Gonad Rematuration and Reproductive Cycle of the Mud Clam, Anodontia edentula, in Guimaras, Central Philippines Milessa H. Arganoza mhelshuyo@yahoo.com Western Visayas College of Science and Technology Philippines Time: 4:21 – 4:40; October 25, 2012 (Day 2) Venue: Level 3, Hibiscus 3713 Anodondia edentula locally known as imbaw bayi is a commercially important mud clam harvested for human consumption in Central Philippines. Since it is used as a source of food and livelihood to the local gleaners, it was observed that fewer and smaller mud clams have been harvested. Thus, regulating proper collection of this organism and a sound knowledge of its reproductive cycle are necessary. This study aims to describe some aspects of the reproductive biology of A. edentula. Fifty mud clams were collected and dissected every month. Monthly monitoring of the gonadosomatic index in the study shows that A. edentula spawns throughout the year. Under laboratory condition, male has shorter gonadal rematuration than females. Spent male A. edentula that spawned will spawn again after three weeks through serotonin injection while females will spawn gain after six weeks as long as intrinsic and extrinsic factors are met. This type of maturation schedule suggests continuous reproductive competence. Higher spawning rate is obtained in clams reared with mud substrate than without mud substrate but survival rate was found to be higher for clam reared without mud substrate than with mud substrate. Results of this study provide useful information for the management of this bivalve species.
Development and Adoption of Prototype Machines for Organic Fertilizer Production Manuel A. Bajet Jr., Ed.D. manuelbajet@yahoo.com
University of Northern Philippines Heritage City of Vigan, Ilocos Sur
Time: 4:41 – 5:00; October 25, 2012 (Day 2) Venue: Level 3, Hibiscus 3713
The study focused on designing machines for organic fertilizer production Developed machines undergone series of trials to test its performance. Chopping capacity and texture were sued to evaluate the dual powered foliage chopper. On Multi-purpose mechanized chopper, outputs on different trials were analyzed using t-test and on mechanized bio-fertilizer pulverizer performance was evaluated analyses of the data were done using Analysis of Variance (ANOVA). Results showed that motorized dual powered foliage chopper took 8 minutes to chop the Sargassum sp. while on kakawate, it took 6 minutes while the foot powered , it toom 10 and 8 minutes chopping the Sargassum and kakawate leaves respectively. On multi-purpose mechanize chopper using fresh and dried cornstalks, a significant difference was noted between inclined and straight positioning of blades wherein the machine performs better when the blades are inclined. The same result when dried and fresh tobacco stalks and fresh rice hay will be used. However, no significant difference on performance of the machine when chopping bananas, papaya or sugarcane baggaisse. Thus, both the sharpened blade and incline 200 and straight position design on blades of the machine can be utilized. On bio-fertilizer pulverize, inclined blades chipped can pulverized in high speed.
GCEBES 2012 • ISSN: 2094-9529 Marina Bay Sands Expo & Convention Centre, Singapore
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