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Undergraduate Special Problem

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

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AGROVOC Keyword: search.filters.agrovoc.fisheries biologyDepartment: search.filters.department.College of Arts and Sciences

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    Comparative analysis of the gut content of Scylla de Haan, 1833 (Crustacea: Decapoda: Brachyura: Portunidae) collected from the rivers of poblacion Sapian, Capiz
    Bautista, Florey Jane O. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2013-04)
    The natural diet for various sizes and both sexes of the mud crab Scylla sp. collected from the river located at Brgy. Poblacion Sapian Capiz, Philippines was determined. Gut content analysis was conducted for the mud crabs ranging from 30- 109.99 mm carapace width. Results showed that predominant food of mud crab Scylla sp. consists of crustaceans such as shrimps and crabs as well, fish, mollusk, sand shells, unidentified egg, and even plants. Most of the gut content however, consists of chyme due to heavy mastication and presence of the gastric mills that digest the food. There is no ontogenetic shift or difference in the diet as well as diet difference between male and female crabs. The results were discussed in relation with the species’ feeding patterns and the effect of the diet on the maturation of the crab:
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    Analysis of the gut contents of largehead hairtail, Trichiurus lepturus (Linnaeus, 1758) in Surigao Del Sur
    Barros, Andrea Philine R. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2019-06)
    The traditional gut content analysis is one of the methods used which investigates feeding interactions, specifically those belonging to the aquatic food webs. The ribbonfish, Trichiurus lepturus is an economically important fish, and due to its high demand to other south-east Asian countries especially in the Philippines, there is a targeted fishery for this resource. However, the catch of this species in the country has declined recently. Since feeding habits are fundamental to understanding the ecology of a community, this study aimed to analyze the gut contents of Trichiurus lepturus. A total of 66 guts were examined in the study. The size ranged from 101-505 mm in total length. They fed mostly on fishes including Encrasicholina sp., and shrimps such as Acetes, Penaeus, and Lucifer. Moreover, there was an occurrence of cannibalism but only larger individuals. Microplastics were also evident in most of the size classes.