Spatial characteristics of fish distribution lured by artificial reefs in Jeju marine ranching area

Abstract

Hydro-acoustic survey was carried out to investigate the spatial characteristics of fish distribution near two artificial reefs (AO: large octagonal semi-sphere and AC: combined custom built) having different types in Jeju marine ranching area. The survey system consisted of scientific echo sounder (EK60), DGPS system, and ECDIS (Mecys). Field survey was conducted on August and October 2012 with star survey and line transect survey line method, and species composition was investigated from gill net fishing survey. The acoustic signals from individual fishes and small fish schools were mainly recorded around AO, but large and strong signals from large fish school were mainly detected in the top layer of and the water column near AC. The echogram suggest that the fish aggregation for the two types of AO and AC exist the significant difference in fish species and spatial distribution pattern.

Seasonal Variations in the Species Composition of Fisheries Resources Caught by Trammel Net in the Uljin Marine Ranching Area, East Sea

“…, (Sebastes schlegelii), (Hexagrammos otakii) (Platichthys stellatus), (Paralichthys olivaceus) (MIFFAF, 2008;2009). , (Hwang et al, 2004), (Edgar and Barrett, 1997;Guidetti et al, 2002;Akamatus et al, 2003;Oh et al, 2010), (Kang et al, 2008; , (Lee and Kang, 1994;Hwang and Jang, 2014) .…”

“…, (Lee and Kang, 1994;Yim, 2005;Hwang and Jang, 2014;Hwang et al, 2015). , Hwang and Kim, 2003;Ko et al, 2012 (Park et al, 2007;MIFFAF, 2008) .…”