Fish species difference around the light of metal halide lamps and LED lamps with mini purse seine operation

Abstract

Purse seine (PS) at Lamongan District Indonesia uses lights as a fish attractor. The types of lamp used are a metal halide (MH). This lamp is very bright but has a large electric power so that fuel consumption is also high. Therefore, it is necessary to do research about the use of an LED lamp that is more energy efficient. This study aims to determine the fish species that are in the vicinity of MH lamps compared to LED lamps based on its swimming layer. The study used the experimental method to obtain catch data from both lamp types, and descriptive method to identify fish species composition. The present study found 16 species coming to both types of lamps. It indicates that the LED lamp as a new lamp can attract the same fish species as a MH lamp. The fish species attracted to both light types of lights were dominated by pelagic fish (88.77% and 81.71%) consisting of small pelagic (7 species) and large pelagic fish (4 species), 4 species of demersal fish (7.81% and 13.26%) and 1 species squid of non-fish (3.42% and 5.03%). Small pelagic fish species are plankton feeder and positive phototaxis fish, while big pelagic fish are carnivorous fish that come for much small fish. Demersal fish also caught in the purse seine are those rising to the upper water column at night.