-13.9, 14-14.9, 15-15.9) fish, suggesting that the food preference of C. melampygus changes as the fish grows.