Performance evaluation of a prototype hatching system using African catfish (Clarias gariepinus)eggs

Date

5-2010

Degree

Bachelor of Science in Agricultural Engineering

Major Course

Major in Land & Water Resources Engineering

College

College of Engineering and Agro-Industrial Technology (CEAT)

Adviser/Committee Chair

Aurelio A. Delos Reyes

Committee Member

Rosa A. Delos Reyes, Maurice A. Duka

Abstract

The study evaluated the performance of a prototype hatching system using African catfish (Clarioas gariepinus) eggs in an African Catfish Breeding Farm at Brgy. Uwisan, Calamba City, Laguna. The recirculating prototype hatching system, which is made of locally available materials, is composed of a 138-L plastic drum as rearing tank, 19-mm diameter PVC pipes configured as an airlift pump for circulation, a 6 watt air pump, an inverted 2-liter soft drink bottle and PVC components built as hatching jar, and a gravel bed as biofilter. The effect of egg quantity (8000: 12000: 20000-) on hatching rate was evaluated using a 3x3 Latin Square Design in order to control and evaluate any effects of three identical prototype hatching systems used and the differences in egg quality from three batches or breeding runs. By varying airflow, water flow rates were adjusted depending on the quantity of eggs stocked, and maintained for each egg quantity during the evaluation runs. The hatching performance of the prototype system at 8000 eggs was also compared with the farm's practice of hatching eggs using nylon mats in a flow-through system.Results showed that the three identical prototype systems had no significant effect on hatching rate, suggesting that there was no significant difference in the three systems, or that they operated similarly. Mean hatching rate differed significantly with run or batch of eggs, suggesting that there were indeed differences in egg quality in each batch which involved different broodstocks. On the other hand, there were significant differences in hatching rates at different amounts of eggs. The mean hatching rate at 8000 eggs was highest at 44.18% while the mean hatching rates of 37.41% for 12000 and 20000 eggs, respectively, were not significantly different from each other. Regression analysis showed an inverse relationship (R²=0.4831) between egg quantity and hatching rate.The mean hatching rate of 44.18% in the prototype system at 80000 eggs was significantly much higher compared with that of the flow-through nylon mesh system which had a mean hatching rate of only 12.91%. The overall average hatching rate of 37.42% in the prototype hatching system was nearly three times better than that of the nylon system, indicating the potential of the prototype system in reducing the broodstock requirements to produce a required amount of fry, or in increasing the amount of fry that may be obtained from a given amount of eggs.

Language

English

LC Subject

Clarias gariepinus--Eggs--Incubation, Prototypes--Engineering.

Location

UPLB College of Engineering and Agro-Industrial Technology

Call Number

LG 993.5 2010 A2 T36

Document Type

Thesis

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