Hi everyone!

For this session, I and Dr. Neill will discuss the experiment result. This is my first experience researching by myself. And guess what? It’s not the same as the expectation. First, I was scared if my research didn’t finish well. But, finally, I made improvisation with the method and my supervisor said my data can be use for my final research project.

                                

And this is the result ….

Summary of research that has been done

On Thursday and Friday (17 to 18 December 2020) I have researched to collect data from 10 tilapia fish. The study had three treatments, namely measuring the target strength (TS) of single value fish, tilapia juxtaposed with small bubbles and tilapia juxtaposed with large bubbles. This study aims to determine how the effect of air bubbles as noise in the measurement of biota strength targets.

 

Initially, take measurements of the length, width, and weight of tilapia first. Then measure the parameters of the research pool consisting of temperature and salinity. Salinity temperature is needed to find the value of the speed of sound in the water. Next, set the SIMRAD EK 15 tool with the following specifications:

 

Pulse duration: 0.08 m / s

Power Simrad EK 15: 46.08 watts

Transducer depth: 0.5 meter

Water temperature: 25 degrees celsius

Speed ​​of sound: 1496.6 m / s

Frequency: 200 kHz

TVG: 40 log r

Reference: -40 dB

Salinity: 0 ppt

Absorption coefficient: 0.007615

Result:

There’s some difference thing between the value of target strength’s tilapia fish and the value with noises. In-display we can see that a big bubble make can offend the result. And I look at the software Echoview the value was different. But still, I have something to ask and discuss with Dr. Neill.

So this is the problems and questions:

• The air pump used is not strong enough to be measured by the rotameter. However, I know that the output produced by the air pump is 2.5 L / minute. To find out more about the output produced by the air pump, research on equipment specifications will be conducted. Do you think Dr. Neill has any other solutions to this?

• It turns out that the display can be read quite clearly and you can see the difference between the control treatment and the treatment combined with the noise. For a solution, I was advised to digitize more than 5000 each ping number on the display. Do you think Dr. Neill is there any other method you can do?

• According to my colleague, it is possible to compare the power used to see the treatment of small and large bubbles. Can it be done?