International Journal of Marine Engineering Innovation and Research, Vol. 6(1), Mar. 2021. 65-76 (pISSN: 2541-5972, eISSN: 2548-1479) 65 Test Design of Fish Attractor to Improve Selectivity of Results on Purse Seine Ship Eddy Setyo Koenhardono 1 , Sidratul Nugraha 2 (Received: 19 August 2020 / Revised: 16 March 2021 / Accepted: 17 March 2021) Abstract⎯ Indonesia is a country with abundant potential in the field of fisheries. With this abundant amount of fish, of course, many fishing methods have been developed, such as hunting or following the movement of fish and there are methods that only stay at one point, waiting for a group of fish to approach the gathering point. Fish calling devices that only stay at one point can use sound frequencies. By using the frequency of the sound, the fish will gather at the sound source produced by the fish calling tool, Fish Attractor. This study aims to determine the frequency of sound waves in fish species. The method used in this research is to make a tool that can produce sound waves with adjustable frequency, then the instrument testing will be conducted on fish ponds. Based on the design results, the fish calling device is equipped with an Arduino Uno, LCD, Potentiometer, Speaker, Power Amplifier, and Signal Module. In this Fish Attractor tool, the frequency can be set from 0 Hz – 17,000 Hz. With this adjustable sound frequency, it is expected to attract the attention of fish to get closer to the source of the sound frequency of the fish calling device. Keywords⎯ fish attractor, fish caller, frequency, voice. I. INTRODUCTION 1 As an archipelago, Indonesia is a sea with many small islands and abundant potential fish resources. Based on data from the Indonesia Ministry of Marine Affairs and Ministry, 2017, the total national fishery production reached 23.26 million tons, which consisted of 6.04 million tons of capture fisheries and 17.22 tons of aquaculture. One type of fishing gear that is widely used by Indonesian Fishermen is Purse Seine. Purse Seine is multi-species fishing gear. In fact, in many cases often found nets the size of the net in a very small Purse Seine fishing gear, so that small fish will also be caught. This is the main cause of fishing. In 1995, FAO issued a procedure for fishing activities responsible for the CCRF (Code of Conduct for Responsible Fisheries), in which one of the assessments was the selectivity of fishing gear. According to FAO (1995), selective fishing gear is a fishing gear that catches less than three species of fish [1]. One of the fishing aids that are able to catch selective fish is a fish collecting device based on sound frequency. Fishing aids that can produce certain sounds to attract fish to support the sound source. The use of this tool will be able to overcome the problems that are often experienced by the fishermen of the Purse Seine Ship in the selection of fishing areas and types of fish to be caught [2]. Based on the problem in the paragraph above, the researcher designed a fish calling device called the Fictor. This fishing gear is equipped with a potentiometer to provide the desired sound frequency Eddy Setyo Koenhardono is with Department of Marine Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia. E- mail: eddy-koen@its.ac.id Sidratul Nugraha is with Department of Marine Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia. E-mail: graha91@gmail.com and is equipped with an LCD for monitoring the resulting frequency. This Fictor is expected to be a solution for Purse Seine fishing vessels to increase catchment selectivity. A. Purse Seine Purse Seine or trawl ring is a fishing device from a net that is operated by circling the fish hordes to the bowl-shaped tool at the end of the fishing process. The operation of the trawl ring is to encircle the fish hordes, then the drawstring rope (Purse Seine) is pulled in from the ship to form a net-like bowl. Then the catch is transferred to the ship by using a scoop (see figure 1). Purse Seine is a bag-shaped fishing device equipped with a ring and strap purse line located under the rope which functions to unite the bottom of the net during operations by pulling the purse line so that the net forms a pocket. B. Sound Waves Sound is something that results from vibration. Sound including longitudinal waves that propagate straight in all directions from the source. The conditions for sound occurrence and hearing are : (a) there is a sound source (a vibration object), (b) there is a medium (an intermediate for propagation), (c) there is a sound receiver that is near or within the range of the sound. C. Fish’s Behavior towards Sound Waves Organs in fish that function as hearing devices are lateral lines (lateral linea) and labyrinthine structures. This organ responds to sound from outside through the relative motion of the fluid around the body of the fish. The lateral line is sensitive to the movement of weak water. The lateral line not only senses the subtle movements of the current reflected by an invisible barrier like coral but can also find disturbances caused by hidden prey or attacking enemies. The lateral line also helps the fish to remain in its formation.