Fish Aggregation Pattern on Red-Blue-Green Light Emitting Diode (RGB-LED) Light in Static Lift Net

Sugandi Sugandi,Ronny Irawan Wahju,Mochammad Riyanto,Sumardi Sumardi

doi:10.20884/1.oa.2019.15.1.681

Abstract

The Red-Blue-Green Light Emitting Diode (RGB-LED) light used in the static lift net can manipulate fish behavior to attract, approach and be concentrated in the lighting area. The purpose of this study is to determine the use of the RGB-LED light intensity with pulse width modulation PWM) value for gathering fish and changing patterns of schooling fish’s movement. Seven treatments with changes in PWM values were the initial conditions, 250, 195, 145, 95 20 and 5 PWM. The methods were by using Hydro-acoustic sonar 360o and ImageJ analysis used to determine the schooling fish’s area in horizontal and vertical by dividing the center zone, main zone, influence zone, and shadow zone. Results of the visualization image of schooling fish as the target fish group visualized by horizontally and vertically. It has the longest duration of 90 ' and 250 PWM has a time duration of 10' shows the difference in the area of schooling fish in four zones. 195, 145 and 95 PWM with each time duration of 10' dominant schooling fish were in the main zone and influence zone, the lowest two light intensities of PWM values were 5 and 20, there are three zones namely center zone, main zone, and shadow zone, schooling fish were increasing with movement pattern by revolving the light source at shadow zone. The approached fish were forming schooling fish because they were attracted to light, with changes in the PWM value that can model the movement patterns of schooling fish.

Highlights

RGB-LED light is an innovation of technology development of fish attractor lamp in static lift net (SLN), using a combination of different colors light of Red, Green, and Blue of High Power Led (HPL) with special designed become RGB-LED
Results of the visualization image of schooling fish as the target fish group visualized by horizontally and vertically. It has the longest duration of 90 ' and 250 Pulse Width Modulation (PWM) has a time duration of 10' shows the difference in the area of schooling fish in four zones. 195, 145 and 95 PWM with each time duration of 10' dominant schooling fish were in the main zone and influence zone, the lowest two light intensities of PWM values were 5 and 20, there are three zones namely center zone, main zone, and shadow zone, schooling fish were increasing with movement pattern by revolving the light source at shadow zone
RGB-LED light intensity changes from the maximum to minimum intensity by reducing the PWM value that consists of 250 PWM, 195 PWM, 95 PWM, 20 PWM, and 5 PWM

Summary

Introduction

RGB-LED light is an innovation of technology development of fish attractor lamp in static lift net (SLN), using a combination of different colors light of Red, Green, and Blue of High Power Led (HPL) with special designed become RGB-LED. Green and red light, are stimulated by target catch of lift net and tend to move by approaching the light source (Takahasi et al 2018; Flare et al 2016; Bao 2014). (2012), revealed that by using the colors of blue, yellow, green, red and white from the LEDs produces a difference in fish catch. The success of fishing in SLN is determine from the use of the light intensity level, oceanographic factors and the hauling time (Brown et al, 2016; Ramadan et al, 2018; Palawe et al, 2019)

Objectives

Methods

Results